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avcodec/wavpack: Fix integer overflow in DEC_MED() / INC_MED()

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Fixes: runtime error: signed integer overflow: 2147483637 + 128 cannot be represented in type 'int'
Fixes: 6701/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_WAVPACK_fuzzer-5358324934508544

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2018-04-27 21:44:07 +02:00
parent da038c07f0
commit 6e95d80e6f
1 changed files with 2 additions and 2 deletions
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4
libavcodec/wavpack.h
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@ -99,8 +99,8 @@ typedef struct WvChannel {
// macros for manipulating median values
#define GET_MED(n) ((c->median[n] >> 4) + 1)
#define DEC_MED(n) c->median[n] -= ((c->median[n] + (128 >> (n)) - 2) / (128 >> (n))) * 2U
#define INC_MED(n) c->median[n] += ((c->median[n] + (128 >> (n)) ) / (128 >> (n))) * 5U
#define DEC_MED(n) c->median[n] -= ((int)(c->median[n] + (128U >> (n)) - 2) / (128 >> (n))) * 2U
#define INC_MED(n) c->median[n] += ((int)(c->median[n] + (128U >> (n)) ) / (128 >> (n))) * 5U
// macros for applying weight
#define UPDATE_WEIGHT_CLIP(weight, delta, samples, in) \