[NET]: Make sure ctl buffer is aligned properly in sys_sendmsg().

It's on the stack and declared as "unsigned char[]", but pointers
and similar can be in here thus we need to give it an explicit
alignment attribute.

Signed-off-by: Alex Williamson <alex.williamson@hp.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 1 deletions

diff --git a/net/socket.c b/net/socket.c
index f9264472377f..dbd1a6851edd 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -1700,7 +1700,9 @@ asmlinkage long sys_sendmsg(int fd, struct msghdr __user *msg, unsigned flags)
         struct socket *sock;
         char address[MAX_SOCK_ADDR];
         struct iovec iovstack[UIO_FASTIOV], *iov = iovstack;
-        unsigned char ctl[sizeof(struct cmsghdr) + 20]; /* 20 is size of ipv6_pktinfo */
+        unsigned char ctl[sizeof(struct cmsghdr) + 20]
+                        __attribute__ ((aligned (sizeof(__kernel_size_t))));
+                        /* 20 is size of ipv6_pktinfo */
         unsigned char *ctl_buf = ctl;
         struct msghdr msg_sys;
         int err, ctl_len, iov_size, total_len;