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[libpng16] Don't check palette indexes if num_palette is 0 (as it can be in

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MNG files).
This commit is contained in:
Glenn Randers-Pehrson
2012-06-07 10:18:25 -05:00
parent 8f424b8270
commit 905cc94e3d
3 changed files with 7 additions and 4 deletions
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3
pngtrans.c
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@@ -625,7 +625,8 @@ png_do_bgr(png_row_infop row_info, png_bytep row)
void /* PRIVATE */
png_do_check_palette_indexes(png_structrp png_ptr, png_row_infop row_info)
{
if (png_ptr->num_palette < (1 << row_info->bit_depth))
if (png_ptr->num_palette < (1 << row_info->bit_depth) &&
png_ptr->num_palette > 0) /* num_palette can be 0 in MNG files */
{
/* Calculations moved outside switch in an attempt to stop different
* compiler warnings. 'padding' is in *bits* within the last byte, it is