[PATCH v3] net: amd: Fix link leak when verifying config failed

[PATCH v3] net: amd: Fix link leak when verifying config failed

[Gencen Gan]

After failing to verify configuration, it returns directly without
releasing link, which may cause memory leak.

Paolo Abeni thinks that the whole code of this driver is quite 
"suboptimal" and looks unmainatained since at least ~15y, so he 
suggests that we could simply remove the whole driver, please 
take it into consideration.

Fixes: 2b3af54dc373 ("net: amd: Fix link leak when verifying config failed")
Signed-off-by: Gan Gecen <gangecen@hust.edu.cn>
Reviewed-by: Paolo Abeni <pabeni@redhat.com>
---
v2->v3: Add Fixes tag and add a suggestion about this driver.
 drivers/net/ethernet/amd/nmclan_cs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/amd/nmclan_cs.c b/drivers/net/ethernet/amd/nmclan_cs.c
index 823a329a921f..0dd391c84c13 100644
--- a/drivers/net/ethernet/amd/nmclan_cs.c
+++ b/drivers/net/ethernet/amd/nmclan_cs.c
@@ -651,7 +651,7 @@ static int nmclan_config(struct pcmcia_device *link)
     } else {
       pr_notice("mace id not found: %x %x should be 0x40 0x?9\n",
 		sig[0], sig[1]);
-      return -ENODEV;
+      goto failed;
     }
   }
 
-- 
2.34.1

Re: [PATCH v3] net: amd: Fix link leak when verifying config failed

[Simon Horman]

On Sat, Apr 22, 2023 at 02:33:03AM +0800, Gencen Gan wrote:
> After failing to verify configuration, it returns directly without
> releasing link, which may cause memory leak.
> 
> Paolo Abeni thinks that the whole code of this driver is quite 
> "suboptimal" and looks unmainatained since at least ~15y, so he 
> suggests that we could simply remove the whole driver, please 
> take it into consideration.
> 
> Fixes: 2b3af54dc373 ("net: amd: Fix link leak when verifying config failed")

Perhaps it would be better to remove the driver.
Perhaps we can take this fix then consider removing it.
But if we do move forwards with this patch then
I suggest the fixes tag should that below, as:

  a) The problem seems to have been present since the beginning of git
     history; and
  b) The commit above doesn't seem to exist in net or net-next
     (I assume it's a local commit id of this patch)

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")

> Signed-off-by: Gan Gecen <gangecen@hust.edu.cn>
> Reviewed-by: Paolo Abeni <pabeni@redhat.com>
> ---
> v2->v3: Add Fixes tag and add a suggestion about this driver.
>  drivers/net/ethernet/amd/nmclan_cs.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/amd/nmclan_cs.c b/drivers/net/ethernet/amd/nmclan_cs.c
> index 823a329a921f..0dd391c84c13 100644
> --- a/drivers/net/ethernet/amd/nmclan_cs.c
> +++ b/drivers/net/ethernet/amd/nmclan_cs.c
> @@ -651,7 +651,7 @@ static int nmclan_config(struct pcmcia_device *link)
>      } else {
>        pr_notice("mace id not found: %x %x should be 0x40 0x?9\n",
>  		sig[0], sig[1]);
> -      return -ENODEV;
> +      goto failed;
>      }
>    }
>  
> -- 
> 2.34.1
>