avcodec/mlpdec: Fix runtime error: left shift of negative value -22

Fixes: 1355/clusterfuzz-testcase-minimized-6662205472768000
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/targets/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

diff --git a/libavcodec/mlpdec.c b/libavcodec/mlpdec.c
index c93b058dd7a66f4eb39299f6fd17b5ea65383640..7cad5d1cadb219b439e45452c7b4df6b90222115 100644 (file)
--- a/libavcodec/mlpdec.c
+++ b/libavcodec/mlpdec.c
@@ -264,7 +264,7 @@ static inline int read_huff_channels(MLPDecodeContext *m, GetBitContext *gbp,
             result = (result << lsb_bits) + get_bits(gbp, lsb_bits);
 
         result  += cp->sign_huff_offset;
-        result <<= quant_step_size;
+        result *= 1 << quant_step_size;
 
         m->sample_buffer[pos + s->blockpos][channel] = result;
     }