avcodec/mlpdec: Fix: runtime error: left shift of negative value -8

Fixes: 1658/clusterfuzz-testcase-minimized-4889937130291200
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 eaf1aa7c7517401d03949f4ce42cd8d4af5ecd0d..542671200727a79f1a8107ff18730d3a8eeafb06 100644 (file)
--- a/libavcodec/mlpdec.c
+++ b/libavcodec/mlpdec.c
@@ -759,7 +759,7 @@ static int read_matrix_params(MLPDecodeContext *m, unsigned int substr, GetBitCo
             if (get_bits1(gbp))
                 coeff_val = get_sbits(gbp, frac_bits + 2);
 
-            s->matrix_coeff[mat][ch] = coeff_val << (14 - frac_bits);
+            s->matrix_coeff[mat][ch] = coeff_val * (1 << (14 - frac_bits));
         }
 
         if (s->noise_type)