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[libpng16] Reject attempt to write over-length PLTE chunk

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This commit is contained in:
Glenn Randers-Pehrson
2015-10-29 09:26:41 -05:00
parent 9c7ed35a65
commit 81f44665cc
4 changed files with 17 additions and 4 deletions
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7
pngwutil.c
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@@ -922,17 +922,20 @@ void /* PRIVATE */
png_write_PLTE(png_structrp png_ptr, png_const_colorp palette,
png_uint_32 num_pal)
{
png_uint_32 i;
png_uint_32 max_num_pal, i;
png_const_colorp pal_ptr;
png_byte buf[3];
png_debug(1, "in png_write_PLTE");
max_num_pal = (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) ?
(1 << png_ptr->bit_depth) : PNG_MAX_PALETTE_LENGTH;
if ((
#ifdef PNG_MNG_FEATURES_SUPPORTED
(png_ptr->mng_features_permitted & PNG_FLAG_MNG_EMPTY_PLTE) == 0 &&
#endif
num_pal == 0) || num_pal > 256)
num_pal == 0) || num_pal > max_num_pal)
{
if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
{