On Thu, Sep 19, 2024 at 08:53:07PM -0300, James Almer wrote: > On 9/19/2024 7:56 PM, Michael Niedermayer wrote: > > Fixes: shift exponent 62 is too large for 32-bit type 'int' > > Fixes: > > 71020/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_VVC_fuzzer-6444916325023744 > > > > 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_h266_syntax_template.c | 3 +++ > > 1 file changed, 3 insertions(+) > > > > diff --git a/libavcodec/cbs_h266_syntax_template.c > > b/libavcodec/cbs_h266_syntax_template.c > > index a8f5af04d02..1c111126563 100644 > > --- a/libavcodec/cbs_h266_syntax_template.c > > +++ b/libavcodec/cbs_h266_syntax_template.c > > @@ -1041,6 +1041,9 @@ static int > > FUNC(sps_range_extension)(CodedBitstreamContext *ctx, RWContext *rw, > > { > > int err; > > + if (current->sps_bitdepth_minus8 < 10) > > sps_bitdepth_minus8 can only be between 0 and 8, so this is basically making > it abort on any and every sample with SPS range extension.
+ if (current->sps_bitdepth_minus8 < 10 - 8) Its supposed to check this: "When BitDepth is less than or equal to 10, the value of sps_range_extension_flag shall be equal to 0." > > Also, it doesn't seem to be used here at all, so i don't see how this is > fixing anything. Can you share the sample? its used here: libavcodec/vvc/ctu.c: persistent_rice_adaptation_enabled_flag ? 2 * (av_log2(bit_depth - 10)) : 0; I can send you the file but i think this case is quite clear thx [...] -- Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB When you are offended at any man's fault, turn to yourself and study your own failings. Then you will forget your anger. -- Epictetus
signature.asc
Description: PGP signature
_______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-devel To unsubscribe, visit link above, or email ffmpeg-devel-requ...@ffmpeg.org with subject "unsubscribe".
