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[FFmpeg-devel,5/9] avcodec/vc1: Check remaining bits in ff_vc1_parse_frame_header()

Message ID 20210419182346.4445-5-michael@niedermayer.cc
State Accepted
Commit 38c47615880357314ba30727a85bf7b00989706a
Headers show
Series [FFmpeg-devel,1/9] avformat/utils: check dts/duration to be representable before using them | expand

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Commit Message

Michael Niedermayer April 19, 2021, 6:23 p.m. UTC 
Fixes: Timeout
Fixes: 33156/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_WMV3_fuzzer-6259655027326976

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
 libavcodec/vc1.c | 5 +++++
 1 file changed, 5 insertions(+)

Comments

Michael Niedermayer May 12, 2021, 8:53 p.m. UTC | #1 
On Mon, Apr 19, 2021 at 08:23:42PM +0200, Michael Niedermayer wrote:
> Fixes: Timeout
> Fixes: 33156/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_WMV3_fuzzer-6259655027326976
> 
> Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
> Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
> ---
>  libavcodec/vc1.c | 5 +++++
>  1 file changed, 5 insertions(+)

will apply

[...]
diff mbox series

Patch

diff --git a/libavcodec/vc1.c b/libavcodec/vc1.c
index b7140c089c..40e2b4d692 100644
--- a/libavcodec/vc1.c
+++ b/libavcodec/vc1.c
@@ -672,6 +672,8 @@  int ff_vc1_parse_frame_header(VC1Context *v, GetBitContext* gb)
     if (v->s.pict_type == AV_PICTURE_TYPE_P)
         v->rnd ^= 1;
 
+    if (get_bits_left(gb) < 5)
+        return AVERROR_INVALIDDATA;
     /* Quantizer stuff */
     pqindex = get_bits(gb, 5);
     if (!pqindex)
@@ -764,6 +766,9 @@  int ff_vc1_parse_frame_header(VC1Context *v, GetBitContext* gb)
         av_log(v->s.avctx, AV_LOG_DEBUG, "MB Skip plane encoding: "
                "Imode: %i, Invert: %i\n", status>>1, status&1);
 
+        if (get_bits_left(gb) < 4)
+            return AVERROR_INVALIDDATA;
+
         /* Hopefully this is correct for P-frames */
         v->s.mv_table_index = get_bits(gb, 2); //but using ff_vc1_ tables
         v->cbptab = get_bits(gb, 2);