Update.

	* posix/regexec.c: Correct several memory allocation problems.
	Add more BE.
	* posix/regex_internal.c: Likewise.
	* posix/regcomp.c: Likewise.

4 files changed, 89 insertions, 70 deletions

diff --git a/posix/ptestcases.h b/posix/ptestcases.h
index 8f008ac..2819004 100644
--- a/posix/ptestcases.h
+++ b/posix/ptestcases.h
@@ -265,6 +265,7 @@
   { 1, 63, "a\\{1,63\\}", "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa",  },
   { 0, 0, "2.8.3.4  BRE Precedence", NULL, },
   { 0, 0, "GA143", NULL, },
+  { 0, 0, NULL, "There are numerous bugs in the original version." },
   { 2, 19, "\\^\\[[[.].]]\\\\(\\\\1\\\\)\\*\\\\{1,2\\\\}\\$", "a^[]\\(\\1\\)*\\{1,2\\}$b",  },
   { 1, 6, "[[=*=]][[=\\=]][[=]=]][[===]][[...]][[:punct:]]", "*\\]=.;",  },
   { 1, 6, "[$\\(*\\)^]*", "$\\()*^",  },
diff --git a/posix/regcomp.c b/posix/regcomp.c
index 6a77637..6fb1844 100644
--- a/posix/regcomp.c
+++ b/posix/regcomp.c
@@ -726,7 +726,7 @@ re_compile_internal (preg, pattern, length, syntax)
 
   /* Initialize the dfa.  */
   dfa = (re_dfa_t *) preg->buffer;
-  if (preg->allocated < sizeof (re_dfa_t))
+  if (BE (preg->allocated < sizeof (re_dfa_t), 0))
     {
       /* If zero allocated, but buffer is non-null, try to realloc
 	 enough space.  This loses if buffer's address is bogus, but
@@ -736,8 +736,8 @@ re_compile_internal (preg, pattern, length, syntax)
       if (dfa == NULL)
 	return REG_ESPACE;
       preg->allocated = sizeof (re_dfa_t);
+      preg->buffer = (unsigned char *) dfa;
     }
-  preg->buffer = (unsigned char *) dfa;
   preg->used = sizeof (re_dfa_t);
 
   err = init_dfa (dfa, length);
@@ -2269,7 +2269,7 @@ parse_sub_exp (regexp, preg, token, syntax, nest, err)
   bin_tree_t *tree, *left_par, *right_par;
   size_t cur_nsub;
   cur_nsub = preg->re_nsub++;
-  if (dfa->subexps_alloc < preg->re_nsub)
+  if (BE (dfa->subexps_alloc < preg->re_nsub, 0))
     {
       re_subexp_t *new_array;
       dfa->subexps_alloc *= 2;
@@ -2537,7 +2537,7 @@ build_range_exp (sbcset, start_elem, end_elem)
       return REG_ERANGE;
 
     /* Check the space of the arrays.  */
-    if (*range_alloc == mbcset->nranges)
+    if (BE (*range_alloc == mbcset->nranges, 0))
       {
 	/* There are not enough space, need realloc.  */
 	wchar_t *new_array_start, *new_array_end;
@@ -2764,7 +2764,7 @@ parse_bracket_exp (regexp, dfa, token, syntax, err)
 
