lagarith: deadlock with fuzzed file

[ami_stuff]

​http://www1.datafilehost.com/d/3bdcfcb5

(gdb) r -threads 1 -i ./lag_dead.avi -an -f null -
Starting program: /media/sdb1/ffmpeg-HEAD-93439e8/ffmpeg_g -threads 1 -i ./lag_dead.avi -an -f null -
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/i386-linux-gnu/libthread_db.so.1".
ffmpeg version 2.0-93439e8 Copyright (c) 2000-2013 the FFmpeg developers
  built on Sep 18 2013 23:23:15 with gcc 4.7 (Debian 4.7.2-5)
  configuration: --disable-yasm --enable-gpl --disable-ffprobe --disable-ffserver
  libavutil      52. 44.100 / 52. 44.100
  libavcodec     55. 31.101 / 55. 31.101
  libavformat    55. 18.100 / 55. 18.100
  libavdevice    55.  3.100 / 55.  3.100
  libavfilter     3. 86.101 /  3. 86.101
  libswscale      2.  5.100 /  2.  5.100
  libswresample   0. 17.103 /  0. 17.103
  libpostproc    52.  3.100 / 52.  3.100
Input #0, avi, from './lag_dead.avi':
  Duration: 00:00:12.64, start: 0.000000, bitrate: 11792 kb/s
    Stream #0:0: Video: lagarith (LAGS / 0x5347414C), rgb24, 320x240, 23.97 tbr, 23.97 tbn, 23.97 tbc
    Stream #0:1: Audio: mp3 (U[0][0][0] / 0x0055), 44100 Hz, stereo, s16p, 128 kb/s
[New Thread 0xb7df8b70 (LWP 29348)]
[New Thread 0xb75f8b70 (LWP 29358)]
[New Thread 0xb6df8b70 (LWP 29359)]
[New Thread 0xb65f8b70 (LWP 29360)]
[New Thread 0xb5df8b70 (LWP 29361)]
[New Thread 0xb55f8b70 (LWP 29362)]
[New Thread 0xb4df8b70 (LWP 29363)]
[New Thread 0xb45f8b70 (LWP 29364)]
[New Thread 0xb3df8b70 (LWP 29365)]
Output #0, null, to 'pipe:':
  Metadata:
    encoder         : Lavf55.18.100
    Stream #0:0: Video: rawvideo (RGB[24] / 0x18424752), rgb24, 320x240, q=2-31, 200 kb/s, 90k tbn, 23.97 tbc
Stream mapping:
  Stream #0:0 -> #0:0 (lagarith -> rawvideo)
Press [q] to stop, [?] for help
[null @ 0x912d660] Encoder did not produce proper pts, making some up.
[lagarith @ 0x9115700] Output more bytes than length (37782 of 19423)
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Program received signal SIGINT, Interrupt.
lag_read_prob_header (gb=0xbfffec44, rac=0xbfffec58)
    at libavcodec/lagarith.c:194
194	            if (rac->prob[i]) {
(gdb) bt
#0  lag_read_prob_header (gb=0xbfffec44, rac=0xbfffec58)
    at libavcodec/lagarith.c:194
#1  lag_decode_arith_plane (l=l@entry=0x912eca0, 
    dst=0x9191920 "\b\b\n\v\r\r\f\f\f\f\f\r\f\r", '\n' <repeats 18 times>, "\f\f\f\f\f\f\f\f\v\v\f\v\v\v", '\f' <repeats 16 times>, "\v\f\f\f\f\f", '\v' <repeats 24 times>, "\016\016\016\016\016\016\016\016\017\017\017\016\016\017\f\f\016\017", '\016' <repeats 18 times>, "\r\r\r\r\r\r\r\r\r\r\017\017\017\017\017\017\016\016\016\016\016\016\016\016\r\r\v\v\v\v\v\v", '\r' <repeats 15 times>, "\016\r\r\r\r\016", '\r' <repeats 14 times>, "\f\f\f\017\017"..., width=320, 
    height=240, stride=-320, 
    src=src@entry=0x91d4ee0 "\003\357", <incomplete sequence \341>, 
    src_size=15455) at libavcodec/lagarith.c:437
#2  0x0851e751 in lag_decode_frame (avctx=0x9115700, data=0x912fe80, 
    got_frame=0xbffff4e4, avpkt=0xbffff288) at libavcodec/lagarith.c:616
#3  0x0867a5de in avcodec_decode_video2 (avctx=0x9115700, 
    picture=picture@entry=0x912fe80, 
    got_picture_ptr=got_picture_ptr@entry=0xbffff4e4, 
    avpkt=avpkt@entry=0xbffff730) at libavcodec/utils.c:1995
#4  0x080b394d in decode_video (ist=ist@entry=0x91194a0, 
    pkt=pkt@entry=0xbffff730, got_output=got_output@entry=0xbffff4e4)
    at ffmpeg.c:1668
#5  0x080b786a in output_packet (pkt=0xbffff6c8, ist=0x91194a0)
    at ffmpeg.c:1866
---Type <return> to continue, or q <return> to quit---
#6  process_input (file_index=2) at ffmpeg.c:3089
#7  0x080a3043 in transcode_step () at ffmpeg.c:3185
#8  transcode () at ffmpeg.c:3237
#9  main (argc=<optimized out>, argv=<optimized out>) at ffmpeg.c:3415
(gdb) 

[Michael Niedermayer]

Fixed in 45f0623ae3fabfb4be18fe3e81390e78717f3cd0