diff options
| author | Trond Myklebust <Trond.Myklebust@netapp.com> | 2012-11-08 19:01:26 +0400 |
|---|---|---|
| committer | Trond Myklebust <Trond.Myklebust@netapp.com> | 2012-11-08 23:53:28 +0400 |
| commit | 642fe4d00db56d65060ce2fd4c105884414acb16 (patch) | |
| tree | 49d4b27e67b129dec2b1c102af9e6365466880c3 /net/sunrpc | |
| parent | 0e4a43ed08e2f44aa7b96aa95d0a540d675483e1 (diff) | |
| download | linux-642fe4d00db56d65060ce2fd4c105884414acb16.tar.xz | |
SUNRPC: Fix validity issues with rpc_pipefs sb->s_fs_info
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>
Cc: stable@vger.kernel.org [>= v3.4]
Diffstat (limited to 'net/sunrpc')
| -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 80f5dd23417d..e659def77742 100644 --- a/net/sunrpc/rpc_pipe.c +++ b/net/sunrpc/rpc_pipe.c @@ -1152,14 +1152,19 @@ 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); } |