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pngdec: raise memory limit if needed

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Some PNG input contain chunks larger than libpng's default
memory-alloc limit (8M).
Raise this limit reasonably if it looks like the input bitstream
is larger than libpng's default limit.

BUG=webp:497

Change-Id: I2c9fbed727424042444b82cbf15e0781cefb38dc
(cherry picked from commit 8696147da4)
This commit is contained in:
Pascal Massimino
2021-01-08 08:46:20 +01:00
committed by James Zern
parent a92254107e
commit e56c3c5be3
1 changed files with 6 additions and 0 deletions
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6
imageio/pngdec.c
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@@ -259,6 +259,12 @@ int ReadPNG(const uint8_t* const data, size_t data_size,
goto End; goto End;
} }
// If it looks like the bitstream is going to need more memory than libpng's
// internal limit (default: 8M), try to (reasonably) raise it.
if (data_size > png_get_chunk_malloc_max(png) && data_size < (1u << 24)) {
png_set_chunk_malloc_max(png, data_size);
}
info = png_create_info_struct(png); info = png_create_info_struct(png);
if (info == NULL) goto Error; if (info == NULL) goto Error;
end_info = png_create_info_struct(png); end_info = png_create_info_struct(png);