[FFmpeg-devel] [PATCH 1/5] avcodec/vmixdec: Check for end of input in decode_dcac()
Michael Niedermayer
michael at niedermayer.cc
Sun Jul 23 21:02:59 EEST 2023
Fixes: Timeout
Fixes: 59952/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_VMIX_fuzzer-6718213736759296
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/vmixdec.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/libavcodec/vmixdec.c b/libavcodec/vmixdec.c
index b77c90929a..4cc5963e25 100644
--- a/libavcodec/vmixdec.c
+++ b/libavcodec/vmixdec.c
@@ -115,6 +115,8 @@ static int decode_dcac(AVCodecContext *avctx,
if (dc_run > 0) {
dc_run--;
} else {
+ if (get_bits_left(dc_gb) < 1)
+ return AVERROR_INVALIDDATA;
dc_v = get_se_golomb_vmix(dc_gb);
dc += (unsigned)dc_v;
if (!dc_v)
@@ -127,6 +129,8 @@ static int decode_dcac(AVCodecContext *avctx,
continue;
}
+ if (get_bits_left(ac_gb) < 1)
+ return AVERROR_INVALIDDATA;
ac_v = get_se_golomb_vmix(ac_gb);
i = scan[n];
block[i] = ((unsigned)ac_v * factors[i]) >> 4;
--
2.17.1
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