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avcodec/iff: Skip overflowing runs in decode_delta_d()

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Fixes: Timeout (107sec - 75ms>
Fixes: 18812/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_IFF_ILBM_fuzzer-6295585225441280

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 2019-11-18 09:45:29 +01:00
parent 2c2ee67fd3
commit 185f441ba2
1 changed files with 2 additions and 0 deletions
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2
libavcodec/iff.c
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@ -1359,6 +1359,8 @@ static void decode_delta_d(uint8_t *dst,
bytestream2_seek_p(&pb, (offset / planepitch_byte) * pitch + (offset % planepitch_byte) + k * planepitch, SEEK_SET);
if (opcode >= 0) {
uint32_t x = bytestream2_get_be32(&gb);
if (opcode && 4 + (opcode - 1LL) * pitch > bytestream2_get_bytes_left_p(&pb))
continue;
while (opcode && bytestream2_get_bytes_left_p(&pb) > 0) {
bytestream2_put_be32(&pb, x);
bytestream2_skip_p(&pb, pitch - 4);