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[libpng15] Made the check for out-of-range values in png_set_tRNS() detect

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values that are exactly 2^bit_depth, and work on 16-bit platforms.
This commit is contained in:
Glenn Randers-Pehrson
2015-01-13 09:39:15 -06:00
parent ee48ecd71e
commit 747cea57e3
3 changed files with 23 additions and 15 deletions
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23
pngset.c
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@@ -1,7 +1,7 @@
/* pngset.c - storage of image information into info struct
*
* Last changed in libpng 1.5.20 [November 20, 2014]
* Last changed in libpng 1.5.22 [(PENDING RELEASE)]
* Copyright (c) 1998-2014 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.)
@@ -926,16 +926,19 @@ png_set_tRNS(png_structp png_ptr, png_infop info_ptr,
if (trans_color != NULL)
{
int sample_max = (1 << info_ptr->bit_depth);
if (info_ptr->bit_depth < 16)
{
unsigned int sample_max = (1U << info_ptr->bit_depth) - 1U;
if ((info_ptr->color_type == PNG_COLOR_TYPE_GRAY &&
(int)trans_color->gray > sample_max) ||
(info_ptr->color_type == PNG_COLOR_TYPE_RGB &&
((int)trans_color->red > sample_max ||
(int)trans_color->green > sample_max ||
(int)trans_color->blue > sample_max)))
png_warning(png_ptr,
"tRNS chunk has out-of-range samples for bit_depth");
if ((info_ptr->color_type == PNG_COLOR_TYPE_GRAY &&
trans_color->gray > sample_max) ||
(info_ptr->color_type == PNG_COLOR_TYPE_RGB &&
(trans_color->red > sample_max ||
trans_color->green > sample_max ||
trans_color->blue > sample_max)))
png_warning(png_ptr,
"tRNS chunk has out-of-range samples for bit_depth");
}
png_memcpy(&(info_ptr->trans_color), trans_color,
png_sizeof(png_color_16));