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| author | Michael Niedermayer <michaelni@gmx.at> | 2015-06-29 21:08:05 +0200 |
|---|---|---|
| committer | Michael Niedermayer <michaelni@gmx.at> | 2015-06-29 21:30:57 +0200 |
| commit | 47f4e2d8960ca756ca153ab8e3e93d80449b8c91 (patch) | |
| tree | a711c38f15f9f970bcfebf8a48eea580709813be /libavcodec/pngdec.c | |
| parent | 9842d6707fd660fc8dfd3a29c48a55c1293adeca (diff) | |
| download | ffmpeg-47f4e2d8960ca756ca153ab8e3e93d80449b8c91.tar.gz | |
avcodec/pngdec: Only allow one IHDR chunk
Multiple IHDR chunks are forbidden in PNG
Fixes inconsistency and out of array accesses
Fixes: asan_heap-oob_4d5c5a_1738_cov_2638287726_c-m2-8f2b481b7fd9bd745e620b7c01a18df2.png
Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
Diffstat (limited to 'libavcodec/pngdec.c')
| -rw-r--r-- | libavcodec/pngdec.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/libavcodec/pngdec.c b/libavcodec/pngdec.c index ceda383209..f8b398ffde 100644 --- a/libavcodec/pngdec.c +++ b/libavcodec/pngdec.c @@ -542,6 +542,11 @@ static int decode_ihdr_chunk(AVCodecContext *avctx, PNGDecContext *s, return AVERROR_INVALIDDATA; } + if (s->state & PNG_IHDR) { + av_log(avctx, AV_LOG_ERROR, "Multiple IHDR\n"); + return AVERROR_INVALIDDATA; + } + s->width = bytestream2_get_be32(&s->gb); s->height = bytestream2_get_be32(&s->gb); if (av_image_check_size(s->width, s->height, 0, avctx)) { |