netdev - Re: [PATCH net-next] net/mlx5: HWS, Add an error check in hws_bwc_rule_complex_hash_node

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Message-ID: <aD0-snUAsqT2_3NH@stanley.mountain>
Date: Mon, 2 Jun 2025 09:03:30 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: Yevgeny Kliteynik <kliteyn@...dia.com>
Cc: Saeed Mahameed <saeedm@...dia.com>, Leon Romanovsky <leon@...nel.org>,
	Tariq Toukan <tariqt@...dia.com>,
	Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Mark Bloch <mbloch@...dia.com>, Cosmin Ratiu <cratiu@...dia.com>,
	Vlad Dogaru <vdogaru@...dia.com>, netdev@...r.kernel.org,
	linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: Re: [PATCH net-next] net/mlx5: HWS, Add an error check in
 hws_bwc_rule_complex_hash_node_get()

On Thu, May 29, 2025 at 01:26:17AM +0300, Yevgeny Kliteynik wrote:
> On 28-May-25 11:12, Dan Carpenter wrote:
> > The rhashtable_lookup_get_insert_fast() function inserts an object into
> > the hashtable.  If the object was already present in the table it
> > returns a pointer to the original object.  If the object wasn't there
> > it returns NULL.  If there was an allocation error or some other kind
> > of failure, it returns an error pointer.
> > 
> > This caller needs to check for error pointers to avoid an error pointer
> > dereference.  Add the check.
> > 
> > Fixes: 17e0accac577 ("net/mlx5: HWS, support complex matchers")
> > Signed-off-by: Dan Carpenter <dan.carpenter@...aro.org>
> > ---
> >   .../net/ethernet/mellanox/mlx5/core/steering/hws/bwc_complex.c | 3 +++
> >   1 file changed, 3 insertions(+)
> > 
> > diff --git a/drivers/net/ethernet/mellanox/mlx5/core/steering/hws/bwc_complex.c b/drivers/net/ethernet/mellanox/mlx5/core/steering/hws/bwc_complex.c
> > index 5d30c5b094fc..6ae362fe2f36 100644
> > --- a/drivers/net/ethernet/mellanox/mlx5/core/steering/hws/bwc_complex.c
> > +++ b/drivers/net/ethernet/mellanox/mlx5/core/steering/hws/bwc_complex.c
> > @@ -1094,6 +1094,9 @@ hws_bwc_rule_complex_hash_node_get(struct mlx5hws_bwc_rule *bwc_rule,
> >   	old_node = rhashtable_lookup_get_insert_fast(refcount_hash,
> >   						     &node->hash_node,
> >   						     hws_refcount_hash);
> > +	if (IS_ERR(old_node))
> > +		return PTR_ERR(old_node);
> > +
> 
> Agree with the need to check IS_ERR, but error flow is missing here.
> Need to free the previously allocated IDA and node.
> 

:/  Yeah.  Sorry...  I'll resend.

regards,
dan carpenter