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af_iucv: Move sockaddr length checks to before accessing sa_family in bind and connect handlers 

Verify that the caller-provided sockaddr structure is large enough to
contain the sa_family field, before accessing it in bind() and connect()
handlers of the AF_IUCV socket. Since neither syscall enforces a minimum
size of the corresponding memory region, very short sockaddrs (zero or
one byte long) result in operating on uninitialized memory while
referencing .sa_family.

Fixes: 52a82e23b9 ("af_iucv: Validate socket address length in iucv_sock_bind()")
Signed-off-by: Mateusz Jurczyk <mjurczyk@google.com>
[jwi: removed unneeded null-check for addr]
Signed-off-by: Julian Wiedmann <jwi@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Mateusz Jurczyk 2017-06-23 19:32:28 +02:00 committed by David S. Miller
parent 2e56c26b39
commit e3c42b61ff
1 changed files with 3 additions and 5 deletions
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8
net/iucv/af_iucv.c
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@ -715,10 +715,8 @@ static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr,
char uid[9];
/* Verify the input sockaddr */
if (!addr || addr->sa_family != AF_IUCV)
return -EINVAL;
if (addr_len < sizeof(struct sockaddr_iucv))
if (addr_len < sizeof(struct sockaddr_iucv) ||
addr->sa_family != AF_IUCV)
return -EINVAL;
lock_sock(sk);
@ -862,7 +860,7 @@ static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr,
struct iucv_sock *iucv = iucv_sk(sk);
int err;
if (addr->sa_family != AF_IUCV || alen < sizeof(struct sockaddr_iucv))
if (alen < sizeof(struct sockaddr_iucv) || addr->sa_family != AF_IUCV)
return -EINVAL;
if (sk->sk_state != IUCV_OPEN && sk->sk_state != IUCV_BOUND)