On Mon, Mar 16, 2020 at 10:45:21AM +0100, Anton Khirnov wrote: > Quoting Michael Niedermayer (2020-03-15 22:20:55) > > Fixes: signed integer overflow: 2 * 1210064928 cannot be represented in > > type 'int' > > Fixes: > > 20873/clusterfuzz-testcase-minimized-ffmpeg_DEMUXER_fuzzer-5761116909338624 > > > > Found-by: continuous fuzzing process > > https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg > > Signed-off-by: Michael Niedermayer <mich...@niedermayer.cc> > > --- > > libavformat/asfdec_f.c | 2 +- > > 1 file changed, 1 insertion(+), 1 deletion(-) > > > > diff --git a/libavformat/asfdec_f.c b/libavformat/asfdec_f.c > > index 57dc3b09b9..3f19747d78 100644 > > --- a/libavformat/asfdec_f.c > > +++ b/libavformat/asfdec_f.c > > @@ -321,7 +321,7 @@ static void get_tag(AVFormatContext *s, const char > > *key, int type, int len, int > > int64_t off = avio_tell(s->pb); > > #define LEN 22 > > > > - if ((unsigned)len >= (UINT_MAX - LEN) / 2) > > + if ((unsigned)len >= (INT_MAX - LEN) / 2) > > Is the cast still necessary then?
it only makes a difference for negative len. And negative len looks invalid and would cause problems. So some check for negative len is needed, the (unsigned) achievs this but i can replace it by an explicit len < 0 if people prefer ? thx [...] -- Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB Its not that you shouldnt use gotos but rather that you should write readable code and code with gotos often but not always is less readable
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