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| author | Victor Nogueira <victor@mojatatu.com> | 2023-07-13 21:05:12 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-07-27 09:50:41 +0300 |
| commit | 2256b27f542bd245b1692fc026ebefe061cc6335 (patch) | |
| tree | 466b7d9f252c2373236cd0dd928ec6352121e200 /net/sched | |
| parent | a9345793469b65ee5ba7b033239916c2a67d3dd4 (diff) | |
| download | linux-2256b27f542bd245b1692fc026ebefe061cc6335.tar.xz | |
net: sched: cls_u32: Undo refcount decrement in case update failed
[ Upstream commit e8d3d78c19be0264a5692bed477c303523aead31 ]
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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'net/sched')
| -rw-r--r-- | net/sched/cls_u32.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/net/sched/cls_u32.c b/net/sched/cls_u32.c index 7cfbcd518084..1280736a7b92 100644 --- a/net/sched/cls_u32.c +++ b/net/sched/cls_u32.c @@ -926,6 +926,13 @@ 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; } |