On Mon, Jul 24, 2023 at 11:28:20PM -0300, James Almer wrote: > On 7/24/2023 9:46 PM, Michael Niedermayer wrote: > > The unchecked read caused the 2nd subsequent tell call to move backward > > resulting > > in a negative length > > > > Fixes: assertion failure > > Fixes: > > 60276/clusterfuzz-testcase-minimized-ffmpeg_BSF_TRACE_HEADERS_fuzzer-5434126636023808 > > > > Found-by: continuous fuzzing process > > https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg > > Signed-off-by: Michael Niedermayer <mich...@niedermayer.cc> > > --- > > libavcodec/cbs_h2645.c | 2 +- > > 1 file changed, 1 insertion(+), 1 deletion(-) > > > > diff --git a/libavcodec/cbs_h2645.c b/libavcodec/cbs_h2645.c > > index 34c5d1d372..21c8bc76d5 100644 > > --- a/libavcodec/cbs_h2645.c > > +++ b/libavcodec/cbs_h2645.c > > @@ -695,7 +695,7 @@ static int > > cbs_h2645_split_fragment(CodedBitstreamContext *ctx, > > int nal_unit_type = bytestream2_get_byte(&gbc) & 0x1f; > > unsigned int num_nalus = 1; > > if(nal_unit_type != VVC_DCI_NUT && nal_unit_type != > > VVC_OPI_NUT) > > - num_nalus = bytestream2_get_be16u(&gbc); > > + num_nalus = bytestream2_get_be16(&gbc); > > start = bytestream2_tell(&gbc); > > for(i = 0; i < num_nalus; i++) { > > LGTM.
will apply thx [...] -- Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB "You are 36 times more likely to die in a bathtub than at the hands of a terrorist. Also, you are 2.5 times more likely to become a president and 2 times more likely to become an astronaut, than to die in a terrorist attack." -- Thoughty2
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