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[libpng16] Stop a potential memleak in png_set_tRNS() (Bug report by Ted Ying).

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This commit is contained in:
Glenn Randers-Pehrson 2016-05-27 19:55:44 -05:00
parent 4e34fd3b8a
commit 8d16725373
3 changed files with 9 additions and 6 deletions
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1
ANNOUNCE
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@ -26,6 +26,7 @@ Other information:
Changes since the last public release (1.6.22):
Version 1.6.23beta01 [May 28, 2016]
Stop a potential memory leak in png_set_tRNS() (Bug report by Ted Ying).
Send comments/corrections/commendations to png-mng-implement at lists.sf.net
(subscription required; visit

1
CHANGES
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@ -5574,6 +5574,7 @@ Version 1.6.22 [May 26, 2016]
No changes.
Version 1.6.23beta01 [May 28, 2016]
Stop a potential memory leak in png_set_tRNS() (Bug report by Ted Ying).
Send comments/corrections/commendations to png-mng-implement at lists.sf.net
(subscription required; visit

13
pngset.c
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@ -1,8 +1,8 @@
/* pngset.c - storage of image information into info struct
*
* Last changed in libpng 1.6.21 [January 15, 2016]
* Copyright (c) 1998-2015 Glenn Randers-Pehrson
* Last changed in libpng 1.6.23 [(PENDING RELEASE)]
* Copyright (c) 1998-2016 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.)
*
@ -952,12 +952,13 @@ png_set_tRNS(png_structrp png_ptr, png_inforp info_ptr,
png_free_data(png_ptr, info_ptr, PNG_FREE_TRNS, 0);
/* Changed from num_trans to PNG_MAX_PALETTE_LENGTH in version 1.2.1 */
png_ptr->trans_alpha = info_ptr->trans_alpha = png_voidcast(png_bytep,
png_malloc(png_ptr, PNG_MAX_PALETTE_LENGTH));
if (num_trans > 0 && num_trans <= PNG_MAX_PALETTE_LENGTH)
{
/* Changed from num_trans to PNG_MAX_PALETTE_LENGTH in version 1.2.1 */
png_ptr->trans_alpha = info_ptr->trans_alpha = png_voidcast(png_bytep,
png_malloc(png_ptr, PNG_MAX_PALETTE_LENGTH));
memcpy(info_ptr->trans_alpha, trans_alpha, (png_size_t)num_trans);
}
}
if (trans_color != NULL)