From: Mateusz Jurczyk <mjurczyk@xxxxxxxxxx>
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@xxxxxxxxxx>
[jwi: removed unneeded null-check for addr]
Signed-off-by: Julian Wiedmann <jwi@xxxxxxxxxxxxxxxxxx>
---
net/iucv/af_iucv.c | 8 +++-----
1 file 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)
--
2.11.2
--
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