From df44f9f4f9b5d362b5a2d1c8444fe7e6d4c42653 Mon Sep 17 00:00:00 2001 From: David Howells Date: Fri, 6 Aug 2010 17:26:48 +0100 Subject: [PATCH] AFS: Fix the module init error handling Fix the module init error handling. There are a bunch of goto labels for aborting the init procedure at different points and just undoing what needs undoing - they aren't all in the right places, however. This can lead to an oops like the following: BUG: unable to handle kernel NULL pointer dereference at 0000000000000020 IP: [] destroy_workqueue+0x17/0xc0 ... Modules linked in: kafs(+) dns_resolver rxkad af_rxrpc fscache Pid: 2171, comm: insmod Not tainted 2.6.35-cachefs+ #319 DG965RY/ ... Process insmod (pid: 2171, threadinfo ffff88003ca6a000, task ffff88003dcc3050) ... Call Trace: [] afs_callback_update_kill+0x10/0x12 [kafs] [] afs_init+0x190/0x1ce [kafs] [] ? afs_init+0x0/0x1ce [kafs] [] do_one_initcall+0x59/0x14e [] sys_init_module+0x9c/0x1de [] system_call_fastpath+0x16/0x1b Signed-off-by: David Howells Signed-off-by: Linus Torvalds --- fs/afs/main.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) diff --git a/fs/afs/main.c b/fs/afs/main.c index 66d54d348c55..cfd1cbe25b22 100644 --- a/fs/afs/main.c +++ b/fs/afs/main.c @@ -111,6 +111,8 @@ static int __init afs_init(void) /* initialise the callback update process */ ret = afs_callback_update_init(); + if (ret < 0) + goto error_callback_update_init; /* create the RxRPC transport */ ret = afs_open_socket(); @@ -127,15 +129,16 @@ static int __init afs_init(void) error_fs: afs_close_socket(); error_open_socket: + afs_callback_update_kill(); +error_callback_update_init: + afs_vlocation_purge(); error_vl_update_init: + afs_cell_purge(); error_cell_init: #ifdef CONFIG_AFS_FSCACHE fscache_unregister_netfs(&afs_cache_netfs); error_cache: #endif - afs_callback_update_kill(); - afs_vlocation_purge(); - afs_cell_purge(); afs_proc_cleanup(); rcu_barrier(); printk(KERN_ERR "kAFS: failed to register: %d\n", ret); -- 2.20.1