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libavcodec/wmalosslessdec: prevent sum of positive numbers from becoming negative

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Fixes: left shift of negative value -8321365
Fixes: 20506/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_WMALOSSLESS_fuzzer-4798062906310656

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 62e4003780cad60ac1371fef892da08c27069964)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2020-02-09 18:09:24 +01:00
parent 3ea3a94a1e
commit a4e9221bde
1 changed files with 1 additions and 1 deletions
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libavcodec/wmalosslessdec.c
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@ -164,7 +164,7 @@ typedef struct WmallDecodeCtx {
int transient_pos[WMALL_MAX_CHANNELS];
int seekable_tile;
int ave_sum[WMALL_MAX_CHANNELS];
unsigned ave_sum[WMALL_MAX_CHANNELS];
int channel_residues[WMALL_MAX_CHANNELS][WMALL_BLOCK_MAX_SIZE];