multipartdemux: segfault

Submitted by Nicola @drakkan

Link to original bug (#659573)

Description

I have the following segfault with multipartdemux:

Program received signal SIGSEGV, Segmentation fault.  
[Switching to Thread 0x7fffeaed8700 (LWP 15906)]  
0x00007ffff7211c60 in g_str_hash () from /lib/x86_64-linux-gnu/libglib-2.0.so.0  
(gdb) bt  
#0  0x00007ffff7211c60 in g_str_hash ()  
   from /lib/x86_64-linux-gnu/libglib-2.0.so.0  
#1  0x00007ffff71def6d in g_hash_table_lookup ()  
   from /lib/x86_64-linux-gnu/libglib-2.0.so.0  
#2  0x00007ffff44d97be in gst_multipart_demux_get_gstname (  
    pad=<value optimized out>, buf=<value optimized out>)  
    at multipartdemux.c:246  
#3  gst_multipart_find_pad_by_mime (pad=<value optimized out>,   
    buf=<value optimized out>) at multipartdemux.c:323  
#4  gst_multipart_demux_chain (pad=<value optimized out>,   
    buf=<value optimized out>) at multipartdemux.c:589  
#5  0x00007ffff7b57d0a in gst_pad_push (pad=0x7e4020, buffer=0x768180)  
    at gstpad.c:4710  
#6  0x00007ffff50ce29a in gst_base_src_loop (pad=0x7e4020) at gstbasesrc.c:2552  
#7  0x00007ffff7b7d61d in gst_task_func (task=0x6e7060) at gsttask.c:318  
#8  0x00007ffff7219b16 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0  
#9  0x00007ffff72173e4 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0  
#10 0x00007ffff6b89d8c in start_thread (arg=0x7fffeaed8700)  
    at pthread_create.c:304  
#11 0x00007ffff68d504d in clone ()  
    at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112  
#12 0x0000000000000000 in ?? ()  

attacched is a dump of the stream that generate the problem, you can reproduce with:

gst-launch filesrc location=... ! multipartdemux ! ...

the stream is supposed to be audio/x-raw-int, rate=8000,channels=1,endianness=1234,width=16,depth=16,signed=true