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Don't attempt to create a voice frame on a read error

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Prior to this patch, a read error in snd_pcm_readi would still be treated as a
nominal result when constructing a voice frame from the expected data. Since
the value returned is negative, as opposed to the number of samples read,
this could result in a crash. With this patch, we now return a null frame
when a read error is detected.

Note that the patch on ASTERISK-21329 was modified slightly for this commit,
in that we bail immediately on detecting the read error, rather than bypassing
the construction of the voice frame.

(closes issue ASTERISK-21329)
Reported by: Keiichiro Kawasaki
patches:
  chan_alsa.diff uploaded by kawasaki (License 6489)


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.8@385633 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
Matthew Jordan
2013-04-14 02:21:30 +00:00
parent 7ff1e29675
commit a73ffd9d25
1 changed files with 7 additions and 0 deletions
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7
channels/chan_alsa.c
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@@ -482,6 +482,13 @@ static struct ast_frame *alsa_read(struct ast_channel *chan)
} else if (r >= 0) { } else if (r >= 0) {
off -= r; off -= r;
} }
/* Return NULL frame on error */
if (r < 0) {
ast_mutex_unlock(&alsalock);
return &f;
}
/* Update positions */ /* Update positions */
readpos += r; readpos += r;
left -= r; left -= r;