* libbfd-in.h (bfd_malloc2, bfd_realloc2, bfd_zmalloc2, bfd_alloc2,

	bfd_zalloc2): New prototypes.
	* bfd-in.h (HALF_BFD_SIZE_TYPE): Define.
	* libbfd.c (bfd_malloc2, bfd_realloc2, bfd_zmalloc2): New functions.
	* opncls.c (bfd_alloc2, bfd_zalloc2): New functions.
	* elf.c (bfd_elf_get_elf_syms, setup_group, assign_section_numbers,
	elf_map_symbols, map_sections_to_segments,
	assign_file_positions_for_segments, copy_private_bfd_data,
	swap_out_syms, _bfd_elf_slurp_version_tables): Use bfd_*alloc2
	where appropriate.
	* bfd-in2.h: Rebuilt.
	* libbfd.h: Rebuilt.

	* elf.c (_bfd_elf_print_private_bfd_data): Don't crash on bogus
	verdef or verneed section.
	(_bfd_elf_slurp_version_tables): Handle corrupt verdef and/or
	verneed sections gracefully.
	* elfxx-sparc.c (_bfd_sparc_elf_info_to_howto_ptr): Don't crash on
	bogus relocation values.
	* elf64-ppc.c (ppc64_elf_info_to_howto): Likewise.
	* elf64-s390.c (elf_s390_info_to_howto): Likewise.
	* elf32-s390.c (elf_s390_info_to_howto): Likewise.
	* elf64-x86-64.c (elf64_x86_64_info_to_howto): Likewise.
	* elfxx-ia64.c (lookup_howto): Likewise.

1 files changed, 119 insertions, 57 deletions

diff --git a/bfd/elf.c b/bfd/elf.c
index 4470744..130ec7a 100644
--- a/bfd/elf.c
+++ b/bfd/elf.c
@@ -340,7 +340,7 @@ bfd_elf_get_elf_syms (bfd *ibfd,
   pos = symtab_hdr->sh_offset + symoffset * extsym_size;
   if (extsym_buf == NULL)
     {
-      alloc_ext = bfd_malloc (amt);
+      alloc_ext = bfd_malloc2 (symcount, extsym_size);
       extsym_buf = alloc_ext;
     }
   if (extsym_buf == NULL
@@ -359,7 +359,8 @@ bfd_elf_get_elf_syms (bfd *ibfd,
       pos = shndx_hdr->sh_offset + symoffset * sizeof (Elf_External_Sym_Shndx);
       if (extshndx_buf == NULL)
 	{
-	  alloc_extshndx = bfd_malloc (amt);
+	  alloc_extshndx = bfd_malloc2 (symcount,
+					sizeof (Elf_External_Sym_Shndx));
 	  extshndx_buf = alloc_extshndx;
 	}
       if (extshndx_buf == NULL
@@ -373,8 +374,7 @@ bfd_elf_get_elf_syms (bfd *ibfd,
 
   if (intsym_buf == NULL)
     {
-      bfd_size_type amt = symcount * sizeof (Elf_Internal_Sym);
-      intsym_buf = bfd_malloc (amt);
+      intsym_buf = bfd_malloc2 (symcount, sizeof (Elf_Internal_Sym));
       if (intsym_buf == NULL)
 	goto out;
     }
@@ -494,10 +494,10 @@ setup_group (bfd *abfd, Elf_Internal_Shdr *hdr, asection *newsect)
 	  /* We keep a list of elf section headers for group sections,
 	     so we can find them quickly.  */
 	  bfd_size_type amt;
-	  
+
 	  elf_tdata (abfd)->num_group = num_group;
-	  amt = num_group * sizeof (Elf_Internal_Shdr *);
-	  elf_tdata (abfd)->group_sect_ptr = bfd_alloc (abfd, amt);
+	  elf_tdata (abfd)->group_sect_ptr
+	    = bfd_alloc2 (abfd, num_group, sizeof (Elf_Internal_Shdr *));
 	  if (elf_tdata (abfd)->group_sect_ptr == NULL)
 	    return FALSE;
 
