[FFmpeg-devel] [PATCH 2/3] avcodec/mpeg12dec: Fix runtime error: left shift of negative value -13

[Michael Niedermayer]

Fixes: 709/clusterfuzz-testcase-4789836449841152

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/targets/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
---
 libavcodec/mpeg12dec.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavcodec/mpeg12dec.c b/libavcodec/mpeg12dec.c
index d44ddb20fa..27db14c35e 100644
--- a/libavcodec/mpeg12dec.c
+++ b/libavcodec/mpeg12dec.c
@@ -497,7 +497,7 @@ static inline int mpeg2_decode_block_intra(MpegEncContext *s,
     dc  = s->last_dc[component];
     dc += diff;
     s->last_dc[component] = dc;
-    block[0] = dc << (3 - s->intra_dc_precision);
+    block[0] = dc * (1 << (3 - s->intra_dc_precision));
     ff_tlog(s->avctx, "dc=%d\n", block[0]);
     mismatch = block[0] ^ 1;
     i = 0;
-- 
2.11.0