[FFmpeg-devel] [PATCH 1/7] avcodec/mmvideo: fix paltte index

[Michael Niedermayer]

Fixes: 391935573/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_MMVIDEO_fuzzer-4655048979709952
Fixes: out of array access

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/mmvideo.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavcodec/mmvideo.c b/libavcodec/mmvideo.c
index 7313507debc..2a0c855992e 100644
--- a/libavcodec/mmvideo.c
+++ b/libavcodec/mmvideo.c
@@ -91,7 +91,7 @@ static void mm_decode_pal(MmContext *s)
     int start = bytestream2_get_le16(&s->gb);
     int count = bytestream2_get_le16(&s->gb);
     for (int i = 0; i < count; i++)
-        s->palette[start+i] = 0xFFU << 24 | (bytestream2_get_be24(&s->gb) << 2);
+        s->palette[(start+i)&0xFF] = 0xFFU << 24 | (bytestream2_get_be24(&s->gb) << 2);
 }
 
 /**
-- 
2.49.0