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authorVictor Nogueira <victor@mojatatu.com>2023-07-13 15:05:12 -0300
committerDavid S. Miller <davem@davemloft.net>2023-07-17 07:33:38 +0100
commite8d3d78c19be0264a5692bed477c303523aead31 (patch)
tree45f2c467ccc58414bee4fccf43708cd670fd7793 /net
parent9cb36faedeafb9720ac236aeae2ea57091d90a09 (diff)
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: d34e3e181395 ("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>
Diffstat (limited to 'net')
-rw-r--r--net/sched/cls_u32.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/net/sched/cls_u32.c b/net/sched/cls_u32.c
index ed358466d042..5abf31e432ca 100644
--- a/net/sched/cls_u32.c
+++ b/net/sched/cls_u32.c
@@ -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;
}