@@ -517,7 +517,8 @@ setup_group (bfd *abfd, Elf_Internal_Shdr *hdr, asection *newsect)
 		  /* Read the raw contents.  */
 		  BFD_ASSERT (sizeof (*dest) >= 4);
 		  amt = shdr->sh_size * sizeof (*dest) / 4;
-		  shdr->contents = bfd_alloc (abfd, amt);
+		  shdr->contents = bfd_alloc2 (abfd, shdr->sh_size,
+					       sizeof (*dest) / 4);
 		  if (shdr->contents == NULL
 		      || bfd_seek (abfd, shdr->sh_offset, SEEK_SET) != 0
 		      || (bfd_bread (shdr->contents, shdr->sh_size, abfd)
@@ -1219,8 +1220,9 @@ _bfd_elf_print_private_bfd_data (bfd *abfd, void *farg)
       for (t = elf_tdata (abfd)->verdef; t != NULL; t = t->vd_nextdef)
 	{
 	  fprintf (f, "%d 0x%2.2x 0x%8.8lx %s\n", t->vd_ndx,
-		   t->vd_flags, t->vd_hash, t->vd_nodename);
-	  if (t->vd_auxptr->vda_nextptr != NULL)
+		   t->vd_flags, t->vd_hash,
+		   t->vd_nodename ? t->vd_nodename : "<corrupt>");
+	  if (t->vd_auxptr != NULL && t->vd_auxptr->vda_nextptr != NULL)
 	    {
 	      Elf_Internal_Verdaux *a;
 
@@ -1228,7 +1230,8 @@ _bfd_elf_print_private_bfd_data (bfd *abfd, void *farg)
 	      for (a = t->vd_auxptr->vda_nextptr;
 		   a != NULL;
 		   a = a->vda_nextptr)
-		fprintf (f, "%s ", a->vda_nodename);
+		fprintf (f, "%s ",
+			 a->vda_nodename ? a->vda_nodename : "<corrupt>");
 	      fprintf (f, "\n");
 	    }
 	}
@@ -1243,10 +1246,12 @@ _bfd_elf_print_private_bfd_data (bfd *abfd, void *farg)
 	{
 	  Elf_Internal_Vernaux *a;
 
-	  fprintf (f, _("  required from %s:\n"), t->vn_filename);
+	  fprintf (f, _("  required from %s:\n"),
+		   t->vn_filename ? t->vn_filename : "<corrupt>");
 	  for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
 	    fprintf (f, "    0x%8.8lx 0x%2.2x %2.2d %s\n", a->vna_hash,
-		     a->vna_flags, a->vna_other, a->vna_nodename);
+		     a->vna_flags, a->vna_other,
+		     a->vna_nodename ? a->vna_nodename : "<corrupt>");
 	}
     }
 
@@ -2883,7 +2888,6 @@ assign_section_numbers (bfd *abfd, struct bfd_link_info *link_info)
   asection *sec;
   unsigned int section_number, secn;
   Elf_Internal_Shdr **i_shdrp;
-  bfd_size_type amt;
   struct bfd_elf_section_data *d;
 
   section_number = 1;
@@ -2987,13 +2991,11 @@ assign_section_numbers (bfd *abfd, struct bfd_link_info *link_info)
 
   /* Set up the list of section header pointers, in agreement with the
      indices.  */
-  amt = section_number * sizeof (Elf_Internal_Shdr *);
-  i_shdrp = bfd_zalloc (abfd, amt);
+  i_shdrp = bfd_zalloc2 (abfd, section_number, sizeof (Elf_Internal_Shdr *));
   if (i_shdrp == NULL)
     return FALSE;
 
-  amt = sizeof (Elf_Internal_Shdr);
-  i_shdrp[0] = bfd_zalloc (abfd, amt);
+  i_shdrp[0] = bfd_zalloc (abfd, sizeof (Elf_Internal_Shdr));
   if (i_shdrp[0] == NULL)
     {
       bfd_release (abfd, i_shdrp);
@@ -3244,7 +3246,6 @@ elf_map_symbols (bfd *abfd)
   unsigned int idx;
   asection *asect;
   asymbol **new_syms;
-  bfd_size_type amt;
 
