syzbot is reporting uninitialized value at rds_connect() [1] and
rds_bind() [2]. This is because syzbot is passing ulen == 0 whereas
these functions expect that it is safe to access sockaddr->family field
in order to determine minimal address length for validation.

[1] 
https://syzkaller.appspot.com/bug?id=f4e61c010416c1e6f0fa3ffe247561b60a50ad71
[2] 
https://syzkaller.appspot.com/bug?id=a4bf9e41b7e055c3823fdcd83e8c58ca7270e38f

Reported-by: syzbot <syzbot+0049bebbf3042dbd2...@syzkaller.appspotmail.com>
Reported-by: syzbot <syzbot+915c9f99f3dbc4bd6...@syzkaller.appspotmail.com>
Signed-off-by: Tetsuo Handa <penguin-ker...@i-love.sakura.ne.jp>
---
 net/rds/af_rds.c | 3 +++
 net/rds/bind.c   | 2 ++
 2 files changed, 5 insertions(+)

diff --git a/net/rds/af_rds.c b/net/rds/af_rds.c
index d6cc97fbbbb0..2b969f99ef13 100644
--- a/net/rds/af_rds.c
+++ b/net/rds/af_rds.c
@@ -543,6 +543,9 @@ static int rds_connect(struct socket *sock, struct sockaddr 
*uaddr,
        struct rds_sock *rs = rds_sk_to_rs(sk);
        int ret = 0;
 
+       if (addr_len < offsetofend(struct sockaddr, sa_family))
+               return -EINVAL;
+
        lock_sock(sk);
 
        switch (uaddr->sa_family) {
diff --git a/net/rds/bind.c b/net/rds/bind.c
index 17c9d9f0c848..0f4398e7f2a7 100644
--- a/net/rds/bind.c
+++ b/net/rds/bind.c
@@ -173,6 +173,8 @@ int rds_bind(struct socket *sock, struct sockaddr *uaddr, 
int addr_len)
        /* We allow an RDS socket to be bound to either IPv4 or IPv6
         * address.
         */
+       if (addr_len < offsetofend(struct sockaddr, sa_family))
+               return -EINVAL;
        if (uaddr->sa_family == AF_INET) {
                struct sockaddr_in *sin = (struct sockaddr_in *)uaddr;
 
-- 
2.16.5

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