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SubjectRe: [PATCH] dsa: bcm_sf2_cfp: fix an incorrect NULL check on list iterator
On Sun, Mar 27, 2022 at 01:55:47PM +0800, Xiaomeng Tong wrote:
> The bug is here:
> return rule;
>
> The list iterator value 'rule' will *always* be set and non-NULL
> by list_for_each_entry(), so it is incorrect to assume that the
> iterator value will be NULL if the list is empty or no element
> is found.
>
> To fix the bug, return 'rule' when found, otherwise return NULL.
>
> Cc: stable@vger.kernel.org
> Fixes: ae7a5aff783c7 ("net: dsa: bcm_sf2: Keep copy of inserted rules")
> Signed-off-by: Xiaomeng Tong <xiam0nd.tong@gmail.com>
> ---

The change looks correct, but from a process standpoint for next time
(a) you should have copied Florian, the driver's maintainer (which I did now)
who appears on the top of the list in the output of ./get_maintainer.pl
(b) networking bugfixes that apply to the "net" tree shouldn't need
stable@vger.kernel.org copied, instead just target the patch against
the https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git
tree and mark the subject prefix as "[PATCH net]".

Reviewed-by: Vladimir Oltean <olteanv@gmail.com>

> drivers/net/dsa/bcm_sf2_cfp.c | 6 +++---
> 1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/net/dsa/bcm_sf2_cfp.c b/drivers/net/dsa/bcm_sf2_cfp.c
> index a7e2fcf2df2c..edbe5e7f1cb6 100644
> --- a/drivers/net/dsa/bcm_sf2_cfp.c
> +++ b/drivers/net/dsa/bcm_sf2_cfp.c
> @@ -567,14 +567,14 @@ static void bcm_sf2_cfp_slice_ipv6(struct bcm_sf2_priv *priv,
> static struct cfp_rule *bcm_sf2_cfp_rule_find(struct bcm_sf2_priv *priv,
> int port, u32 location)
> {
> - struct cfp_rule *rule = NULL;
> + struct cfp_rule *rule;
>
> list_for_each_entry(rule, &priv->cfp.rules_list, next) {
> if (rule->port == port && rule->fs.location == location)
> - break;
> + return rule;
> }
>
> - return rule;
> + return NULL;
> }
>
> static int bcm_sf2_cfp_rule_cmp(struct bcm_sf2_priv *priv, int port,
> --
> 2.17.1
>

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