 # ifdef RE_ENABLE_I18N
       /* Check the space of the arrays.  */
-      if (*range_alloc == mbcset->nranges)
+      if (BE (*range_alloc == mbcset->nranges, 0))
 	{
 	  /* There are not enough space, need realloc.  */
 	  uint32_t *new_array_start;
@@ -2870,17 +2870,19 @@ parse_bracket_exp (regexp, dfa, token, syntax, err)
 # ifdef RE_ENABLE_I18N
 	  /* Got valid collation sequence, add it as a new entry.  */
 	  /* Check the space of the arrays.  */
-	  if (*coll_sym_alloc == mbcset->ncoll_syms)
+	  if (BE (*coll_sym_alloc == mbcset->ncoll_syms, 0))
 	    {
 	      /* Not enough, realloc it.  */
 	      /* +1 in case of mbcset->ncoll_syms is 0.  */
-	      *coll_sym_alloc = 2 * mbcset->ncoll_syms + 1;
+	      int new_coll_sym_alloc = 2 * mbcset->ncoll_syms + 1;
 	      /* Use realloc since mbcset->coll_syms is NULL
 		 if *alloc == 0.  */
-	      mbcset->coll_syms = re_realloc (mbcset->coll_syms, int32_t,
-					      *coll_sym_alloc);
-	      if (BE (mbcset->coll_syms == NULL, 0))
+	      int32_t *new_coll_syms = re_realloc (mbcset->coll_syms, int32_t,
+						   new_coll_sym_alloc);
+	      if (BE (new_coll_syms == NULL, 0))
 		return REG_ESPACE;
+	      mbcset->coll_syms = new_coll_syms;
+	      *coll_sym_alloc = new_coll_sym_alloc;
 	    }
 	  mbcset->coll_syms[mbcset->ncoll_syms++] = idx;
 # endif /* RE_ENABLE_I18N */
@@ -3058,16 +3060,18 @@ parse_bracket_exp (regexp, dfa, token, syntax, err)
 #ifdef RE_ENABLE_I18N
 	    case MB_CHAR:
 	      /* Check whether the array has enough space.  */
-	      if (mbchar_alloc == mbcset->nmbchars)
+	      if (BE (mbchar_alloc == mbcset->nmbchars, 0))
 		{
+		  wchar_t *new_mbchars;
 		  /* Not enough, realloc it.  */
 		  /* +1 in case of mbcset->nmbchars is 0.  */
 		  mbchar_alloc = 2 * mbcset->nmbchars + 1;
 		  /* Use realloc since array is NULL if *alloc == 0.  */
-		  mbcset->mbchars = re_realloc (mbcset->mbchars, wchar_t,
-						mbchar_alloc);
-		  if (BE (mbcset->mbchars == NULL, 0))
+		  new_mbchars = re_realloc (mbcset->mbchars, wchar_t,
+					    mbchar_alloc);
+		  if (BE (new_mbchars == NULL, 0))
 		    goto parse_bracket_exp_espace;
+		  mbcset->mbchars = new_mbchars;
 		}
 	      mbcset->mbchars[mbcset->nmbchars++] = start_elem.opr.wch;
 	      break;
@@ -3339,16 +3343,19 @@ build_equiv_class (sbcset, name)
 	    }
 	}
       /* Check whether the array has enough space.  */
-      if (*equiv_class_alloc == mbcset->nequiv_classes)
+      if (BE (*equiv_class_alloc == mbcset->nequiv_classes, 0))
 	{
 	  /* Not enough, realloc it.  */
 	  /* +1 in case of mbcset->nequiv_classes is 0.  */
-	  *equiv_class_alloc = 2 * mbcset->nequiv_classes + 1;
+	  int new_equiv_class_alloc = 2 * mbcset->nequiv_classes + 1;
 	  /* Use realloc since the array is NULL if *alloc == 0.  */
-	  mbcset->equiv_classes = re_realloc (mbcset->equiv_classes, int32_t,
-					      *equiv_class_alloc);
-	  if (BE (mbcset->equiv_classes == NULL, 0))
+	  int32_t *new_equiv_classes = re_realloc (mbcset->equiv_classes,
+						   int32_t,
+						   new_equiv_class_alloc);
+	  if (BE (new_equiv_classes == NULL, 0))
 	    return REG_ESPACE;
+	  mbcset->equiv_classes = new_equiv_classes;
+	  *equiv_class_alloc = new_equiv_class_alloc;
 	}
       mbcset->equiv_classes[mbcset->nequiv_classes++] = idx1;
     }
@@ -3392,16 +3399,18 @@ build_charclass (trans, sbcset, class_name, syntax)
 
