diff options
| author | Trond Myklebust <Trond.Myklebust@netapp.com> | 2008-04-17 16:53:01 -0400 |
|---|---|---|
| committer | Trond Myklebust <Trond.Myklebust@netapp.com> | 2008-04-19 16:55:15 -0400 |
| commit | 7b6962b0a6000df48c8a5fd967d262f77704101b (patch) | |
| tree | 8902c9232242ac48c49f3e7a4ff0a94045974726 /net/sunrpc/auth_gss/auth_gss.c | |
| parent | 7c1d71cf56feebfb5b98219b9d11dfc3a2feca62 (diff) | |
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>
Diffstat (limited to 'net/sunrpc/auth_gss/auth_gss.c')
| -rw-r--r-- | net/sunrpc/auth_gss/auth_gss.c | 11 |
1 files 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); |