[FFmpeg-trac] #2139(avformat:open): Crash on invalid command-line

[FFmpeg]

#2139: Crash on invalid command-line
-------------------------------------+-------------------------------------
             Reporter:  cehoyos      |                    Owner:
                 Type:  defect       |                   Status:  open
             Priority:  important    |                Component:  avformat
              Version:  git-master   |               Resolution:
             Keywords:  crash        |               Blocked By:
  SIGSEGV                            |  Reproduced by developer:  1
             Blocking:               |
Analyzed by developer:  0            |
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Comment (by pk_hariprasad):

 For out.bmp, h->prot looks like
 $3 = {name = 0xc872d1 "file", url_open = 0x5402c0 <file_open>,
   url_open2 = 0x0, url_read = 0x5404a0 <file_read>,
   url_write = 0x540460 <file_write>, url_seek = 0x540220 <file_seek>,
   url_close = 0x540200 <file_close>, next = 0xc33d20, url_read_pause =
 0x0,
   url_read_seek = 0x0, url_get_file_handle = 0x540150 <file_get_handle>,
   url_get_multi_file_handle = 0x0, url_shutdown = 0x0, priv_data_size =
 12,
   priv_data_class = 0xc872e0, flags = 0, url_check = 0x5403c0
 <file_check>}

 For concat:out.bmp, it looks like
 $1 = {name = 0xc86eba "concat", url_open = 0xbe5038 <concat_open>,
   url_open2 = 0x0, url_read = 0x53f510 <concat_read>, url_write = 0x0,
   url_seek = 0x53f280 <concat_seek>, url_close = 0xbe4ff4 <concat_close>,
   next = 0xc33b40, url_read_pause = 0x0, url_read_seek = 0x0,
   url_get_file_handle = 0x0, url_get_multi_file_handle = 0x0,
   url_shutdown = 0x0, priv_data_size = 12, priv_data_class = 0x0, flags =
 0,
   url_check = 0x0}

 Since url_write is NULL, it causes seg fault in function
 retry_transfer_wrapper where its passed as param.

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Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2139#comment:2>
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