[FFmpeg-devel] [PATCH] avcodec/osq: avoid signed overflow in downsample path
Michael Niedermayer
michael at niedermayer.cc
Fri Jun 21 22:35:48 EEST 2024
Fixes: signed integer overflow: 865309950 * 256 cannot be represented in type 'int'
Fixes: 69191/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_OSQ_fuzzer-6310214413385728
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/osq.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/libavcodec/osq.c b/libavcodec/osq.c
index 8a153330269..42a46b25ce5 100644
--- a/libavcodec/osq.c
+++ b/libavcodec/osq.c
@@ -325,7 +325,7 @@ static int do_decode(AVCodecContext *avctx, AVFrame *frame, int decorrelate, int
cb->prev = prev;
if (downsample)
- dst[n] *= 256;
+ dst[n] *= 256U;
dst[E] = dst[D];
dst[D] = dst[C];
--
2.45.2
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