avcodec/amrwbdec: Fix runtime error: left shift of negative value -1
authorMichael Niedermayer <michael@niedermayer.cc>
Sat, 11 Mar 2017 02:55:39 +0000 (03:55 +0100)
committerMichael Niedermayer <michael@niedermayer.cc>
Sun, 12 Mar 2017 03:38:14 +0000 (04:38 +0100)
Fixes: 763/clusterfuzz-testcase-6007567320875008

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/targets/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
libavcodec/amrwbdec.c

index 999bfb9..57aed87 100644 (file)
@@ -262,7 +262,7 @@ static void decode_pitch_lag_high(int *lag_int, int *lag_frac, int pitch_index,
             *lag_frac = pitch_index - (*lag_int << 2) + 136;
         } else if (pitch_index < 440) {
             *lag_int  = (pitch_index + 257 - 376) >> 1;
-            *lag_frac = (pitch_index - (*lag_int << 1) + 256 - 376) << 1;
+            *lag_frac = (pitch_index - (*lag_int << 1) + 256 - 376) * 2;
             /* the actual resolution is 1/2 but expressed as 1/4 */
         } else {
             *lag_int  = pitch_index - 280;