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| author | R. Parameswaran <parameswaran.r7@gmail.com> | 2017-04-12 18:31:04 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-04-17 13:01:48 -0400 |
| commit | 57240d007816486131bee88cd474c2a71f0fe224 (patch) | |
| tree | eb6a94027fd814fd1a468ee127340b6201056bfd /net/l2tp | |
| parent | 4a6e3c5def13c91adf2acc613837001f09af3baa (diff) | |
| download | linux-stable-57240d007816486131bee88cd474c2a71f0fe224.tar.gz linux-stable-57240d007816486131bee88cd474c2a71f0fe224.tar.bz2 linux-stable-57240d007816486131bee88cd474c2a71f0fe224.zip | |
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')
| -rw-r--r-- | net/l2tp/l2tp_eth.c | 2 |
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 |