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| author | Vegard Nossum <vegard.nossum@oracle.com> | 2016-07-05 10:18:08 +0200 |
|---|---|---|
| committer | Steffen Klassert <steffen.klassert@secunet.com> | 2016-07-18 09:37:02 +0200 |
| commit | 1ba5bf993c6a3142e18e68ea6452b347f9cb5635 (patch) | |
| tree | 50acfc1c0fc36a81964f600f505ec93be0e34f10 /net/xfrm/xfrm_user.c | |
| parent | 8e6ce7ebeb34f0992f56de078c3744fb383657fa (diff) | |
| download | linux-stable-1ba5bf993c6a3142e18e68ea6452b347f9cb5635.tar.gz linux-stable-1ba5bf993c6a3142e18e68ea6452b347f9cb5635.tar.bz2 linux-stable-1ba5bf993c6a3142e18e68ea6452b347f9cb5635.zip | |
xfrm: fix crash in XFRM_MSG_GETSA netlink handler
If we hit any of the error conditions inside xfrm_dump_sa(), then
xfrm_state_walk_init() never gets called. However, we still call
xfrm_state_walk_done() from xfrm_dump_sa_done(), which will crash
because the state walk was never initialized properly.
We can fix this by setting cb->args[0] only after we've processed the
first element and checking this before calling xfrm_state_walk_done().
Fixes: d3623099d3 ("ipsec: add support of limited SA dump")
Cc: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Cc: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: Vegard Nossum <vegard.nossum@oracle.com>
Acked-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Diffstat (limited to 'net/xfrm/xfrm_user.c')
| -rw-r--r-- | net/xfrm/xfrm_user.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c index d516845e16e3..4fb04ced5867 100644 --- a/net/xfrm/xfrm_user.c +++ b/net/xfrm/xfrm_user.c @@ -896,7 +896,8 @@ static int xfrm_dump_sa_done(struct netlink_callback *cb) struct sock *sk = cb->skb->sk; struct net *net = sock_net(sk); - xfrm_state_walk_done(walk, net); + if (cb->args[0]) + xfrm_state_walk_done(walk, net); return 0; } @@ -921,8 +922,6 @@ static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb) u8 proto = 0; int err; - cb->args[0] = 1; - err = nlmsg_parse(cb->nlh, 0, attrs, XFRMA_MAX, xfrma_policy); if (err < 0) @@ -939,6 +938,7 @@ static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb) proto = nla_get_u8(attrs[XFRMA_PROTO]); xfrm_state_walk_init(walk, proto, filter); + cb->args[0] = 1; } (void) xfrm_state_walk(net, walk, dump_one_state, &info); |