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authorR. Parameswaran <parameswaran.r7@gmail.com>2017-04-12 18:31:04 -0700
committerDavid S. Miller <davem@davemloft.net>2017-04-17 13:01:48 -0400
commit57240d007816486131bee88cd474c2a71f0fe224 (patch)
treeeb6a94027fd814fd1a468ee127340b6201056bfd /net/l2tp/l2tp_eth.c
parent4a6e3c5def13c91adf2acc613837001f09af3baa (diff)
l2tp: device MTU setup, tunnel socket needs a lock
The MTU overhead calculation in L2TP device set-up merged via commit b784e7ebfce8cfb16c6f95e14e8532d0768ab7ff 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>
Diffstat (limited to 'net/l2tp/l2tp_eth.c')
-rw-r--r--net/l2tp/l2tp_eth.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/net/l2tp/l2tp_eth.c b/net/l2tp/l2tp_eth.c
index 138566a63123..b722d559c544 100644
--- a/net/l2tp/l2tp_eth.c
+++ b/net/l2tp/l2tp_eth.c
@@ -225,7 +225,9 @@ static void l2tp_eth_adjust_mtu(struct l2tp_tunnel *tunnel,
dev->needed_headroom += session->hdr_len;
return;
}
+ lock_sock(tunnel->sock);
l3_overhead = kernel_sock_ip_overhead(tunnel->sock);
+ release_sock(tunnel->sock);
if (l3_overhead == 0) {
/* L3 Overhead couldn't be identified, this could be
* because tunnel->sock was NULL or the socket's