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authorMateusz Jurczyk <mjurczyk@google.com>2017-06-23 19:32:28 +0200
committerDavid S. Miller <davem@davemloft.net>2017-06-25 11:42:58 -0400
commite3c42b61ff813921ba58cfc0019e3fd63f651190 (patch)
treeee58efff6351bd05c142d03fe1a4e8f1b10afdab /net/iucv
parentnet/iucv: improve endianness handling (diff)
downloadlinux-dev-e3c42b61ff813921ba58cfc0019e3fd63f651190.tar.xz
linux-dev-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.c8
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)