NFS: Fix use-after-free in nfs4_init_client()

commit 476bdb04c501fc64bf3b8464ffddefc8dbe01577 upstream.

KASAN reports a use-after-free when attempting to mount two different
exports through two different NICs that belong to the same server.

Olga was able to hit this with kernels starting somewhere between 5.7
and 5.10, but I traced the patch that introduced the clear_bit() call to
4.13. So something must have changed in the refcounting of the clp
pointer to make this call to nfs_put_client() the very last one.

Fixes: 8dcbec6d20 ("NFSv41: Handle EXCHID4_FLAG_CONFIRMED_R during NFSv4.1 migration")
Cc: stable@vger.kernel.org # 4.13+
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/nfs/nfs4client.c b/fs/nfs/nfs4client.c
index faaabbedc891d4e7fc1487cbff1695de25b3129e..b5ce70c4ec87f37d02077324233ee1ec9a7a9dd6 100644 (file)
--- a/fs/nfs/nfs4client.c
+++ b/fs/nfs/nfs4client.c
@@ -431,8 +431,8 @@ struct nfs_client *nfs4_init_client(struct nfs_client *clp,
                 */
                nfs_mark_client_ready(clp, -EPERM);
        }
-       nfs_put_client(clp);
        clear_bit(NFS_CS_TSM_POSSIBLE, &clp->cl_flags);
+       nfs_put_client(clp);
        return old;
 
 error: