[FFmpeg-cvslog] avcodec/svq3: Check for minimum size input

[Michael Niedermayer]

ffmpeg | branch: release/4.3 | Michael Niedermayer <michael at niedermayer.cc> | Sun Sep 22 20:31:58 2024 +0200| [ab42cdfd0ebc97446da28dbf557dae6d0623ecb4] | committer: Michael Niedermayer

avcodec/svq3: Check for minimum size input

Fixes: Timeout
Fixes: 71295/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_SVQ3_fuzzer-4999941125111808

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit 050b5e85cbe61414ba9b78f76a04b2488e816f42)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=ab42cdfd0ebc97446da28dbf557dae6d0623ecb4
---

 libavcodec/svq3.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/libavcodec/svq3.c b/libavcodec/svq3.c
index 8a67836827..fef0202b79 100644
--- a/libavcodec/svq3.c
+++ b/libavcodec/svq3.c
@@ -1439,6 +1439,9 @@ static int svq3_decode_frame(AVCodecContext *avctx, void *data,
     if (svq3_decode_slice_header(avctx))
         return -1;
 
+    if (avpkt->size < s->mb_width * s->mb_height / 8)
+        return AVERROR_INVALIDDATA;
+
     s->pict_type = s->slice_type;
 
     if (s->pict_type != AV_PICTURE_TYPE_B)