[FFmpeg-devel] [PATCH] avcodec/utils: Check bits_per_coded_sample
Michael Niedermayer
michael at niedermayer.cc
Wed Jun 19 21:42:55 EEST 2019
This avoids the need for each decoder separately having to handle this case
Fixes: shift exponent -100663046 is negative
Fixes: out of array access
Fixes: 15270/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_IFF_ILBM_fuzzer-5727829913763840
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/utils.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/libavcodec/utils.c b/libavcodec/utils.c
index cc04b73471..1b1feca38c 100644
--- a/libavcodec/utils.c
+++ b/libavcodec/utils.c
@@ -962,6 +962,10 @@ FF_ENABLE_DEPRECATION_WARNINGS
ret = AVERROR(EINVAL);
goto free_and_end;
}
+ if (avctx->bits_per_coded_sample < 0) {
+ ret = AVERROR(EINVAL);
+ goto free_and_end;
+ }
if (avctx->sub_charenc) {
if (avctx->codec_type != AVMEDIA_TYPE_SUBTITLE) {
av_log(avctx, AV_LOG_ERROR, "Character encoding is only "
--
2.21.0
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