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SUNRPC: prevent task_cleanup running on freed xprt

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We saw a report of a NULL dereference in xprt_autoclose:

	https://bugzilla.redhat.com/show_bug.cgi?id=611938

This appears to be the result of an xprt's task_cleanup running after
the xprt is destroyed.  Nothing in the current code appears to prevent
that.

Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
J. Bruce Fields 2010-08-03 17:22:20 -04:00 committed by Trond Myklebust
parent d6a1ed08c6
commit c3ae62ae08
1 changed files with 1 additions and 0 deletions
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net/sunrpc/xprt.c
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@ -1131,6 +1131,7 @@ static void xprt_destroy(struct kref *kref)
rpc_destroy_wait_queue(&xprt->sending);
rpc_destroy_wait_queue(&xprt->resend);
rpc_destroy_wait_queue(&xprt->backlog);
cancel_work_sync(&xprt->task_cleanup);
/*
* Tear down transport state and free the rpc_xprt
*/