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SUNRPC: Fix a race in gss_refresh_upcall()

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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>
This commit is contained in:
Trond Myklebust 2008-04-17 16:53:01 -04:00
parent 7c1d71cf56
commit 7b6962b0a6
1 changed files with 8 additions and 3 deletions
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11
net/sunrpc/auth_gss/auth_gss.c
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@ -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);