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| author | Steffen Klassert <steffen.klassert@secunet.com> | 2018-01-10 12:14:28 +0100 |
|---|---|---|
| committer | Steffen Klassert <steffen.klassert@secunet.com> | 2018-01-10 12:14:28 +0100 |
| commit | 76a4201191814a0061cb5c861fafb9ecaa764846 (patch) | |
| tree | 4b0ebc8c3049929f91b2a37d0d0fbfccbbefd407 /net/xfrm/xfrm_policy.c | |
| parent | 1e532d2b49645e7cb76d5af6cb5bc4ec93d861ae (diff) | |
| download | op-kernel-dev-76a4201191814a0061cb5c861fafb9ecaa764846.zip op-kernel-dev-76a4201191814a0061cb5c861fafb9ecaa764846.tar.gz | |
xfrm: Fix a race in the xdst pcpu cache.
We need to run xfrm_resolve_and_create_bundle() with
bottom halves off. Otherwise we may reuse an already
released dst_enty when the xfrm lookup functions are
called from process context.
Fixes: c30d78c14a813db39a647b6a348b428 ("xfrm: add xdst pcpu cache")
Reported-by: Darius Ski <darius.ski@gmail.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Diffstat (limited to 'net/xfrm/xfrm_policy.c')
| -rw-r--r-- | net/xfrm/xfrm_policy.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c index bc5eae1..bd6b0e7 100644 --- a/net/xfrm/xfrm_policy.c +++ b/net/xfrm/xfrm_policy.c @@ -2063,8 +2063,11 @@ xfrm_bundle_lookup(struct net *net, const struct flowi *fl, u16 family, u8 dir, if (num_xfrms <= 0) goto make_dummy_bundle; + local_bh_disable(); xdst = xfrm_resolve_and_create_bundle(pols, num_pols, fl, family, - xflo->dst_orig); + xflo->dst_orig); + local_bh_enable(); + if (IS_ERR(xdst)) { err = PTR_ERR(xdst); if (err != -EAGAIN) @@ -2151,9 +2154,12 @@ struct dst_entry *xfrm_lookup(struct net *net, struct dst_entry *dst_orig, goto no_transform; } + local_bh_disable(); xdst = xfrm_resolve_and_create_bundle( pols, num_pols, fl, family, dst_orig); + local_bh_enable(); + if (IS_ERR(xdst)) { xfrm_pols_put(pols, num_pols); err = PTR_ERR(xdst); |
