From 7b6962b0a6000df48c8a5fd967d262f77704101b Mon Sep 17 00:00:00 2001
From: Trond Myklebust <Trond.Myklebust@netapp.com>
Date: Thu, 17 Apr 2008 16:53:01 -0400
Subject: [PATCH] SUNRPC: Fix a race in gss_refresh_upcall()
If the downcall completes before we get the spin_lock then we currently
fail to refresh the credential.
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
---
net/sunrpc/auth_gss/auth_gss.c | 11 ++++++++---
1 file changed, 8 insertions(+), 3 deletions(-)
diff --git a/net/sunrpc/auth_gss/auth_gss.c b/net/sunrpc/auth_gss/auth_gss.c
index 46f7ec800af9..6f1b4e2f5e81 100644
--- a/net/sunrpc/auth_gss/auth_gss.c
+++ b/net/sunrpc/auth_gss/auth_gss.c
@@ -117,6 +117,7 @@ gss_cred_set_ctx(struct rpc_cred *cred, struct gss_cl_ctx *ctx)
struct gss_cl_ctx *old;
old = gss_cred->gc_ctx;
+ gss_get_ctx(ctx);
rcu_assign_pointer(gss_cred->gc_ctx, ctx);
set_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
clear_bit(RPCAUTH_CRED_NEW, &cred->cr_flags);
@@ -340,7 +341,7 @@ gss_upcall_callback(struct rpc_task *task)
spin_lock(&inode->i_lock);
if (gss_msg->ctx)
- gss_cred_set_ctx(task->tk_msg.rpc_cred, gss_get_ctx(gss_msg->ctx));
+ gss_cred_set_ctx(task->tk_msg.rpc_cred, gss_msg->ctx);
else
task->tk_status = gss_msg->msg.errno;
gss_cred->gc_upcall = NULL;
@@ -417,7 +418,11 @@ gss_refresh_upcall(struct rpc_task *task)
spin_lock(&inode->i_lock);
if (gss_cred->gc_upcall != NULL)
rpc_sleep_on(&gss_cred->gc_upcall->rpc_waitqueue, task, NULL);
- else if (gss_msg->ctx == NULL && gss_msg->msg.errno >= 0) {
+ else if (gss_msg->ctx != NULL) {
+ gss_cred_set_ctx(task->tk_msg.rpc_cred, gss_msg->ctx);
+ gss_cred->gc_upcall = NULL;
+ rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno);
+ } else if (gss_msg->msg.errno >= 0) {
task->tk_timeout = 0;
gss_cred->gc_upcall = gss_msg;
/* gss_upcall_callback will release the reference to gss_upcall_msg */
@@ -462,7 +467,7 @@ gss_create_upcall(struct gss_auth *gss_auth, struct gss_cred *gss_cred)
schedule();
}
if (gss_msg->ctx)
- gss_cred_set_ctx(cred, gss_get_ctx(gss_msg->ctx));
+ gss_cred_set_ctx(cred, gss_msg->ctx);
else
err = gss_msg->msg.errno;
spin_unlock(&inode->i_lock);
--
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