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[libpng16] Fixed the progressive reader to handle empty first IDAT chunk

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properly (patch by Timothy Nikkel).
This commit is contained in:
Timothy Nikkel 2016-05-29 09:31:48 -05:00 committed by Glenn Randers-Pehrson
parent 6c7459e455
commit 3f46c67c69
3 changed files with 17 additions and 9 deletions
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7
ANNOUNCE
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@ -1,4 +1,4 @@
Libpng 1.6.23beta01 - May 28, 2016
Libpng 1.6.23beta01 - May 29, 2016
This is not intended to be a public release. It will be replaced
within a few weeks by a public version or by another test version.
@ -25,8 +25,11 @@ Other information:
Changes since the last public release (1.6.22):
Version 1.6.23beta01 [May 28, 2016]
Version 1.6.23beta01 [May 29, 2016]
Stop a potential memory leak in png_set_tRNS() (Bug report by Ted Ying).
Fixed the progressive reader to handle empty first IDAT chunk properly
(patch by Timothy Nikkel). This bug was introduced in libpng-1.6.0 and
only affected the libpng16 branch.
Send comments/corrections/commendations to png-mng-implement at lists.sf.net
(subscription required; visit

5
CHANGES
View File

@ -5573,8 +5573,11 @@ Version 1.6.22rc03 [May 17, 2016]
Version 1.6.22 [May 26, 2016]
No changes.
Version 1.6.23beta01 [May 28, 2016]
Version 1.6.23beta01 [May 29, 2016]
Stop a potential memory leak in png_set_tRNS() (Bug report by Ted Ying).
Fixed the progressive reader to handle empty first IDAT chunk properly
(patch by Timothy Nikkel). This bug was introduced in libpng-1.6.0 and
only affected the libpng16 branch.
Send comments/corrections/commendations to png-mng-implement at lists.sf.net
(subscription required; visit

14
pngpread.c
View File

@ -1,8 +1,8 @@
/* pngpread.c - read a png file in push mode
*
* Last changed in libpng 1.6.18 [July 23, 2015]
* Copyright (c) 1998-2002,2004,2006-2015 Glenn Randers-Pehrson
* Last changed in libpng 1.6.23 [(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.)
*
@ -210,12 +210,14 @@ png_push_read_chunk(png_structrp png_ptr, png_inforp info_ptr)
(png_ptr->mode & PNG_HAVE_PLTE) == 0)
png_error(png_ptr, "Missing PLTE before IDAT");
png_ptr->mode |= PNG_HAVE_IDAT;
png_ptr->process_mode = PNG_READ_IDAT_MODE;
if ((png_ptr->mode & PNG_HAVE_CHUNK_AFTER_IDAT) == 0)
if (png_ptr->push_length == 0)
return;
if ((png_ptr->mode & PNG_HAVE_IDAT) != 0)
if ((png_ptr->mode & PNG_HAVE_CHUNK_AFTER_IDAT) == 0)
if (png_ptr->push_length == 0)
return;
png_ptr->mode |= PNG_HAVE_IDAT;
if ((png_ptr->mode & PNG_AFTER_IDAT) != 0)
png_benign_error(png_ptr, "Too many IDATs found");