Ping ? Jocke
On Fri, 2020-10-16 at 10:57 +0200, Joakim Tjernlund wrote: > From https://bugs.chromium.org/p/chromium/issues/detail?id=1095962 > ---------------------------- > This seems to be caused by the custom handling of "av_max_alloc(0)" in > Chromium's ffmpeg fork to mean unlimited (added in [1]). > > Upstream ffmpeg doesn't treat 0 as a special value; versions before 4.3 > seemingly worked > because 32 was subtracted from max_alloc_size (set to 0 by Chromium) > resulting in an > integer underflow, making the effective limit be SIZE_MAX - 31. > > Now that the above underflow doesn't happen, the tab just crashes. The > upstream change > for no longer subtracting 32 from max_alloc_size was included in ffmpeg 4.3. > [2] > > [1] > https://chromium-review.googlesource.com/c/chromium/third_party/ffmpeg/+/73563 > [2] https://github.com/FFmpeg/FFmpeg/commit/731c77589841 > --------------------------- > > Restore av_malloc_max(0) to MAX_INT fixing MS Teams, Discord older chromium > etc. > > Signed-off-by: Joakim Tjernlund <joakim.tjernl...@infinera.com> > --- > > v2: Cover the full API range 0-31 > > v3: Closer compat with < 4.3 ffmpeg > > v4: Adjust size accoriding to Andreas Rheinhardt comments > > libavutil/mem.c | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/libavutil/mem.c b/libavutil/mem.c > index cfb6d8a..44870a9 100644 > --- a/libavutil/mem.c > +++ b/libavutil/mem.c > @@ -71,6 +71,8 @@ void free(void *ptr); > static size_t max_alloc_size= INT_MAX; > > > void av_max_alloc(size_t max){ > + if (max < 32) > + max = SIZE_MAX - 32 + max; /* be compatible to older(< 4.3) versions > */ > max_alloc_size = max; > } > > _______________________________________________ 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".