 #ifdef DEBUG
   fprintf (stderr, "elf_map_symbols\n");
@@ -3258,8 +3259,7 @@ elf_map_symbols (bfd *abfd)
     }
 
   max_index++;
-  amt = max_index * sizeof (asymbol *);
-  sect_syms = bfd_zalloc (abfd, amt);
+  sect_syms = bfd_zalloc2 (abfd, max_index, sizeof (asymbol *));
   if (sect_syms == NULL)
     return FALSE;
   elf_section_syms (abfd) = sect_syms;
@@ -3332,8 +3332,7 @@ elf_map_symbols (bfd *abfd)
     }
 
   /* Now sort the symbols so the local symbols are first.  */
-  amt = (num_locals + num_globals) * sizeof (asymbol *);
-  new_syms = bfd_alloc (abfd, amt);
+  new_syms = bfd_alloc2 (abfd, num_locals + num_globals, sizeof (asymbol *));
 
   if (new_syms == NULL)
     return FALSE;
@@ -3592,8 +3591,7 @@ map_sections_to_segments (bfd *abfd)
 
   /* Select the allocated sections, and sort them.  */
 
-  amt = bfd_count_sections (abfd) * sizeof (asection *);
-  sections = bfd_malloc (amt);
+  sections = bfd_malloc2 (bfd_count_sections (abfd), sizeof (asection *));
   if (sections == NULL)
     goto error_return;
 
@@ -4025,7 +4023,6 @@ assign_file_positions_for_segments (bfd *abfd, struct bfd_link_info *link_info)
   bfd_vma filehdr_vaddr, filehdr_paddr;
   bfd_vma phdrs_vaddr, phdrs_paddr;
   Elf_Internal_Phdr *p;
-  bfd_size_type amt;
 
   if (elf_tdata (abfd)->segment_map == NULL)
     {
@@ -4100,8 +4097,7 @@ assign_file_positions_for_segments (bfd *abfd, struct bfd_link_info *link_info)
   if (alloc == 0)
     alloc = count;
 
-  amt = alloc * sizeof (Elf_Internal_Phdr);
-  phdrs = bfd_alloc (abfd, amt);
+  phdrs = bfd_alloc2 (abfd, alloc, sizeof (Elf_Internal_Phdr));
   if (phdrs == NULL)
     return FALSE;
 
@@ -5361,8 +5357,7 @@ copy_private_bfd_data (bfd *ibfd, bfd *obfd)
 
       /* Gcc 2.96 miscompiles this code on mips. Don't do casting here
 	 to work around this long long bug.  */
-      amt = section_count * sizeof (asection *);
-      sections = bfd_malloc (amt);
+      sections = bfd_malloc2 (section_count, sizeof (asection *));
       if (sections == NULL)
 	return FALSE;
 
@@ -5784,8 +5779,7 @@ swap_out_syms (bfd *abfd,
   symstrtab_hdr = &elf_tdata (abfd)->strtab_hdr;
   symstrtab_hdr->sh_type = SHT_STRTAB;
 
-  amt = (bfd_size_type) (1 + symcount) * bed->s->sizeof_sym;
-  outbound_syms = bfd_alloc (abfd, amt);
+  outbound_syms = bfd_alloc2 (abfd, 1 + symcount, bed->s->sizeof_sym);
   if (outbound_syms == NULL)
     {
       _bfd_stringtab_free (stt);
@@ -5798,7 +5792,8 @@ swap_out_syms (bfd *abfd,
   if (symtab_shndx_hdr->sh_name != 0)
     {
       amt = (bfd_size_type) (1 + symcount) * sizeof (Elf_External_Sym_Shndx);
-      outbound_shndx = bfd_zalloc (abfd, amt);
+      outbound_shndx = bfd_zalloc2 (abfd, 1 + symcount,
+				    sizeof (Elf_External_Sym_Shndx));
       if (outbound_shndx == NULL)
 	{
 	  _bfd_stringtab_free (stt);
@@ -6211,7 +6206,6 @@ bfd_boolean
 _bfd_elf_slurp_version_tables (bfd *abfd, bfd_boolean default_imported_symver)
 {
   bfd_byte *contents = NULL;
-  bfd_size_type amt;
   unsigned int freeidx = 0;
 
