Message ID | 20200625181308.16685-1-michael@niedermayer.cc |
---|---|
State | Accepted |
Commit | 65b1ba680fb67902a9c876a49d0146eaae5a1c3d |
Headers | show |
Series | [FFmpeg-devel] avcodec/pngdec: Check for fctl after idat | expand |
Context | Check | Description |
---|---|---|
andriy/default | pending | |
andriy/make | success | Make finished |
andriy/make_fate | success | Make fate finished |
On Thu, Jun 25, 2020 at 08:13:08PM +0200, Michael Niedermayer wrote: > Fixes: out of array access > Fixes: 23554/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_APNG_fuzzer-4796622520451072.fuzz > > Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg > Signed-off-by: Michael Niedermayer <michael@niedermayer.cc> > --- > libavcodec/pngdec.c | 5 +++++ > 1 file changed, 5 insertions(+) will apply [...]
diff --git a/libavcodec/pngdec.c b/libavcodec/pngdec.c index ff3882a58d..647e7f0a74 100644 --- a/libavcodec/pngdec.c +++ b/libavcodec/pngdec.c @@ -984,6 +984,11 @@ static int decode_fctl_chunk(AVCodecContext *avctx, PNGDecContext *s, return AVERROR_INVALIDDATA; } + if (s->pic_state & PNG_IDAT) { + av_log(avctx, AV_LOG_ERROR, "fctl after IDAT\n"); + return AVERROR_INVALIDDATA; + } + s->last_w = s->cur_w; s->last_h = s->cur_h; s->last_x_offset = s->x_offset;
Fixes: out of array access Fixes: 23554/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_APNG_fuzzer-4796622520451072.fuzz Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer <michael@niedermayer.cc> --- libavcodec/pngdec.c | 5 +++++ 1 file changed, 5 insertions(+)