can: Fix raw_getname() leak

raw_getname() can leak 10 bytes of kernel memory to user

(two bytes hole between can_family and can_ifindex,
8 bytes at the end of sockaddr_can structure)

Signed-off-by: Eric Dumazet <[email protected]>
Acked-by: Oliver Hartkopp <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

diff --git a/net/can/raw.c b/net/can/raw.c
index f4cc44548bdaa35a2b6947b8c7ef89affe8ac615..db3152df7d2b627fd2484c14734e9a084d3e93a0 100644 (file)
--- a/net/can/raw.c
+++ b/net/can/raw.c
@@ -401,6 +401,7 @@ static int raw_getname(struct socket *sock, struct sockaddr *uaddr,
        if (peer)
                return -EOPNOTSUPP;
 
+       memset(addr, 0, sizeof(*addr));
        addr->can_family  = AF_CAN;
        addr->can_ifindex = ro->ifindex;