   if (elf_dynverref (abfd) != 0)
@@ -6220,11 +6214,12 @@ _bfd_elf_slurp_version_tables (bfd *abfd, bfd_boolean default_imported_symver)
       Elf_External_Verneed *everneed;
       Elf_Internal_Verneed *iverneed;
       unsigned int i;
+      bfd_byte *contents_end;
 
       hdr = &elf_tdata (abfd)->dynverref_hdr;
 
-      amt = (bfd_size_type) hdr->sh_info * sizeof (Elf_Internal_Verneed);
-      elf_tdata (abfd)->verref = bfd_zalloc (abfd, amt);
+      elf_tdata (abfd)->verref = bfd_zalloc2 (abfd, hdr->sh_info,
+					      sizeof (Elf_Internal_Verneed));
       if (elf_tdata (abfd)->verref == NULL)
 	goto error_return;
 
@@ -6232,11 +6227,22 @@ _bfd_elf_slurp_version_tables (bfd *abfd, bfd_boolean default_imported_symver)
 
       contents = bfd_malloc (hdr->sh_size);
       if (contents == NULL)
-	goto error_return;
+	{
+error_return_verref:
+	  elf_tdata (abfd)->verref = NULL;
+	  elf_tdata (abfd)->cverrefs = 0;
+	  goto error_return;
+	}
       if (bfd_seek (abfd, hdr->sh_offset, SEEK_SET) != 0
 	  || bfd_bread (contents, hdr->sh_size, abfd) != hdr->sh_size)
-	goto error_return;
+	goto error_return_verref;
 
+      if (hdr->sh_info && hdr->sh_size < sizeof (Elf_External_Verneed))
+	goto error_return_verref;
+
+      BFD_ASSERT (sizeof (Elf_External_Verneed)
+		  == sizeof (Elf_External_Vernaux));
+      contents_end = contents + hdr->sh_size - sizeof (Elf_External_Verneed);
       everneed = (Elf_External_Verneed *) contents;
       iverneed = elf_tdata (abfd)->verref;
       for (i = 0; i < hdr->sh_info; i++, iverneed++)
@@ -6253,11 +6259,21 @@ _bfd_elf_slurp_version_tables (bfd *abfd, bfd_boolean default_imported_symver)
 	    bfd_elf_string_from_elf_section (abfd, hdr->sh_link,
 					     iverneed->vn_file);
 	  if (iverneed->vn_filename == NULL)
-	    goto error_return;
+	    goto error_return_verref;
 
-	  amt = iverneed->vn_cnt;
-	  amt *= sizeof (Elf_Internal_Vernaux);
-	  iverneed->vn_auxptr = bfd_alloc (abfd, amt);
+	  if (iverneed->vn_cnt == 0)
+	    iverneed->vn_auxptr = NULL;
+	  else
+	    {
+	      iverneed->vn_auxptr = bfd_alloc2 (abfd, iverneed->vn_cnt,
+						sizeof (Elf_Internal_Vernaux));
+	      if (iverneed->vn_auxptr == NULL)
+		goto error_return_verref;
+	    }
+
+	  if (iverneed->vn_aux
+	      > (size_t) (contents_end - (bfd_byte *) everneed))
+	    goto error_return_verref;
 
 	  evernaux = ((Elf_External_Vernaux *)
 		      ((bfd_byte *) everneed + iverneed->vn_aux));
@@ -6270,13 +6286,17 @@ _bfd_elf_slurp_version_tables (bfd *abfd, bfd_boolean default_imported_symver)
 		bfd_elf_string_from_elf_section (abfd, hdr->sh_link,
 						 ivernaux->vna_name);
 	      if (ivernaux->vna_nodename == NULL)
-		goto error_return;
+		goto error_return_verref;
 
 	      if (j + 1 < iverneed->vn_cnt)
 		ivernaux->vna_nextptr = ivernaux + 1;
 	      else
 		ivernaux->vna_nextptr = NULL;
 
