[FFmpeg-cvslog] avcodec/takdec: Check remaining space for first predictors

[Michael Niedermayer]

ffmpeg | branch: release/4.4 | Michael Niedermayer <michael at niedermayer.cc> | Sun May 11 23:09:07 2025 +0200| [d6e02ba2013fdcdaa1fa29298279f6cd7e203252] | committer: Michael Niedermayer

avcodec/takdec: Check remaining space for first predictors

Fixes: Timeout
Fixes: 403673829/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_TAK_fuzzer-5498240154009600

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 8e6db875afcd147d48718130fde4a05c3ac406db)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=d6e02ba2013fdcdaa1fa29298279f6cd7e203252
---

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

diff --git a/libavcodec/takdec.c b/libavcodec/takdec.c
index 931e5d3fb4..f603386015 100644
--- a/libavcodec/takdec.c
+++ b/libavcodec/takdec.c
@@ -432,6 +432,9 @@ static int decode_subframe(TAKDecContext *s, int32_t *decoded,
             return AVERROR_INVALIDDATA;
     }
 
+    if (get_bits_left(gb) < 2*10 + 2*size)
+        return AVERROR_INVALIDDATA;
+
     s->predictors[0] = get_sbits(gb, 10);
     s->predictors[1] = get_sbits(gb, 10);
     s->predictors[2] = get_sbits(gb, size) * (1 << (10 - size));