diff options
| author | Mateusz Jurczyk <mjurczyk@google.com> | 2017-06-23 19:32:28 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-06-25 11:42:58 -0400 |
| commit | e3c42b61ff813921ba58cfc0019e3fd63f651190 (patch) | |
| tree | ee58efff6351bd05c142d03fe1a4e8f1b10afdab /net/iucv | |
| parent | 2e56c26b391810461170547509649f0c11717f65 (diff) | |
| download | lwn-e3c42b61ff813921ba58cfc0019e3fd63f651190.tar.gz lwn-e3c42b61ff813921ba58cfc0019e3fd63f651190.zip | |
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: 52a82e23b9f2 ("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>
Diffstat (limited to 'net/iucv')
| -rw-r--r-- | net/iucv/af_iucv.c | 8 |
1 files changed, 3 insertions, 5 deletions
diff --git a/net/iucv/af_iucv.c b/net/iucv/af_iucv.c index 05112094d76b..ac033e413bc5 100644 --- a/net/iucv/af_iucv.c +++ b/net/iucv/af_iucv.c @@ -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) |