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[FFmpeg-devel,4/4] avcodec/alac: Fix integer overflow in lpc_prediction() with sign

Message ID 20191108205710.32295-4-michael@niedermayer.cc
State Accepted
Commit 7686ba1f149a94c3bac235589de8aa8db92be4e5
Headers show

Commit Message

Michael Niedermayer Nov. 8, 2019, 8:57 p.m. UTC 
Fixes: signed integer overflow: -2147483648 * -1 cannot be represented in type 'int'
Fixes: 18643/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_ALAC_fuzzer-5672182449700864

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

diff --git a/libavcodec/alac.c b/libavcodec/alac.c
index 09decb806b..d08c946249 100644
--- a/libavcodec/alac.c
+++ b/libavcodec/alac.c
@@ -227,7 +227,7 @@  static void lpc_prediction(int32_t *error_buffer, uint32_t *buffer_out,
                 val  = d - pred[j];
                 sign = sign_only(val) * error_sign;
                 lpc_coefs[j] -= sign;
-                val *= sign;
+                val *= (unsigned)sign;
                 error_val -= (val >> lpc_quant) * (j + 1);
             }
         }