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net: sched: cls_u32: Undo refcount decrement in case update failed 

In the case of an update, when TCA_U32_LINK is set, u32_set_parms will
decrement the refcount of the ht_down (struct tc_u_hnode) pointer
present in the older u32 filter which we are replacing. However, if
u32_replace_hw_knode errors out, the update command fails and that
ht_down pointer continues decremented. To fix that, when
u32_replace_hw_knode fails, check if ht_down's refcount was decremented
and undo the decrement.

Fixes: d34e3e1813 ("net: cls_u32: Add support for skip-sw flag to tc u32 classifier.")
Signed-off-by: Victor Nogueira <victor@mojatatu.com>
Acked-by: Jamal Hadi Salim <jhs@mojatatu.com>
Reviewed-by: Pedro Tammela <pctammela@mojatatu.com>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Victor Nogueira 2023-07-13 15:05:12 -03:00 committed by David S. Miller
parent 9cb36faede
commit e8d3d78c19
1 changed files with 7 additions and 0 deletions
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7
net/sched/cls_u32.c
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@ -928,6 +928,13 @@ static int u32_change(struct net *net, struct sk_buff *in_skb,
if (err) {
u32_unbind_filter(tp, new, tb);
if (tb[TCA_U32_LINK]) {
struct tc_u_hnode *ht_old;
ht_old = rtnl_dereference(n->ht_down);
if (ht_old)
ht_old->refcnt++;
}
__u32_destroy_key(new);
return err;
}