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avcodec/rka: Fix signed integer overflow in decode_filter()

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Fixes: signed integer overflow: -631553 * 32768 cannot be represented in type 'int'
Fixes: 57814/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_RKA_fuzzer-4614661233573888

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
2023-04-09 14:48:37 +02:00
parent 80ac1fd148
commit 0ecda4fbce
1 changed files with 1 additions and 1 deletions
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libavcodec/rka.c
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@@ -737,7 +737,7 @@ static int decode_filter(RKAContext *s, ChContext *ctx, ACoder *ac, int off, uns
} }
ctx->buf0[off] = ctx->buf1[off] + ctx->buf0[off + -1]; ctx->buf0[off] = ctx->buf1[off] + ctx->buf0[off + -1];
} else { } else {
val *= 1 << ctx->cmode; val *= 1U << ctx->cmode;
sum += ctx->buf0[off + -1] + val; sum += ctx->buf0[off + -1] + val;
switch (s->bps) { switch (s->bps) {
case 16: sum = av_clip_int16(sum); break; case 16: sum = av_clip_int16(sum); break;