[rtmpdump] librtmp potential segmentation fault

Howard Chu hyc at highlandsun.com
Tue Oct 28 16:09:38 CET 2014

Αθανάσιος Οικονόμου wrote:
> Hello,
> GStreamer uses librtmp on plugins bad rtmp and it seems that librtmp under
> some schenarios it fails with segmentation fault.
> Here is the description of one of the bugs related with that:
> "...a crash in rtmpsrc which happens due to RTMP_Close() being
> called in gst_rtmp_src_unlock() while RTMP_Read() is being run in
> gst_rtmp_src_create() in another thread. librtmp isn't thread safe so this case
> is bad."
> Is there any "safe" way to cleanup rtmp while read is going on?
> Here are the related bugs:
> https://bugzilla.gnome.org/show_bug.cgi?id=729099
> https://bugzilla.gnome.org/show_bug.cgi?id=739263

None of this is an RTMPdump issue. It's the responsibility of the plugin 
authors using librtmp to implement proper locking around librtmp calls - any 
RTMP session may only be used by a single thread at a time.

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