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| author |   Florian Westphal <fw@strlen.de> | 2018-11-27 13:28:54 +0100 |
|---|---|---|
| committer |   Steffen Klassert <steffen.klassert@secunet.com> | 2018-11-28 07:05:48 +0100 |
| commit | 88584c30e31967db2ad03c7015a9aea3460deb2c (patch) | |
| tree | 6406da2c4e7866f0ce659a891a4f2f1ffe652d7d /net/xfrm/xfrm_policy.c | |
| parent | xfrm6: remove BUG_ON from xfrm6_dst_ifdown (diff) | |
| download | linux-dev-88584c30e31967db2ad03c7015a9aea3460deb2c.tar.xz linux-dev-88584c30e31967db2ad03c7015a9aea3460deb2c.zip | |
xfrm: policy: fix policy hash rebuild
Dan Carpenter reports following static checker warning:
net/xfrm/xfrm_policy.c:1316 xfrm_hash_rebuild()
warn: 'dir' is out of bounds '3' vs '2'
| 1280 /* reset the bydst and inexact table in all directions */
| 1281 xfrm_hash_reset_inexact_table(net);
| 1282
| 1283 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
| ^^^^^^^^^^^^^^^^^^^^^
|dir == XFRM_POLICY_MAX at the end of this loop.
| 1304 /* re-insert all policies by order of creation */
| 1305 list_for_each_entry_reverse(policy, &net->xfrm.policy_all, walk.all) {
[..]
| 1314 xfrm_policy_id2dir(policy->index));
| 1315 if (!chain) {
| 1316 void *p = xfrm_policy_inexact_insert(policy, dir, 0);
Fix this by updating 'dir' based on current policy. Otherwise, the
inexact policies won't be found anymore during lookup, as they get
hashed to a bogus bin.
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Fixes: cc1bb845adc9 ("xfrm: policy: return NULL when inexact search needed")
Signed-off-by: Florian Westphal <fw@strlen.de>
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 | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c index ddc3335dd552..be04091eb7db 100644 --- a/net/xfrm/xfrm_policy.c +++ b/net/xfrm/xfrm_policy.c @@ -1303,15 +1303,16 @@ static void xfrm_hash_rebuild(struct work_struct *work) /* re-insert all policies by order of creation */ list_for_each_entry_reverse(policy, &net->xfrm.policy_all, walk.all) { - if (policy->walk.dead || - xfrm_policy_id2dir(policy->index) >= XFRM_POLICY_MAX) { + if (policy->walk.dead) + continue; + dir = xfrm_policy_id2dir(policy->index); + if (dir >= XFRM_POLICY_MAX) { /* skip socket policies */ continue; } newpos = NULL; chain = policy_hash_bysel(net, &policy->selector, - policy->family, - xfrm_policy_id2dir(policy->index)); + policy->family, dir); if (!chain) { void *p = xfrm_policy_inexact_insert(policy, dir, 0); |