[maint] batman-adv: avoid NULL dereferences and fix if check
Commit Message
Gateway having bandwidth_down equal to zero are not accepted
at all and so never added to the Gateway list.
For this reason checking the bandwidth_down member in
batadv_gw_out_of_range() is useless.
This is probably a copy/paste error and this check was supposed
to be "!gw_node" only. Moreover, the way the check is written
now may also lead to a NULL dereference.
Fix this by rewriting the if-condition properly.
Introduced by 0853ec7fafe0a195754454832993c6b35e22b842
("batman-adv: tvlv - gateway download/upload bandwidth container")
Signed-off-by: Antonio Quartulli <antonio@meshcoding.com>
Reported-by: David Binderman <dcb314@hotmail.com>
---
This patch makes "batman-adv: avoid NULL dereferences and clarify if check"
obsolete.
gateway_client.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
Comments
On Saturday 20 September 2014 18:22:05 Antonio Quartulli wrote:
> Gateway having bandwidth_down equal to zero are not accepted
> at all and so never added to the Gateway list.
> For this reason checking the bandwidth_down member in
> batadv_gw_out_of_range() is useless.
>
> This is probably a copy/paste error and this check was supposed
> to be "!gw_node" only. Moreover, the way the check is written
> now may also lead to a NULL dereference.
>
> Fix this by rewriting the if-condition properly.
>
> Introduced by 0853ec7fafe0a195754454832993c6b35e22b842
> ("batman-adv: tvlv - gateway download/upload bandwidth container")
>
> Signed-off-by: Antonio Quartulli <antonio@meshcoding.com>
> Reported-by: David Binderman <dcb314@hotmail.com>
> ---
>
> This patch makes "batman-adv: avoid NULL dereferences and clarify if check"
> obsolete.
>
>
> gateway_client.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
Applied in revision cb2b79e.
Thanks,
Marek
@@ -811,7 +811,7 @@ bool batadv_gw_out_of_range(struct batadv_priv *bat_priv,
goto out;
gw_node = batadv_gw_node_get(bat_priv, orig_dst_node);
- if (!gw_node->bandwidth_down == 0)
+ if (!gw_node)
goto out;
switch (atomic_read(&bat_priv->gw_mode)) {