diff options
| author | David S. Miller <davem@davemloft.net> | 2017-01-04 13:24:19 -0500 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-01-04 13:24:19 -0500 |
| commit | ac4340fc3ce0e0b1cb627b05d6dcbd473544d7b3 (patch) | |
| tree | 4987c1a7d7ce5273097bab8debde9ba2fde343ee /net/socket.c | |
| parent | 1ff8cebf49ed9e9ca2ae44b5c4176aef9c21af9c (diff) | |
| download | lwn-ac4340fc3ce0e0b1cb627b05d6dcbd473544d7b3.tar.gz lwn-ac4340fc3ce0e0b1cb627b05d6dcbd473544d7b3.zip | |
net: Assert at build time the assumptions we make about the CMSG header.
It must always be the case that CMSG_ALIGN(sizeof(hdr)) == sizeof(hdr).
Otherwise there are missing adjustments in the various calculations
that parse and build these things.
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/socket.c')
| -rw-r--r-- | net/socket.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/net/socket.c b/net/socket.c index 8487bf136e5c..5f3b5a2c4f37 100644 --- a/net/socket.c +++ b/net/socket.c @@ -1948,6 +1948,8 @@ static int ___sys_sendmsg(struct socket *sock, struct user_msghdr __user *msg, ctl_buf = msg_sys->msg_control; ctl_len = msg_sys->msg_controllen; } else if (ctl_len) { + BUILD_BUG_ON(sizeof(struct cmsghdr) != + CMSG_ALIGN(sizeof(struct cmsghdr))); if (ctl_len > sizeof(ctl)) { ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL); if (ctl_buf == NULL) |