 #ifdef RE_ENABLE_I18N
   /* Check the space of the arrays.  */
-  if (*char_class_alloc == mbcset->nchar_classes)
+  if (BE (*char_class_alloc == mbcset->nchar_classes, 0))
     {
       /* Not enough, realloc it.  */
       /* +1 in case of mbcset->nchar_classes is 0.  */
-      *char_class_alloc = 2 * mbcset->nchar_classes + 1;
+      int new_char_class_alloc = 2 * mbcset->nchar_classes + 1;
       /* Use realloc since array is NULL if *alloc == 0.  */
-      mbcset->char_classes = re_realloc (mbcset->char_classes, wctype_t,
-					 *char_class_alloc);
-      if (BE (mbcset->char_classes == NULL, 0))
+      wctype_t *new_char_classes = re_realloc (mbcset->char_classes, wctype_t,
+					       new_char_class_alloc);
+      if (BE (new_char_classes == NULL, 0))
 	return REG_ESPACE;
+      mbcset->char_classes = new_char_classes;
+      *char_class_alloc = new_char_class_alloc;
     }
   mbcset->char_classes[mbcset->nchar_classes++] = __wctype (name);
 #endif /* RE_ENABLE_I18N */
diff --git a/posix/regex_internal.c b/posix/regex_internal.c
index 50d6a79..8b68bd6 100644
--- a/posix/regex_internal.c
+++ b/posix/regex_internal.c
@@ -756,10 +756,12 @@ re_node_set_add_intersect (dest, src1, src2)
     {
       if (src1->nelem + src2->nelem + dest->nelem > dest->alloc)
 	{
-	  dest->alloc = src1->nelem + src2->nelem + dest->nelem;
-	  dest->elems = re_realloc (dest->elems, int, dest->alloc);
-	  if (BE (dest->elems == NULL, 0))
+	  int new_alloc = src1->nelem + src2->nelem + dest->nelem;
+	  int *new_elems = re_realloc (dest->elems, int, new_alloc);
+	  if (BE (new_elems == NULL, 0))
 	    return REG_ESPACE;
+	  dest->elems = new_elems;
+	  dest->alloc = new_alloc;
 	}
     }
   else
@@ -857,12 +859,12 @@ re_node_set_merge (dest, src)
     return REG_NOERROR;
   if (dest->alloc < src->nelem + dest->nelem)
     {
-      int *new_buffer;
-      dest->alloc = 2 * (src->nelem + dest->alloc);
-      new_buffer = re_realloc (dest->elems, int, dest->alloc);
+      int new_alloc = 2 * (src->nelem + dest->alloc);
+      int *new_buffer = re_realloc (dest->elems, int, new_alloc);
       if (BE (new_buffer == NULL, 0))
 	return REG_ESPACE;
       dest->elems = new_buffer;
+      dest->alloc = new_alloc;
     }
 
   for (si = 0, di = 0 ; si < src->nelem && di < dest->nelem ;)
@@ -1042,25 +1044,24 @@ re_dfa_add_node (dfa, token, mode)
 {
   if (BE (dfa->nodes_len >= dfa->nodes_alloc, 0))
     {
-      re_token_t *new_array;
-      dfa->nodes_alloc *= 2;
-      new_array = re_realloc (dfa->nodes, re_token_t, dfa->nodes_alloc);
+      int new_nodes_alloc = dfa->nodes_alloc * 2;
+      re_token_t *new_array = re_realloc (dfa->nodes, re_token_t,
+					  new_nodes_alloc);
       if (BE (new_array == NULL, 0))
 	return -1;
-      else
-	dfa->nodes = new_array;
+      dfa->nodes = new_array;
       if (mode)
 	{
 	  int *new_nexts, *new_indices;
 	  re_node_set *new_edests, *new_eclosures, *new_inveclosures;
 
