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octeontx2-pf: Fix potential use after free in otx2_tc_add_flow()

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[ Upstream commit d9c70e93ec5988ab07ad2a92d9f9d12867f02c56 ]

This code calls kfree_rcu(new_node, rcu) and then dereferences "new_node"
and then dereferences it on the next line.  Two lines later, we take
a mutex so I don't think this is an RCU safe region.  Re-order it to do
the dereferences before queuing up the free.

Fixes: 68fbff68db ("octeontx2-pf: Add police action for TC flower")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Reviewed-by: Vadim Fedorenko <vadim.fedorenko@linux.dev>
Link: https://patch.msgid.link/aNKCL1jKwK8GRJHh@stanley.mountain
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Dan Carpenter 2025-09-23 14:19:11 +03:00 committed by Greg Kroah-Hartman
parent ca74b67b47
commit c41b2941a0
1 changed files with 1 additions and 1 deletions
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2
drivers/net/ethernet/marvell/octeontx2/nic/otx2_tc.c
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@ -1319,7 +1319,6 @@ static int otx2_tc_add_flow(struct otx2_nic *nic,
free_leaf:
otx2_tc_del_from_flow_list(flow_cfg, new_node);
kfree_rcu(new_node, rcu);
if (new_node->is_act_police) {
mutex_lock(&nic->mbox.lock);
@ -1339,6 +1338,7 @@ free_leaf:
mutex_unlock(&nic->mbox.lock);
}
kfree_rcu(new_node, rcu);
return rc;
}