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Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/klassert/ipsec

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Steffen Klassert says:

====================
1) Fix packet receiving of standard IP tunnels when the xfrm_interface
   module is installed. From Xin Long.

2) Fix a race condition between spi allocating and hash list
   resizing. From zhuoliang zhang.
====================

Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Jakub Kicinski
2020-11-04 08:12:52 -08:00
parent fea07a487c a779d91314
commit 2da4c187ae
4 changed files with 13 additions and 11 deletions
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8
net/xfrm/xfrm_state.c
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@@ -2004,6 +2004,7 @@ int xfrm_alloc_spi(struct xfrm_state *x, u32 low, u32 high)
int err = -ENOENT;
__be32 minspi = htonl(low);
__be32 maxspi = htonl(high);
__be32 newspi = 0;
u32 mark = x->mark.v & x->mark.m;
spin_lock_bh(&x->lock);
@@ -2022,21 +2023,22 @@ int xfrm_alloc_spi(struct xfrm_state *x, u32 low, u32 high)
xfrm_state_put(x0);
goto unlock;
}
x->id.spi = minspi;
newspi = minspi;
} else {
u32 spi = 0;
for (h = 0; h < high-low+1; h++) {
spi = low + prandom_u32()%(high-low+1);
x0 = xfrm_state_lookup(net, mark, &x->id.daddr, htonl(spi), x->id.proto, x->props.family);
if (x0 == NULL) {
x->id.spi = htonl(spi);
newspi = htonl(spi);
break;
}
xfrm_state_put(x0);
}
}
if (x->id.spi) {
if (newspi) {
spin_lock_bh(&net->xfrm.xfrm_state_lock);
x->id.spi = newspi;
h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, x->props.family);
hlist_add_head_rcu(&x->byspi, net->xfrm.state_byspi + h);
spin_unlock_bh(&net->xfrm.xfrm_state_lock);