[NET]: Make sure sockets implement splice_read

Fixes a segmentation fault when trying to splice from a non-TCP socket.

Signed-off-by: Rémi Denis-Courmont <rdenis@simphalempin.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 0 deletions

diff --git a/net/socket.c b/net/socket.c
index 7651de008502..b6d35cd72a50 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -701,6 +701,9 @@ static ssize_t sock_splice_read(struct file *file, loff_t *ppos,
 {
         struct socket *sock = file->private_data;
 
+        if (unlikely(!sock->ops->splice_read))
+                return -EINVAL;
+
         return sock->ops->splice_read(sock, ppos, pipe, len, flags);
 }