diff options
| author | NeilBrown <neilb@suse.de> | 2020-05-09 00:25:11 +0300 |
|---|---|---|
| committer | Trond Myklebust <trond.myklebust@hammerspace.com> | 2020-05-11 02:44:56 +0300 |
| commit | 31e9a7f353526bbe53165a292f8ea9695ead3168 (patch) | |
| tree | 4339dc18ed5b5290b666579f6c92f6167f14043e /net/sunrpc/clnt.c | |
| parent | 2ef96a5bb12be62ef75b5828c0aab838ebb29cb8 (diff) | |
| download | linux-31e9a7f353526bbe53165a292f8ea9695ead3168.tar.xz | |
SUNRPC: fix use-after-free in rpc_free_client_work()
Parts of rpc_free_client() were recently moved to
a separate rpc_free_clent_work(). This introduced
a use-after-free as rpc_clnt_remove_pipedir() calls
rpc_net_ns(), and that uses clnt->cl_xprt which has already
been freed.
So move the call to xprt_put() after the call to
rpc_clnt_remove_pipedir().
Reported-by: syzbot+22b5ef302c7c40d94ea8@syzkaller.appspotmail.com
Fixes: 7c4310ff5642 ("SUNRPC: defer slow parts of rpc_free_client() to a workqueue.")
Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Diffstat (limited to 'net/sunrpc/clnt.c')
| -rw-r--r-- | net/sunrpc/clnt.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/net/sunrpc/clnt.c b/net/sunrpc/clnt.c index 8350d3a2e9a7..8d3972ea688b 100644 --- a/net/sunrpc/clnt.c +++ b/net/sunrpc/clnt.c @@ -890,6 +890,7 @@ static void rpc_free_client_work(struct work_struct *work) */ rpc_clnt_debugfs_unregister(clnt); rpc_clnt_remove_pipedir(clnt); + xprt_put(rcu_dereference_raw(clnt->cl_xprt)); kfree(clnt); rpciod_down(); @@ -907,7 +908,6 @@ rpc_free_client(struct rpc_clnt *clnt) rpc_unregister_client(clnt); rpc_free_iostats(clnt->cl_metrics); clnt->cl_metrics = NULL; - xprt_put(rcu_dereference_raw(clnt->cl_xprt)); xprt_iter_destroy(&clnt->cl_xpi); put_cred(clnt->cl_cred); rpc_free_clid(clnt); |