There's a race condition in gsttagdemux.c between typefinding and the end-of-stream event. If TYPE_FIND_MAX_SIZE is exceeded, demux->priv->collect is set to NULL and an error is returned. However, the end-of-stream event causes one last attempt at typefinding to occur.
This leads to gst_tag_demux_trim_buffer() being called with the NULL demux->priv->collect buffer which it attempts to dereference, resulting in a segfault.
The malicious MP3 can be created by:
"$(dd if=/dev/urandom bs=1K count=200)" > malicious.mp3
This creates a valid ID3 header which gets us as far as typefinding. The crash can then be reproduced with the following pipeline:
gst-launch-1.0 -e filesrc location=malicious.mp3 ! queue ! decodebin ! audioconvert ! vorbisenc ! oggmux ! filesink location=malicious.ogg
Fixes #967 (closed)