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authorGreg Kroah-Hartman <gregkh@linuxfoundation.org>2019-02-12 21:27:34 +0300
committerAnna Schumaker <Anna.Schumaker@Netapp.com>2019-02-12 23:51:39 +0300
commitad6fef776927b4172e55a1bd97b3cd441a0c261c (patch)
treeed3438b4e7702c396e41c778b3fe7c195c6f8429 /net/sunrpc
parenta4cb5bdb754afe21f3e9e7164213e8600cf69427 (diff)
downloadlinux-ad6fef776927b4172e55a1bd97b3cd441a0c261c.tar.xz
rpc: properly check debugfs dentry before using it
debugfs can now report an error code if something went wrong instead of just NULL. So if the return value is to be used as a "real" dentry, it needs to be checked if it is an error before dereferencing it. This is now happening because of ff9fb72bc077 ("debugfs: return error values, not NULL"), but why debugfs files are not being created properly is an older issue, probably one that has always been there and should probably be looked at... Cc: "J. Bruce Fields" <bfields@fieldses.org> Cc: Jeff Layton <jlayton@kernel.org> Cc: Trond Myklebust <trond.myklebust@hammerspace.com> Cc: Anna Schumaker <anna.schumaker@netapp.com> Cc: linux-nfs@vger.kernel.org Cc: netdev@vger.kernel.org Reported-by: David Howells <dhowells@redhat.com> Tested-by: David Howells <dhowells@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Diffstat (limited to 'net/sunrpc')
-rw-r--r--net/sunrpc/debugfs.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/net/sunrpc/debugfs.c b/net/sunrpc/debugfs.c
index 45a033329cd4..19bb356230ed 100644
--- a/net/sunrpc/debugfs.c
+++ b/net/sunrpc/debugfs.c
@@ -146,7 +146,7 @@ rpc_clnt_debugfs_register(struct rpc_clnt *clnt)
rcu_read_lock();
xprt = rcu_dereference(clnt->cl_xprt);
/* no "debugfs" dentry? Don't bother with the symlink. */
- if (!xprt->debugfs) {
+ if (IS_ERR_OR_NULL(xprt->debugfs)) {
rcu_read_unlock();
return;
}