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

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>
5 years ago · 62e4003780
parent 2d465a401d
commit 62e4003780
1 changed files with 1 additions and 1 deletions
--- a/libavcodec/wmalosslessdec.c
+++ b/libavcodec/wmalosslessdec.c
@ -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];