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[legacy] Check for integer overflow in png_set_rgb_to_gray().

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This commit is contained in:
Glenn Randers-Pehrson 2011-06-07 15:56:02 -05:00
parent 1df0788b64
commit d572394c2a
3 changed files with 19 additions and 2 deletions
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3
ANNOUNCE
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@ -113,6 +113,9 @@ version 1.2.45beta01 [June 7, 2011]
Ported bugfix in pngrtran.c from 1.5.3: when expanding a paletted image,
always expand to RGBA if transparency is present.
version 1.2.45beta02 [June 7, 2011]
Check for integer overflow in png_set_rgb_to_gray().
(subscription required; visit
https://lists.sourceforge.net/lists/listinfo/png-mng-implement
to subscribe) or to glennrp at users.sourceforge.net

3
CHANGES
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@ -2714,6 +2714,9 @@ version 1.2.45beta01 [June 7, 2011]
Ported bugfix in pngrtran.c from 1.5.3: when expanding a paletted image,
always expand to RGBA if transparency is present.
version 1.2.45beta02 [June 7, 2011]
Check for integer overflow in png_set_rgb_to_gray().
Send comments/corrections/commendations to png-mng-implement at lists.sf.net
(subscription required; visit
https://lists.sourceforge.net/lists/listinfo/png-mng-implement

15
pngrtran.c
View File

@ -676,10 +676,21 @@ void PNGAPI
png_set_rgb_to_gray(png_structp png_ptr, int error_action, double red,
double green)
{
int red_fixed = (int)((float)red*100000.0 + 0.5);
int green_fixed = (int)((float)green*100000.0 + 0.5);
int red_fixed, green_fixed;
if (png_ptr == NULL)
return;
if (red > 21474.83647 || red < -21474.83648 ||
green > 21474.83647 || green < -21474.83648)
{
png_warning(png_ptr, "ignoring out of range rgb_to_gray coefficients");
red_fixed = -1;
green_fixed = -1;
}
else
{
red_fixed = (int)((float)red*100000.0 + 0.5);
green_fixed = (int)((float)green*100000.0 + 0.5);
}
png_set_rgb_to_gray_fixed(png_ptr, error_action, red_fixed, green_fixed);
}
#endif