[FFmpeg-devel] [PATCH] avcodec/pngdec: Check compression method
Carl Eugen Hoyos
ceffmpeg at gmail.com
Fri Nov 9 17:13:19 EET 2018
2018-11-09 10:31 GMT+01:00, Michael Niedermayer <michael at niedermayer.cc>:
> method 0 (inflate/deflate) is the only specified in the specification and
> the only supported
>
> Fixes: Timeout
> Fixes:
> 10976/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_PNG_fuzzer-5729372588736512
>
> Found-by: continuous fuzzing process
> https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
> Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
> ---
> libavcodec/pngdec.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/libavcodec/pngdec.c b/libavcodec/pngdec.c
> index 01144680f2..189bb9a4c1 100644
> --- a/libavcodec/pngdec.c
> +++ b/libavcodec/pngdec.c
> @@ -578,6 +578,10 @@ static int decode_ihdr_chunk(AVCodecContext *avctx,
> PNGDecContext *s,
> }
> s->color_type = bytestream2_get_byte(&s->gb);
> s->compression_type = bytestream2_get_byte(&s->gb);
> + if (s->compression_type) {
> + av_log(avctx, AV_LOG_ERROR, "Invalid compression method %d\n",
> s->compression_type);
> + goto error;
Would the native FFmpeg zlib decompression code - if merged - avoid this issue?
Carl Eugen
More information about the ffmpeg-devel
mailing list