-	  new_nexts = re_realloc (dfa->nexts, int, dfa->nodes_alloc);
-	  new_indices = re_realloc (dfa->org_indices, int, dfa->nodes_alloc);
-	  new_edests = re_realloc (dfa->edests, re_node_set, dfa->nodes_alloc);
+	  new_nexts = re_realloc (dfa->nexts, int, new_nodes_alloc);
+	  new_indices = re_realloc (dfa->org_indices, int, new_nodes_alloc);
+	  new_edests = re_realloc (dfa->edests, re_node_set, new_nodes_alloc);
 	  new_eclosures = re_realloc (dfa->eclosures, re_node_set,
-				      dfa->nodes_alloc);
+				      new_nodes_alloc);
 	  new_inveclosures = re_realloc (dfa->inveclosures, re_node_set,
-					 dfa->nodes_alloc);
+					 new_nodes_alloc);
 	  if (BE (new_nexts == NULL || new_indices == NULL
 		  || new_edests == NULL || new_eclosures == NULL
 		  || new_inveclosures == NULL, 0))
@@ -1071,6 +1072,7 @@ re_dfa_add_node (dfa, token, mode)
 	  dfa->eclosures = new_eclosures;
 	  dfa->inveclosures = new_inveclosures;
 	}
+      dfa->nodes_alloc = new_nodes_alloc;
     }
   dfa->nodes[dfa->nodes_len] = token;
   dfa->nodes[dfa->nodes_len].duplicated = 0;
@@ -1223,14 +1225,15 @@ register_state (dfa, newstate, hash)
   struct re_state_table_entry *spot;
   spot = dfa->state_table + (hash & dfa->state_hash_mask);
 
-  if (spot->alloc <= spot->num)
+  if (BE (spot->alloc <= spot->num, 0))
     {
-      re_dfastate_t **new_array;
-      spot->alloc = 2 * spot->num + 2;
-      new_array = re_realloc (spot->array, re_dfastate_t *, spot->alloc);
+      int new_alloc = 2 * spot->num + 2;
+      re_dfastate_t **new_array = re_realloc (spot->array, re_dfastate_t *,
+					      new_alloc);
       if (BE (new_array == NULL, 0))
 	return REG_ESPACE;
       spot->array = new_array;
+      spot->alloc = new_alloc;
     }
   spot->array[spot->num++] = newstate;
   return REG_NOERROR;
diff --git a/posix/regexec.c b/posix/regexec.c
index 42b561a..0b52485 100644
--- a/posix/regexec.c
+++ b/posix/regexec.c
@@ -469,7 +469,7 @@ re_copy_regs (regs, pmatch, nregs, regs_allocated)
     { /* Yes.  If we need more elements than were already
 	 allocated, reallocate them.  If we need fewer, just
 	 leave it alone.  */
-      if (need_regs > regs->num_regs)
+      if (BE (need_regs > regs->num_regs, 0))
 	{
 	  regs->start = re_realloc (regs->start, regoff_t, need_regs);
 	  if (BE (regs->start == NULL, 0))
@@ -2666,14 +2666,17 @@ check_arrival (preg, mctx, path, top_node, top_str, last_node, last_str,
 
   subexp_num = dfa->nodes[top_node].opr.idx;
   /* Extend the buffer if we need.  */
-  if (path->alloc < last_str + mctx->max_mb_elem_len + 1)
+  if (BE (path->alloc < last_str + mctx->max_mb_elem_len + 1, 0))
     {
       re_dfastate_t **new_array;
       int old_alloc = path->alloc;
       path->alloc += last_str + mctx->max_mb_elem_len + 1;
       new_array = re_realloc (path->array, re_dfastate_t *, path->alloc);
       if (new_array == NULL)
-	return REG_ESPACE;
+	{
+	  path->alloc = old_alloc;
+	  return REG_ESPACE;
+	}
       path->array = new_array;
       memset (new_array + old_alloc, '\0',
 	      sizeof (re_dfastate_t *) * (path->alloc - old_alloc));
@@ -3818,9 +3821,11 @@ extend_buffers (mctx)
   if (mctx->state_log != NULL)
     {
       /* And double the length of state_log.  */
-      re_dfastate_t **new_array;
-      new_array = re_realloc (mctx->state_log, re_dfastate_t *,
-			      pstr->bufs_len + 1);
+      /* XXX We have no indication of the size of this buffer.  If this
+	 allocation fail we have no indication that the state_log array
+	 does not have the right size.  */
+      re_dfastate_t **new_array = re_realloc (mctx->state_log, re_dfastate_t *,
+					      pstr->bufs_len + 1);
       if (BE (new_array == NULL, 0))
 	return REG_ESPACE;
       mctx->state_log = new_array;
@@ -3995,9 +4000,7 @@ match_ctx_clear_flag (mctx)
 {
   int i;
   for (i = 0; i < mctx->nbkref_ents; ++i)
-    {
-      mctx->bkref_ents[i].flag = 0;
-    }
+    mctx->bkref_ents[i].flag = 0;
 }
 
