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[FFmpeg-devel,2/5] avformat/imx: Check palette chunk size

Message ID 20210330113129.14852-2-michael@niedermayer.cc
State Accepted
Commit f7a515044766426cf3cac20bdc091b700f00a458
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Series [FFmpeg-devel,1/5] avcodec/h265_metadata_bsf: Check nb_units before accessing the first in h265_metadata_update_fragment()
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Commit Message

Michael Niedermayer March 30, 2021, 11:31 a.m. UTC
Fixes: out of array write
Fixes: 32116/clusterfuzz-testcase-minimized-ffmpeg_dem_SIMBIOSIS_IMX_fuzzer-6702533894602752

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
 libavformat/imx.c | 2 ++
 1 file changed, 2 insertions(+)
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Patch

diff --git a/libavformat/imx.c b/libavformat/imx.c
index d203ed7a28..22fca0bdc0 100644
--- a/libavformat/imx.c
+++ b/libavformat/imx.c
@@ -113,6 +113,8 @@  retry:
             imx->first_video_packet_pos = pos;
         break;
     case 0xAA98:
+        if (chunk_size > 256 * 3)
+            return AVERROR_INVALIDDATA;
         for (int i = 0; i < chunk_size / 3; i++) {
             unsigned r = avio_r8(pb) << 18;
             unsigned g = avio_r8(pb) << 10;