| From | Greg Kroah-Hartman <> | Subject | [ 060/221] SUNRPC: Fix validity issues with rpc_pipefs sb->s_fs_info | Date | Tue, 15 Jan 2013 10:49:47 -0800 |
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3.7-stable review patch. If anyone has any objections, please let me know.
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From: Trond Myklebust <Trond.Myklebust@netapp.com>
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>
--- net/sunrpc/rpc_pipe.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-)
--- a/net/sunrpc/rpc_pipe.c +++ b/net/sunrpc/rpc_pipe.c @@ -1152,14 +1152,19 @@ static void rpc_kill_sb(struct super_blo 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); }
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