netdev - Re: [PATCH net v5] selftest:net: Fix uninit return values

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Message-ID: <willemdebruijn.kernel.30a447f86eaaa@gmail.com>
Date: Tue, 30 Sep 2025 08:50:00 -0400
From: Willem de Bruijn <willemdebruijn.kernel@...il.com>
To: Sidharth Seela <sidharthseela@...il.com>, 
 antonio@...nvpn.net, 
 sd@...asysnail.net, 
 edumazet@...gle.com, 
 kuba@...nel.org, 
 pabeni@...hat.com, 
 horms@...nel.org, 
 shuah@...nel.org, 
 willemdebruijn.kernel@...il.com, 
 kernelxing@...cent.com, 
 nathan@...nel.org, 
 nick.desaulniers+lkml@...il.com, 
 morbo@...gle.com, 
 justinstitt@...gle.com
Cc: netdev@...r.kernel.org, 
 linux-kselftest@...r.kernel.org, 
 linux-kernel@...r.kernel.org, 
 llvm@...ts.linux.dev, 
 david.hunter.linux@...il.com, 
 Sidharth Seela <sidharthseela@...il.com>
Subject: Re: [PATCH net v5] selftest:net: Fix uninit return values

Since it's now only to ovpn, better prefix, which matches other
patches in that directory, is "selftest/net/ovpn:"

Btw, review the posting rules. Leave 24 hours between reposts:

https://www.kernel.org/doc/html/latest/process/maintainer-netdev.html


Sidharth Seela wrote:
> Fix functions that return undefined values. These issues were caught by
> running clang using LLVM=1 option.
> 
> Clang warnings are as follows:
> ovpn-cli.c:1587:6: warning: variable 'ret' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized]
>  1587 |         if (!sock) {
>       |             ^~~~~
> ovpn-cli.c:1635:9: note: uninitialized use occurs here
>  1635 |         return ret;
>       |                ^~~
> ovpn-cli.c:1587:2: note: remove the 'if' if its condition is always false
>  1587 |         if (!sock) {
>       |         ^~~~~~~~~~~~
>  1588 |                 fprintf(stderr, "cannot allocate netlink socket\n");
>       |                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>  1589 |                 goto err_free;
>       |                 ~~~~~~~~~~~~~~
>  1590 |         }
>       |         ~
> ovpn-cli.c:1584:15: note: initialize the variable 'ret' to silence this warning
>  1584 |         int mcid, ret;
>       |                      ^
>       |                       = 0
> ovpn-cli.c:2107:7: warning: variable 'ret' is used uninitialized whenever switch case is taken [-Wsometimes-uninitialized]
>  2107 |         case CMD_INVALID:
>       |              ^~~~~~~~~~~
> ovpn-cli.c:2111:9: note: uninitialized use occurs here
>  2111 |         return ret;
>       |                ^~~
> ovpn-cli.c:1939:12: note: initialize the variable 'ret' to silence this warning
>  1939 |         int n, ret;
>       |                   ^
>       |
> 
> Fixes: 959bc330a439 ("testing/selftests: add test tool and scripts for ovpn module")
> ovpn module")

stray line

> Signed-off-by: Sidharth Seela <sidharthseela@...il.com>
> ---
> 
> v5:
> 	- Assign -ENOMEM to ret inside if block.
> 	- Assign -EINVAL to ret inside case block.
> v4:
> 	- Move changelog below sign-off.
> 	- Remove double-hyphens in commit description.
> v3:
> 	- Use prefix net.
> 	- Remove so_txtime fix as default case calls error().
> 	- Changelog before sign-off.
> 	- Three dashes after sign-off
> v2:
> 	- Use subsystem name "net".
> 	- Add fixes tags.
> 	- Remove txtimestamp fix as default case calls error.
> 	- Assign constant error string instead of NULL.
> 
> diff --git a/tools/testing/selftests/net/ovpn/ovpn-cli.c b/tools/testing/selftests/net/ovpn/ovpn-cli.c
> index 9201f2905f2c..8d0f2f61923c 100644
> --- a/tools/testing/selftests/net/ovpn/ovpn-cli.c
> +++ b/tools/testing/selftests/net/ovpn/ovpn-cli.c
> @@ -1586,6 +1586,7 @@ static int ovpn_listen_mcast(void)
>  	sock = nl_socket_alloc();
>  	if (!sock) {
>  		fprintf(stderr, "cannot allocate netlink socket\n");
> +		ret = -ENOMEM;
>  		goto err_free;
>  	}
>  
> @@ -2105,6 +2106,7 @@ static int ovpn_run_cmd(struct ovpn_ctx *ovpn)
>  		ret = ovpn_listen_mcast();
>  		break;
>  	case CMD_INVALID:
> +		ret = -EINVAL;
>  		break;
>  	}
>  
> -- 
> 2.47.3
>