[FFmpeg-devel] [PATCH] fix crash in realmedia demuxer

Ronald S. Bultje rsbultje
Wed Dec 24 14:44:51 CET 2008

Hi Jai,

On Wed, Dec 24, 2008 at 1:26 AM, Jai Menon <jmenon86 at gmail.com> wrote:
> I don't know if I understood you correctly but I didn't remove any
> checks. The sample
> crashes with rmdec.c from svn head. I didn't explore further so don't
> know why that
> that check has no effect. From a brief glance, it seems that validity
> of sub_packet_size
> is not checked when the desc field is "dnet", that is AC3 streams.

All indeed correct, sorry for not noticing the dnet slip.

> So sub_packet_size is zero
> when parsing this packet and when the demuxer comes across a cook
> audio packet it blows up.
> Anyway, you might want to come up with a better analysis :-)

Just the obvious question, since I'm too lazy to test: does it work?
Might be worth testing cook-samples with a zero sub_packet_size and
see if these work. If so, you could remove the cook-check that I cited
above also. One of the .rm samples on mphq has a zero sub_packet_size.


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