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On busy systems, it's possible for the values checked within a single line

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of code to change, unless the structure is locked to ensure a consistent
state.
(closes issue #13717)
 Reported by: kowalma
 Patches: 
       20081102__bug13717.diff.txt uploaded by Corydon76 (license 14)
 Tested by: kowalma


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@154365 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
Tilghman Lesher
2008-11-04 20:49:33 +00:00
parent f7c8bfed9c
commit 537f626328
1 changed files with 9 additions and 0 deletions
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9
channels/chan_iax2.c
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@@ -1558,12 +1558,21 @@ static int __find_callno(unsigned short callno, unsigned short dcallno, struct s
/* This will occur on the first response to a message that we initiated,
* such as a PING. */
if (dcallno) {
ast_mutex_lock(&iaxsl[dcallno]);
}
if (callno && dcallno && iaxs[dcallno] && !iaxs[dcallno]->peercallno && match(sin, callno, dcallno, iaxs[dcallno], check_dcallno)) {
iaxs[dcallno]->peercallno = callno;
res = dcallno;
store_by_peercallno(iaxs[dcallno]);
if (!res || !return_locked) {
ast_mutex_unlock(&iaxsl[dcallno]);
}
return res;
}
if (dcallno) {
ast_mutex_unlock(&iaxsl[dcallno]);
}
#ifdef IAX_OLD_FIND
/* If we get here, we SHOULD NOT find a call structure for this