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[libpng16] Restrict the new ADLER32-skipping to IDAT chunks. It broke iCCP

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chunk handling.
This commit is contained in:
Glenn Randers-Pehrson
2016-10-28 15:50:46 -05:00
parent 858cb585d7
commit 2accfbd6f3
3 changed files with 7 additions and 2 deletions
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2
ANNOUNCE
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@@ -26,6 +26,8 @@ Other information:
Changes since the last public release (1.6.26):
Version 1.6.27beta01 [October 28, 2016]
Restrict the new ADLER32-skipping to IDAT chunks. It broke iCCP chunk
handling.
Send comments/corrections/commendations to png-mng-implement at lists.sf.net
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2
CHANGES
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@@ -5755,6 +5755,8 @@ Version 1.6.26 [October 20, 2016]
Despammed email addresses (replaced "@" with " at ").
Version 1.6.27beta01 [October 28, 2016]
Restrict the new ADLER32-skipping to IDAT chunks. It broke iCCP chunk
handling.
Send comments/corrections/commendations to png-mng-implement at lists.sf.net
(subscription required; visit

5
pngrutil.c
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@@ -1,7 +1,7 @@
/* pngrutil.c - utilities to read a PNG file
*
* Last changed in libpng 1.6.26 [October 20, 2016]
* Last changed in libpng 1.6.27 [(PENDING RELEASE)]
* Copyright (c) 1998-2002,2004,2006-2016 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.)
@@ -420,7 +420,8 @@ png_inflate_claim(png_structrp png_ptr, png_uint_32 owner)
#if ZLIB_VERNUM >= 0x1281
/* Turn off validation of the ADLER32 checksum in IDAT chunks */
if ((png_ptr->flags & PNG_FLAG_CRC_CRITICAL_IGNORE) != 0)
if ((png_ptr->flags & PNG_FLAG_CRC_CRITICAL_IGNORE) != 0 &&
png_ptr->zowner == png_IDAT)
ret = inflateValidate(&png_ptr->zstream, 0);
#endif