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[libpng16] Avoid potential pointer overflow in png_handle_sPLT() and

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png_handle_pCAL() (Bug report by John Regehr).
This commit is contained in:
Glenn Randers-Pehrson
2015-11-13 11:05:27 -06:00
parent f1cdf4e1ca
commit 0b4e7deab1
3 changed files with 7 additions and 3 deletions
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6
pngrutil.c
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@@ -1,7 +1,7 @@
/* pngrutil.c - utilities to read a PNG file
*
* Last changed in libpng 1.6.19 [November 12, 2015]
* Last changed in libpng 1.6.20 [(PENDING RELEASE)]
* Copyright (c) 1998-2015 Glenn Randers-Pehrson
* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
* (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
@@ -1670,7 +1670,7 @@ png_handle_sPLT(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length)
++entry_start;
/* A sample depth should follow the separator, and we should be on it */
if (entry_start > buffer + length - 2)
if (length < 2 || entry_start > buffer + length - 2)
{
png_warning(png_ptr, "malformed sPLT chunk");
return;
@@ -2174,7 +2174,7 @@ png_handle_pCAL(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length)
/* We need to have at least 12 bytes after the purpose string
* in order to get the parameter information.
*/
if (endptr <= buf + 12)
if (length < 12 || endptr <= buf + 12)
{
png_chunk_benign_error(png_ptr, "invalid");
return;