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| author | Michael Niedermayer <michael@niedermayer.cc> | 2018-11-09 05:12:45 +0300 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2018-11-16 20:24:31 +0300 |
| commit | 14778d3fda0a1fe83d6f40cd8ee1dcf4199b1f98 (patch) | |
| tree | 737a388dc7d5920112dd9584b87396544750349b | |
| parent | 3c4a874388a903abc03954c9d5220a47a5e11df6 (diff) | |
avcodec/pngdec: Check compression method
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@niedermayer.cc>
(cherry picked from commit 1f99674ddddcc33f4c37def0a206e31ad7c4c1af)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
| -rw-r--r-- | libavcodec/pngdec.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/libavcodec/pngdec.c b/libavcodec/pngdec.c index 67a6e3f9d0..e25239780a 100644 --- a/libavcodec/pngdec.c +++ b/libavcodec/pngdec.c @@ -577,6 +577,10 @@ 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; + } s->filter_type = bytestream2_get_byte(&s->gb); s->interlace_type = bytestream2_get_byte(&s->gb); bytestream2_skip(&s->gb, 4); /* crc */ |