commit ff5cce2eafeb5f94917ffab913bbaed921c4d51c
author Michael Niedermayer <michael@niedermayer.cc> Thu Jan 12 23:42:59 2023 +0100
committer Michael Niedermayer <michael@niedermayer.cc> Sat Feb 25 22:50:36 2023 +0100
tree dd8ce8b08b8984cbb1edce656ca7934c03296d6d
parent 1eb1acb62b5afe215643a55f06c16545e5b20fb6

avcodec/motionpixels: Mask pixels to valid values

Fixes: out of array access
Fixes: 48567/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_MOTIONPIXELS_fuzzer-6724203352555520

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit ac6eec1fc258efce219e4fccb84312a1b13a7a23)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavcodec/motionpixels.c

diff --git a/libavcodec/motionpixels.c b/libavcodec/motionpixels.c
index 4141c5a..a947ca0 100644
--- a/libavcodec/motionpixels.c
+++ b/libavcodec/motionpixels.c
@@ -185,7 +185,7 @@
     int color;
 
     color = *(uint16_t *)&mp->frame->data[0][y * mp->frame->linesize[0] + x * 2];
-    return mp_rgb_yuv_table[color];
+    return mp_rgb_yuv_table[color & 0x7FFF];
 }
 
 static void mp_set_rgb_from_yuv(MotionPixelsContext *mp, int x, int y, const YuvPixel *p)