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l2tp: device MTU setup, tunnel socket needs a lock

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The MTU overhead calculation in L2TP device set-up
merged via commit b784e7ebfc
needs to be adjusted to lock the tunnel socket while
referencing the sub-data structures to derive the
socket's IP overhead.

Reported-by: Guillaume Nault <g.nault@alphalink.fr>
Tested-by: Guillaume Nault <g.nault@alphalink.fr>
Signed-off-by: R. Parameswaran <rparames@brocade.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
R. Parameswaran 2017-04-12 18:31:04 -07:00 • committed by David S. Miller
parent 4a6e3c5def
commit 57240d0078
3 changed files with 4 additions and 2 deletions
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2
include/linux/net.h
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@ -298,7 +298,7 @@ int kernel_sendpage(struct socket *sock, struct page *page, int offset,
int kernel_sock_ioctl(struct socket *sock, int cmd, unsigned long arg);
int kernel_sock_shutdown(struct socket *sock, enum sock_shutdown_cmd how);
/* Following routine returns the IP overhead imposed by a socket. */
/* Routine returns the IP overhead imposed by a (caller-protected) socket. */
u32 kernel_sock_ip_overhead(struct sock *sk);
#define MODULE_ALIAS_NETPROTO(proto) \