Fix stack buffer overflows when parsing corrupt ihex files.

	PR binutils/18750
	* ihex.c (ihex_scan): Fixes incorrect escape sequence in error message
	and stack overflow when char is signed and \200-\376 was in place of hex
	digit; also fixes \377 was handled as EOF instead of "incorrect character".
	(ihex_read_section): Changed for consistency.
	(ihex_bad_byte): Prevent (now impossible to trigger) stack
	overflow and incorrect escape sequence handling.
	* srec.c (srec_bad_byte): Likewise.

	* readelf.c (process_mips_specific): Fix incorrect escape
	sequence handling.

3 files changed, 16 insertions, 4 deletions

diff --git a/bfd/ChangeLog b/bfd/ChangeLog
index 986299d..a8b3646 100644
--- a/bfd/ChangeLog
+++ b/bfd/ChangeLog
@@ -1,3 +1,15 @@
+2015-08-04  Yuriy M. Kaminskiy"  <yumkam@gmail.com>
+	    Tyler Hicks  <tyhicks@canonical.com>
+
+	PR binutils/18750
+	* ihex.c (ihex_scan): Fixes incorrect escape sequence in error message
+	and stack overflow when char is signed and \200-\376 was in place of hex
+	digit; also fixes \377 was handled as EOF instead of "incorrect character".
+	(ihex_read_section): Changed for consistency.
+	(ihex_bad_byte): Prevent (now impossible to trigger) stack
+	overflow and incorrect escape sequence handling.
+	* srec.c (srec_bad_byte): Likewise.
+
 2015-08-03  Hans-Peter Nilsson  <hp@axis.com>
 
 	* elf32-cris.c (cris_elf_relocate_section)
diff --git a/bfd/ihex.c b/bfd/ihex.c
index 8e66372..38112f6 100644
--- a/bfd/ihex.c
+++ b/bfd/ihex.c
@@ -219,7 +219,7 @@ ihex_bad_byte (bfd *abfd, unsigned int lineno, int c, bfd_boolean error)
       char buf[10];
 
       if (! ISPRINT (c))
-	sprintf (buf, "\\%03o", (unsigned int) c);
+	sprintf (buf, "\\%03o", (unsigned int) c & 0xff);
       else
 	{
 	  buf[0] = c;
@@ -276,7 +276,7 @@ ihex_scan (bfd *abfd)
       else
 	{
 	  file_ptr pos;
-	  char hdr[8];
+	  unsigned char hdr[8];
 	  unsigned int i;
 	  unsigned int len;
 	  bfd_vma addr;
@@ -553,7 +553,7 @@ ihex_read_section (bfd *abfd, asection *section, bfd_byte *contents)
   error = FALSE;
   while ((c = ihex_get_byte (abfd, &error)) != EOF)
     {
-      char hdr[8];
+      unsigned char hdr[8];
       unsigned int len;
       unsigned int type;
       unsigned int i;
diff --git a/bfd/srec.c b/bfd/srec.c
index 24573cf..96b6a2f 100644
--- a/bfd/srec.c
+++ b/bfd/srec.c
@@ -249,7 +249,7 @@ srec_bad_byte (bfd *abfd,
       char buf[40];
 
       if (! ISPRINT (c))
-	sprintf (buf, "\\%03o", (unsigned int) c);
+	sprintf (buf, "\\%03o", (unsigned int) c & 0xff);
       else
 	{
 	  buf[0] = c;