diff options
| author | Trond Myklebust <Trond.Myklebust@netapp.com> | 2012-11-08 10:01:26 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-01-17 08:50:50 -0800 |
| commit | c7cde2b3d27a5417021d7fc6da0f7941eab63769 (patch) | |
| tree | 631311ec7d39f6a50d4f4b7c147b60bf958bf065 /net | |
| parent | 297456d8fe2b141f0f05b5d6ff48a4cd0b5f5889 (diff) | |
SUNRPC: Fix validity issues with rpc_pipefs sb->s_fs_info
commit 642fe4d00db56d65060ce2fd4c105884414acb16 upstream.
rpc_kill_sb() must defer calling put_net() until after the notifier
has been called, since most (all?) of the notifier callbacks assume
that sb->s_fs_info points to a valid net namespace. It also must not
call put_net() if the call to rpc_fill_super was unsuccessful.
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=48421
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Cc: Stanislav Kinsbursky <skinsbursky@parallels.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net')
| -rw-r--r-- | net/sunrpc/rpc_pipe.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/net/sunrpc/rpc_pipe.c b/net/sunrpc/rpc_pipe.c index faa078f74b2..b8bda4434c0 100644 --- a/net/sunrpc/rpc_pipe.c +++ b/net/sunrpc/rpc_pipe.c @@ -1157,14 +1157,19 @@ static void rpc_kill_sb(struct super_block *sb) struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); mutex_lock(&sn->pipefs_sb_lock); + if (sn->pipefs_sb != sb) { + mutex_unlock(&sn->pipefs_sb_lock); + goto out; + } sn->pipefs_sb = NULL; mutex_unlock(&sn->pipefs_sb_lock); - put_net(net); dprintk("RPC: sending pipefs UMOUNT notification for net %p%s\n", net, NET_NAME(net)); blocking_notifier_call_chain(&rpc_pipefs_notifier_list, RPC_PIPEFS_UMOUNT, sb); + put_net(net); +out: kill_litter_super(sb); } |