#9906: flac parser asserts on flac file with large hole of zero bytes
-------------------------------------+-------------------------------------
Reporter: Mattias | Type: defect
Wadman |
Status: new | Priority: normal
Component: avcodec | Version: git-
| master
Keywords: | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
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Summary of the bug:
Corrupt flac files with large hole of zero bytes causes libavcodec flac
parser to assert.
How to reproduce:
{{{
# create a 540MB test file with a large (> 0x20000000) zero bytes hole in
the middle
$ ffmpeg -y -f lavfi -i anoisesrc -t 4000 test.flac
$ dd if=/dev/zero conv=notrunc of=test.flac oseek=20000 bs=1024
count=540000
# try decode it
$ ffmpeg -i test.flac -f null -
...
Assertion index > -0x20000000 failed at libavcodec/parser.c:165
}}}
Reproducible with 5.1.1 and master
(b881d2db8892e88a625dfa4ac2d5b8ca53ab9595)
The large negative error code seems to come here
https://github.com/FFmpeg/FFmpeg/blob/master/libavcodec/flac_parser.c#L653.
Based on the assert and comment in libavcodec/parser.c i get a feeling
there should be some limit on position delta or pos should be signalled in
some other way?
--
Ticket URL: <https://trac.ffmpeg.org/ticket/9906>
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