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prevent double masqurading channels when one is been hung up and deadlock avoidance is used.

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There is a race condition in ast_do_masquerade / ast_hangup (at least)

Reported by me signed off by schmidts with input from David Vossel

Review: https://reviewboard.asterisk.org/r/1323/


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.8@330311 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
Gregory Nietsky
2011-07-30 15:25:16 +00:00
parent 41e6e3ab55
commit 842ab32ecc
1 changed files with 9 additions and 1 deletions
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10
main/channel.c
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@@ -6320,10 +6320,18 @@ int ast_do_masquerade(struct ast_channel *original)
* for deadlock avoidance will not result in any sort of masquerade race condition.
* If masq is called by a different thread while this happens, it will be stuck waiting
* until we unlock the container. */
while (ast_channel_trylock(clonechan)) {
while ((clonechan = original->masq) && ast_channel_trylock(clonechan)) {
CHANNEL_DEADLOCK_AVOIDANCE(original);
}
/* recheck if masq has been done the deadlock avoidance above could cause a double masq
* this is posible with at least ast_hangup*/
if (!original->masq) {
ast_channel_unlock(original);
ao2_unlock(channels);
return 0; /* masq already completed by another thread, or never needed to be done to begin with */
}
/* Get any transfer masquerade connected line exchange data. */
xfer_ds = ast_channel_datastore_find(original, &xfer_ds_info, NULL);
if (xfer_ds) {