+	      if (ivernaux->vna_next
+		  > (size_t) (contents_end - (bfd_byte *) evernaux))
+		goto error_return_verref;
+
 	      evernaux = ((Elf_External_Vernaux *)
 			  ((bfd_byte *) evernaux + ivernaux->vna_next));
 
@@ -6289,6 +6309,10 @@ _bfd_elf_slurp_version_tables (bfd *abfd, bfd_boolean default_imported_symver)
 	  else
 	    iverneed->vn_nextref = NULL;
 
+	  if (iverneed->vn_next
+	      > (size_t) (contents_end - (bfd_byte *) everneed))
+	    goto error_return_verref;
+
 	  everneed = ((Elf_External_Verneed *)
 		      ((bfd_byte *) everneed + iverneed->vn_next));
 	}
@@ -6306,6 +6330,7 @@ _bfd_elf_slurp_version_tables (bfd *abfd, bfd_boolean default_imported_symver)
       Elf_Internal_Verdef iverdefmem;
       unsigned int i;
       unsigned int maxidx;
+      bfd_byte *contents_end_def, *contents_end_aux;
 
       hdr = &elf_tdata (abfd)->dynverdef_hdr;
 
@@ -6316,6 +6341,16 @@ _bfd_elf_slurp_version_tables (bfd *abfd, bfd_boolean default_imported_symver)
 	  || bfd_bread (contents, hdr->sh_size, abfd) != hdr->sh_size)
 	goto error_return;
 
+      if (hdr->sh_info && hdr->sh_size < sizeof (Elf_External_Verdef))
+	goto error_return;
+
+      BFD_ASSERT (sizeof (Elf_External_Verdef)
+		  >= sizeof (Elf_External_Verdaux));
+      contents_end_def = contents + hdr->sh_size
+			 - sizeof (Elf_External_Verdef);
+      contents_end_aux = contents + hdr->sh_size
+			 - sizeof (Elf_External_Verdaux);
+
       /* We know the number of entries in the section but not the maximum
 	 index.  Therefore we have to run through all entries and find
 	 the maximum.  */
@@ -6328,6 +6363,10 @@ _bfd_elf_slurp_version_tables (bfd *abfd, bfd_boolean default_imported_symver)
 	  if ((iverdefmem.vd_ndx & ((unsigned) VERSYM_VERSION)) > maxidx)
 	    maxidx = iverdefmem.vd_ndx & ((unsigned) VERSYM_VERSION);
 
+	  if (iverdefmem.vd_next
+	      > (size_t) (contents_end_def - (bfd_byte *) everdef))
+	    goto error_return;
+
 	  everdef = ((Elf_External_Verdef *)
 		     ((bfd_byte *) everdef + iverdefmem.vd_next));
 	}
@@ -6339,8 +6378,8 @@ _bfd_elf_slurp_version_tables (bfd *abfd, bfd_boolean default_imported_symver)
 	  else
 	    freeidx = ++maxidx;
 	}
-      amt = (bfd_size_type) maxidx * sizeof (Elf_Internal_Verdef);
-      elf_tdata (abfd)->verdef = bfd_zalloc (abfd, amt);
+      elf_tdata (abfd)->verdef = bfd_zalloc2 (abfd, maxidx,
+					      sizeof (Elf_Internal_Verdef));
       if (elf_tdata (abfd)->verdef == NULL)
 	goto error_return;
 
@@ -6356,15 +6395,32 @@ _bfd_elf_slurp_version_tables (bfd *abfd, bfd_boolean default_imported_symver)
 
 	  _bfd_elf_swap_verdef_in (abfd, everdef, &iverdefmem);
 
+	  if ((iverdefmem.vd_ndx & VERSYM_VERSION) == 0)
+	    {
+error_return_verdef:
+	      elf_tdata (abfd)->verdef = NULL;
+	      elf_tdata (abfd)->cverdefs = 0;
+	      goto error_return;
+	    }
+
 	  iverdef = &iverdefarr[(iverdefmem.vd_ndx & VERSYM_VERSION) - 1];
 	  memcpy (iverdef, &iverdefmem, sizeof (Elf_Internal_Verdef));
 
 	  iverdef->vd_bfd = abfd;
 
