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authorDavid S. Miller <davem@davemloft.net>2008-09-02 20:14:15 -0700
committerDavid S. Miller <davem@davemloft.net>2008-09-02 20:14:15 -0700
commit37b08e34a98c664bea86e3fae718ac45a46b7276 (patch)
tree8d0cc32bdbfda4d992177aeda56700bea0f918dd /net/xfrm
parent06770843c2f0f929a6e0c758dc433902a01aabfb (diff)
downloadlinux-37b08e34a98c664bea86e3fae718ac45a46b7276.tar.bz2
ipsec: Fix deadlock in xfrm_state management.
Ever since commit 4c563f7669c10a12354b72b518c2287ffc6ebfb3 ("[XFRM]: Speed up xfrm_policy and xfrm_state walking") it is illegal to call __xfrm_state_destroy (and thus xfrm_state_put()) with xfrm_state_lock held. If we do, we'll deadlock since we have the lock already and __xfrm_state_destroy() tries to take it again. Fix this by pushing the xfrm_state_put() calls after the lock is dropped. Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/xfrm')
-rw-r--r--net/xfrm/xfrm_state.c32
1 files changed, 23 insertions, 9 deletions
diff --git a/net/xfrm/xfrm_state.c b/net/xfrm/xfrm_state.c
index 4c6914ef7d92..7bd62f61593f 100644
--- a/net/xfrm/xfrm_state.c
+++ b/net/xfrm/xfrm_state.c
@@ -780,11 +780,13 @@ xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
{
unsigned int h;
struct hlist_node *entry;
- struct xfrm_state *x, *x0;
+ struct xfrm_state *x, *x0, *to_put;
int acquire_in_progress = 0;
int error = 0;
struct xfrm_state *best = NULL;
+ to_put = NULL;
+
spin_lock_bh(&xfrm_state_lock);
h = xfrm_dst_hash(daddr, saddr, tmpl->reqid, family);
hlist_for_each_entry(x, entry, xfrm_state_bydst+h, bydst) {
@@ -833,7 +835,7 @@ xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
if (tmpl->id.spi &&
(x0 = __xfrm_state_lookup(daddr, tmpl->id.spi,
tmpl->id.proto, family)) != NULL) {
- xfrm_state_put(x0);
+ to_put = x0;
error = -EEXIST;
goto out;
}
@@ -849,7 +851,7 @@ xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
error = security_xfrm_state_alloc_acquire(x, pol->security, fl->secid);
if (error) {
x->km.state = XFRM_STATE_DEAD;
- xfrm_state_put(x);
+ to_put = x;
x = NULL;
goto out;
}
@@ -870,7 +872,7 @@ xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
xfrm_hash_grow_check(x->bydst.next != NULL);
} else {
x->km.state = XFRM_STATE_DEAD;
- xfrm_state_put(x);
+ to_put = x;
x = NULL;
error = -ESRCH;
}
@@ -881,6 +883,8 @@ out:
else
*err = acquire_in_progress ? -EAGAIN : error;
spin_unlock_bh(&xfrm_state_lock);
+ if (to_put)
+ xfrm_state_put(to_put);
return x;
}
@@ -1067,18 +1071,20 @@ static struct xfrm_state *__xfrm_find_acq_byseq(u32 seq);
int xfrm_state_add(struct xfrm_state *x)
{
- struct xfrm_state *x1;
+ struct xfrm_state *x1, *to_put;
int family;
int err;
int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
family = x->props.family;
+ to_put = NULL;
+
spin_lock_bh(&xfrm_state_lock);
x1 = __xfrm_state_locate(x, use_spi, family);
if (x1) {
- xfrm_state_put(x1);
+ to_put = x1;
x1 = NULL;
err = -EEXIST;
goto out;
@@ -1088,7 +1094,7 @@ int xfrm_state_add(struct xfrm_state *x)
x1 = __xfrm_find_acq_byseq(x->km.seq);
if (x1 && ((x1->id.proto != x->id.proto) ||
xfrm_addr_cmp(&x1->id.daddr, &x->id.daddr, family))) {
- xfrm_state_put(x1);
+ to_put = x1;
x1 = NULL;
}
}
@@ -1110,6 +1116,9 @@ out:
xfrm_state_put(x1);
}
+ if (to_put)
+ xfrm_state_put(to_put);
+
return err;
}
EXPORT_SYMBOL(xfrm_state_add);
@@ -1269,10 +1278,12 @@ EXPORT_SYMBOL(xfrm_state_migrate);
int xfrm_state_update(struct xfrm_state *x)
{
- struct xfrm_state *x1;
+ struct xfrm_state *x1, *to_put;
int err;
int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
+ to_put = NULL;
+
spin_lock_bh(&xfrm_state_lock);
x1 = __xfrm_state_locate(x, use_spi, x->props.family);
@@ -1281,7 +1292,7 @@ int xfrm_state_update(struct xfrm_state *x)
goto out;
if (xfrm_state_kern(x1)) {
- xfrm_state_put(x1);
+ to_put = x1;
err = -EEXIST;
goto out;
}
@@ -1295,6 +1306,9 @@ int xfrm_state_update(struct xfrm_state *x)
out:
spin_unlock_bh(&xfrm_state_lock);
+ if (to_put)
+ xfrm_state_put(to_put);
+
if (err)
return err;