This is a note to let you know that I've just added the patch titled
SUNRPC: Ensure we release the socket write lock if the rpc_task exits early
to the 3.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
sunrpc-ensure-we-release-the-socket-write-lock-if-the-rpc_task-exits-early.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 87ed50036b866db2ec2ba16b2a7aec4a2b0b7c39 Mon Sep 17 00:00:00 2001
From: Trond Myklebust <[email protected]>
Date: Mon, 7 Jan 2013 14:30:46 -0500
Subject: SUNRPC: Ensure we release the socket write lock if the rpc_task exits
early
From: Trond Myklebust <[email protected]>
commit 87ed50036b866db2ec2ba16b2a7aec4a2b0b7c39 upstream.
If the rpc_task exits while holding the socket write lock before it has
allocated an rpc slot, then the usual mechanism for releasing the write
lock in xprt_release() is defeated.
The problem occurs if the call to xprt_lock_write() initially fails, so
that the rpc_task is put on the xprt->sending wait queue. If the task
exits after being assigned the lock by __xprt_lock_write_func, but
before it has retried the call to xprt_lock_and_alloc_slot(), then
it calls xprt_release() while holding the write lock, but will
immediately exit due to the test for task->tk_rqstp != NULL.
Reported-by: Chris Perl <[email protected]>
Signed-off-by: Trond Myklebust <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
net/sunrpc/sched.c | 3 +--
net/sunrpc/xprt.c | 12 ++++++++++--
2 files changed, 11 insertions(+), 4 deletions(-)
--- a/net/sunrpc/sched.c
+++ b/net/sunrpc/sched.c
@@ -953,8 +953,7 @@ static void rpc_async_release(struct wor
static void rpc_release_resources_task(struct rpc_task *task)
{
- if (task->tk_rqstp)
- xprt_release(task);
+ xprt_release(task);
if (task->tk_msg.rpc_cred) {
put_rpccred(task->tk_msg.rpc_cred);
task->tk_msg.rpc_cred = NULL;
--- a/net/sunrpc/xprt.c
+++ b/net/sunrpc/xprt.c
@@ -1139,10 +1139,18 @@ static void xprt_request_init(struct rpc
void xprt_release(struct rpc_task *task)
{
struct rpc_xprt *xprt;
- struct rpc_rqst *req;
+ struct rpc_rqst *req = task->tk_rqstp;
- if (!(req = task->tk_rqstp))
+ if (req == NULL) {
+ if (task->tk_client) {
+ rcu_read_lock();
+ xprt = rcu_dereference(task->tk_client->cl_xprt);
+ if (xprt->snd_task == task)
+ xprt_release_write(xprt, task);
+ rcu_read_unlock();
+ }
return;
+ }
xprt = req->rq_xprt;
if (task->tk_ops->rpc_count_stats != NULL)
Patches currently in stable-queue which might be from
[email protected] are
queue-3.4/sunrpc-continue-run-over-clients-list-on-pipefs-event-instead-of-break.patch
queue-3.4/sunrpc-ensure-that-we-free-the-rpc_task-after-cleanups-are-done.patch
queue-3.4/sunrpc-ensure-we-release-the-socket-write-lock-if-the-rpc_task-exits-early.patch
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