NFSv4: Fix an Oops in nfs4_do_setattr

If the user specifies an open mode of 3, then we don't have a NFSv4 state
attached to the context, and so we Oops when we try to dereference it.

Reported-by: Olga Kornievskaia <aglo@umich.edu>
Fixes: 29b59f9416937 ("NFSv4: change nfs4_do_setattr to take...")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Cc: stable@vger.kernel.org # v4.10: 991eedb1371dc: NFSv4: Only pass the...
Cc: stable@vger.kernel.org # v4.10+

diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 3e0b93f2b61a284140e31d46ccd39b13d72c1b8e..12b2b65ad8a8294e210460d23a4de2ca747d04c4 100644 (file)
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -3214,7 +3214,7 @@ static int _nfs4_do_setattr(struct inode *inode,
 
        if (nfs4_copy_delegation_stateid(inode, FMODE_WRITE, &arg->stateid, &delegation_cred)) {
                /* Use that stateid */
-       } else if (ctx != NULL) {
+       } else if (ctx != NULL && ctx->state) {
                struct nfs_lock_context *l_ctx;
                if (!nfs4_valid_open_stateid(ctx->state))
                        return -EBADF;