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| author | Michael Niedermayer <michael@niedermayer.cc> | 2023-02-20 19:53:19 +0100 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2023-02-22 18:01:51 +0100 |
| commit | d495747a9fc5fb8dcac4b23c5bdca3c5c16dd152 (patch) | |
| tree | 7cd6d1e53de3557a6a060645fb77830997bec251 | |
| parent | b3df7ca748bf28e41a6fcb6792b485d8eb04b36a (diff) | |
| download | ffmpeg-d495747a9fc5fb8dcac4b23c5bdca3c5c16dd152.tar.gz | |
avcodec/rka: Fix some integer anomalies
Fixes: left shift of negative value -3201
Fixes: integer overflow: -76470276 * -25608 cannot be represented in type 'int'
Fixes: 56052/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_RKA_fuzzer-5236218750435328
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
| -rw-r--r-- | libavcodec/rka.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/libavcodec/rka.c b/libavcodec/rka.c index 461baf1e1f..994c563ffd 100644 --- a/libavcodec/rka.c +++ b/libavcodec/rka.c @@ -723,16 +723,16 @@ static int decode_filter(RKAContext *s, ChContext *ctx, ACoder *ac, int off, uns last_val = val; src = &ctx->buf1[off + -1]; for (int i = 0; i < filt.size && i < 15; i++) - sum += filt.coeffs[i] * src[-i]; + sum += filt.coeffs[i] * (unsigned)src[-i]; sum = sum * 2; for (int i = 15; i < filt.size; i++) - sum += filt.coeffs[i] * src[-i]; + sum += filt.coeffs[i] * (unsigned)src[-i]; sum = sum >> 6; if (ctx->cmode == 0) { if (bits == 0) { ctx->buf1[off] = sum + val; } else { - ctx->buf1[off] = (val + (sum >> bits) << bits) + + ctx->buf1[off] = (val + (sum >> bits)) * (1 << bits) + (((1U << bits) - 1U) & ctx->buf1[off + -1]); } ctx->buf0[off] = ctx->buf1[off] + ctx->buf0[off + -1]; |