-	  amt = (bfd_size_type) iverdef->vd_cnt * sizeof (Elf_Internal_Verdaux);
-	  iverdef->vd_auxptr = bfd_alloc (abfd, amt);
-	  if (iverdef->vd_auxptr == NULL)
-	    goto error_return;
+	  if (iverdef->vd_cnt == 0)
+	    iverdef->vd_auxptr = NULL;
+	  else
+	    {
+	      iverdef->vd_auxptr = bfd_alloc2 (abfd, iverdef->vd_cnt,
+					       sizeof (Elf_Internal_Verdaux));
+	      if (iverdef->vd_auxptr == NULL)
+		goto error_return_verdef;
+	    }
+
+	  if (iverdef->vd_aux
+	      > (size_t) (contents_end_aux - (bfd_byte *) everdef))
+	    goto error_return_verdef;
 
 	  everdaux = ((Elf_External_Verdaux *)
 		      ((bfd_byte *) everdef + iverdef->vd_aux));
@@ -6377,20 +6433,25 @@ _bfd_elf_slurp_version_tables (bfd *abfd, bfd_boolean default_imported_symver)
 		bfd_elf_string_from_elf_section (abfd, hdr->sh_link,
 						 iverdaux->vda_name);
 	      if (iverdaux->vda_nodename == NULL)
-		goto error_return;
+		goto error_return_verdef;
 
 	      if (j + 1 < iverdef->vd_cnt)
 		iverdaux->vda_nextptr = iverdaux + 1;
 	      else
 		iverdaux->vda_nextptr = NULL;
 
+	      if (iverdaux->vda_next
+		  > (size_t) (contents_end_aux - (bfd_byte *) everdaux))
+		goto error_return_verdef;
+
 	      everdaux = ((Elf_External_Verdaux *)
 			  ((bfd_byte *) everdaux + iverdaux->vda_next));
 	    }
 
-	  iverdef->vd_nodename = iverdef->vd_auxptr->vda_nodename;
+	  if (iverdef->vd_cnt)
+	    iverdef->vd_nodename = iverdef->vd_auxptr->vda_nodename;
 
-	  if (i + 1 < hdr->sh_info)
+	  if ((size_t) (iverdef - iverdefarr) + 1 < maxidx)
 	    iverdef->vd_nextdef = iverdef + 1;
 	  else
 	    iverdef->vd_nextdef = NULL;
@@ -6409,8 +6470,8 @@ _bfd_elf_slurp_version_tables (bfd *abfd, bfd_boolean default_imported_symver)
       else
 	freeidx++;
 
-      amt = (bfd_size_type) freeidx * sizeof (Elf_Internal_Verdef);
-      elf_tdata (abfd)->verdef = bfd_zalloc (abfd, amt);
+      elf_tdata (abfd)->verdef = bfd_zalloc2 (abfd, freeidx,
+					      sizeof (Elf_Internal_Verdef));
       if (elf_tdata (abfd)->verdef == NULL)
 	goto error_return;
 
@@ -6434,10 +6495,11 @@ _bfd_elf_slurp_version_tables (bfd *abfd, bfd_boolean default_imported_symver)
 
       iverdef->vd_nodename = bfd_elf_get_dt_soname (abfd);
       if (iverdef->vd_nodename == NULL)
-	goto error_return;
+	goto error_return_verdef;
       iverdef->vd_nextdef = NULL;
-      amt = (bfd_size_type) sizeof (Elf_Internal_Verdaux);
-      iverdef->vd_auxptr = bfd_alloc (abfd, amt);
+      iverdef->vd_auxptr = bfd_alloc (abfd, sizeof (Elf_Internal_Verdaux));
+      if (iverdef->vd_auxptr == NULL)
+	goto error_return_verdef;
 
       iverdaux = iverdef->vd_auxptr;
       iverdaux->vda_nodename = iverdef->vd_nodename;