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[FFmpeg-devel,2/6] avcodec/wmalosslessdec: Fixes undefined overflow in dequantization in decode_subframe()

Message ID 20191129235921.13096-2-michael@niedermayer.cc
State New
Headers show

Commit Message

Michael Niedermayer Nov. 29, 2019, 11:59 p.m. UTC 
Fixes: signed integer overflow: 47875596 * 45 cannot be represented in type 'int'
Fixes: 19082/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_WMALOSSLESS_fuzzer-5687766512041984

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

diff --git a/libavcodec/wmalosslessdec.c b/libavcodec/wmalosslessdec.c
index d4f18b9841..245542e28d 100644
--- a/libavcodec/wmalosslessdec.c
+++ b/libavcodec/wmalosslessdec.c
@@ -977,7 +977,7 @@  static int decode_subframe(WmallDecodeCtx *s)
         if (s->quant_stepsize != 1)
             for (i = 0; i < s->num_channels; i++)
                 for (j = 0; j < subframe_len; j++)
-                    s->channel_residues[i][j] *= s->quant_stepsize;
+                    s->channel_residues[i][j] *= (unsigned)s->quant_stepsize;
     }
 
     /* Write to proper output buffer depending on bit-depth */