netlink: fix error propagation in netlink_mmap()

Return the error if something went wrong instead of unconditionally
returning 0.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 1 insertions, 1 deletions

diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c
index d0b3dd60d386..57ee84d21470 100644
--- a/net/netlink/af_netlink.c
+++ b/net/netlink/af_netlink.c
@@ -371,7 +371,7 @@ static int netlink_mmap(struct file *file, struct socket *sock,
         err = 0;
 out:
         mutex_unlock(&nlk->pg_vec_lock);
-        return 0;
+        return err;
 }
 
 static void netlink_frame_flush_dcache(const struct nl_mmap_hdr *hdr)