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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 <[email protected]>
Tested-by: Guillaume Nault <[email protected]>
Signed-off-by: R. Parameswaran <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
R. Parameswaran 2017-04-12 18:31:04 -07:00 • committed by David S. Miller
commit 57240d0078
3 changed files with 4 additions and 2 deletions
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2
net/l2tp/l2tp_eth.c
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@ -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