 /* Register the node NODE, whose type is OP_OPEN_SUBEXP, and which matches
@@ -4012,18 +4015,19 @@ match_ctx_add_subtop (mctx, node, str_idx)
   assert (mctx->sub_tops != NULL);
   assert (mctx->asub_tops > 0);
 #endif
-  if (mctx->nsub_tops == mctx->asub_tops)
+  if (BE (mctx->nsub_tops == mctx->asub_tops, 0))
     {
-      re_sub_match_top_t **new_array;
-      mctx->asub_tops *= 2;
-      new_array = re_realloc (mctx->sub_tops, re_sub_match_top_t *,
-			      mctx->asub_tops);
+      int new_asub_tops = mctx->asub_tops * 2;
+      re_sub_match_top_t **new_array = re_realloc (mctx->sub_tops,
+						   re_sub_match_top_t *,
+						   new_asub_tops);
       if (BE (new_array == NULL, 0))
 	return REG_ESPACE;
       mctx->sub_tops = new_array;
+      mctx->asub_tops = new_asub_tops;
     }
   mctx->sub_tops[mctx->nsub_tops] = calloc (1, sizeof (re_sub_match_top_t));
-  if (mctx->sub_tops[mctx->nsub_tops] == NULL)
+  if (BE (mctx->sub_tops[mctx->nsub_tops] == NULL, 0))
     return REG_ESPACE;
   mctx->sub_tops[mctx->nsub_tops]->node = node;
   mctx->sub_tops[mctx->nsub_tops++]->str_idx = str_idx;
@@ -4039,23 +4043,25 @@ match_ctx_add_sublast (subtop, node, str_idx)
      int node, str_idx;
 {
   re_sub_match_last_t *new_entry;
-  if (subtop->nlasts == subtop->alasts)
+  if (BE (subtop->nlasts == subtop->alasts, 0))
     {
-      re_sub_match_last_t **new_array;
-      subtop->alasts = 2 * subtop->alasts + 1;
-      new_array = re_realloc (subtop->lasts, re_sub_match_last_t *,
-			      subtop->alasts);
+      int new_alasts = 2 * subtop->alasts + 1;
+      re_sub_match_last_t **new_array = re_realloc (subtop->lasts,
+						    re_sub_match_last_t *,
+						    new_alasts);
       if (BE (new_array == NULL, 0))
 	return NULL;
       subtop->lasts = new_array;
+      subtop->alasts = new_alasts;
     }
   new_entry = calloc (1, sizeof (re_sub_match_last_t));
-  if (BE (new_entry == NULL, 0))
-    return NULL;
-  subtop->lasts[subtop->nlasts] = new_entry;
-  new_entry->node = node;
-  new_entry->str_idx = str_idx;
-  ++subtop->nlasts;
+  if (BE (new_entry != NULL, 1))
+    {
+      subtop->lasts[subtop->nlasts] = new_entry;
+      new_entry->node = node;
+      new_entry->str_idx = str_idx;
+      ++subtop->nlasts;
+    }
   return new_entry;
 }