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[FFmpeg-devel,2/8] tools/target_dem_fuzzer: Consider it an EIO when reading position wraps around 64bit

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
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Context Check Description
andriy/x86_make success Make finished
andriy/x86_make_fate success Make fate finished

Commit Message

Michael Niedermayer Oct. 23, 2020, 6:39 p.m. UTC
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(+)
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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;