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| author | Michael Niedermayer <michael@niedermayer.cc> | 2020-05-10 20:15:11 +0200 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2020-05-12 01:00:28 +0200 |
| commit | 0c4330847c104fcf3ef929c1acee33b5b34c20db (patch) | |
| tree | 2b4686f18665cccbd9394554c030e262d722b3b7 /libavcodec/ralf.c | |
| parent | 1ac106bf5625de6aec31a34319298032e988f349 (diff) | |
| download | ffmpeg-0c4330847c104fcf3ef929c1acee33b5b34c20db.tar.gz | |
avcodec/ralf: Fix integer overflow in decode_block()
Fixes: signed integer overflow: 289082077 - -2003141111 cannot be represented in type 'int'
Fixes: 20492/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_RALF_fuzzer-5196077752123392
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
Diffstat (limited to 'libavcodec/ralf.c')
| -rw-r--r-- | libavcodec/ralf.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/libavcodec/ralf.c b/libavcodec/ralf.c index 831728177e..08e8043e30 100644 --- a/libavcodec/ralf.c +++ b/libavcodec/ralf.c @@ -344,7 +344,8 @@ static int decode_block(AVCodecContext *avctx, GetBitContext *gb, int len, ch, ret; int dmode, mode[2], bits[2]; int *ch0, *ch1; - int i, t, t2; + int i; + unsigned int t, t2; len = 12 - get_unary(gb, 0, 6); @@ -409,8 +410,8 @@ static int decode_block(AVCodecContext *avctx, GetBitContext *gb, for (i = 0; i < len; i++) { t = ch1[i] + ctx->bias[1]; t2 = ((ch0[i] + ctx->bias[0]) * 2) | (t & 1); - dst0[i] = (t2 + t) / 2; - dst1[i] = (t2 - t) / 2; + dst0[i] = (int)(t2 + t) / 2; + dst1[i] = (int)(t2 - t) / 2; } break; } |