Message ID | 20201023183940.31485-2-michael@niedermayer.cc |
---|---|
State | Accepted |
Headers | show |
Series | [FFmpeg-devel,1/8] avcodec/magicyuv: Check slice size before reading flags and pred | expand |
Context | Check | Description |
---|---|---|
andriy/x86_make | success | Make finished |
andriy/x86_make_fate | success | Make fate finished |
diff --git a/tools/target_dem_fuzzer.c b/tools/target_dem_fuzzer.c index 8c9e373367..4add459aef 100644 --- a/tools/target_dem_fuzzer.c +++ b/tools/target_dem_fuzzer.c @@ -49,6 +49,8 @@ static int io_read(void *opaque, uint8_t *buf, int buf_size) c->filesize = FFMIN(c->pos, c->filesize); return AVERROR_EOF; } + if (c->pos > INT64_MAX - size) + return AVERROR(EIO); memcpy(buf, c->fuzz, size); c->fuzz += size;
Fixes: signed integer overflow: 9223372036854775807 + 564 cannot be represented in type 'long' Fixes: 26494/clusterfuzz-testcase-minimized-ffmpeg_dem_VOC_fuzzer-576754158849228 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer <michael@niedermayer.cc> --- tools/target_dem_fuzzer.c | 2 ++ 1 file changed, 2 insertions(+)