<html>
    <head>
      <base href="https://bugzilla.libav.org/" />
    </head>
    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - One null pointer deference in ff_vc1_parse_frame_header_adv in vc1.c"
   href="https://bugzilla.libav.org/show_bug.cgi?id=1136">1136</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>One null pointer deference  in ff_vc1_parse_frame_header_adv in vc1.c
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>Libav
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>12
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>X86
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>Linux
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>normal
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>---
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>libavcodec
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>bugzilla@libav.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>92wyunchao@gmail.com
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Created <span class=""><a href="attachment.cgi?id=721" name="attach_721" title="poc to reproduce the crash">attachment 721</a> <a href="attachment.cgi?id=721&action=edit" title="poc to reproduce the crash">[details]</a></span>
poc to reproduce the crash

$uname -a
Linux VM-0-9-ubuntu 4.4.0-91-generic #114-Ubuntu SMP Tue Aug 8 11:56:56 UTC
2017 x86_64 x86_64 x86_64 GNU/Linux

$ASAN_OPTIONS=halt_on_error=false:allow_addr2line=true ./avconv -i poc -f null
-

ASAN:DEADLYSIGNAL
=================================================================
==16226==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000000 (pc
0x0000016cf62c bp 0x7ffe63ae38d0 sp 0x7ffe63ae32e0 T0)
    #0 0x16cf62b in ff_vc1_parse_frame_header_adv
/home/ubuntu/asan/libav-12.3/libavcodec/vc1.c:848
    #1 0x177f7a0 in vc1_decode_frame
/home/ubuntu/asan/libav-12.3/libavcodec/vc1dec.c:762
    #2 0x16950f7 in avcodec_decode_video2
/home/ubuntu/asan/libav-12.3/libavcodec/utils.c:1588
    #3 0x1697c5b in do_decode
/home/ubuntu/asan/libav-12.3/libavcodec/utils.c:1727
    #4 0x16978b6 in avcodec_send_packet
/home/ubuntu/asan/libav-12.3/libavcodec/utils.c:1804
    #5 0x532ad1 in decode /home/ubuntu/asan/libav-12.3/avconv.c:1295
    #6 0x532ad1 in decode_video /home/ubuntu/asan/libav-12.3/avconv.c:1395
    #7 0x532ad1 in process_input_packet
/home/ubuntu/asan/libav-12.3/avconv.c:1514
    #8 0x52848d in process_input /home/ubuntu/asan/libav-12.3/avconv.c:2690
    #9 0x52848d in transcode /home/ubuntu/asan/libav-12.3/avconv.c:2732
    #10 0x52848d in main /home/ubuntu/asan/libav-12.3/avconv.c:2905
    #11 0x7f2636e2282f in __libc_start_main
/build/glibc-Cl5G7W/glibc-2.23/csu/../csu/libc-start.c:291
    #12 0x41a888 in _start (/home/ubuntu/asan/libav-12.3/avconv+0x41a888)

AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV
/home/ubuntu/asan/libav-12.3/libavcodec/vc1.c:848 in
ff_vc1_parse_frame_header_adv
==16226==ABORTING</pre>
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