[FFmpeg-devel] [PATCH 3/3] avcodec/alsdec: Fix integer overflow with shifting samples

[Michael Niedermayer]

Fixes: signed integer overflow: -346039050 * 8 cannot be represented in type 'int'
Fixes: 15283/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_ALS_fuzzer-5692700268953600

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

diff --git a/libavcodec/alsdec.c b/libavcodec/alsdec.c
index b7ce5c7844..e50a287f19 100644
--- a/libavcodec/alsdec.c
+++ b/libavcodec/alsdec.c
@@ -1033,7 +1033,7 @@ static int decode_block(ALSDecContext *ctx, ALSBlockData *bd)
 
     if (*bd->shift_lsbs)
         for (smp = 0; smp < bd->block_length; smp++)
-            bd->raw_samples[smp] <<= *bd->shift_lsbs;
+            bd->raw_samples[smp] = (unsigned)bd->raw_samples[smp] << *bd->shift_lsbs;
 
     return 0;
 }
-- 
2.22.0