[PATCH net-next v2] selftests/net: initialize char variable to null

[PATCH net-next v2] selftests/net: initialize char variable to null

[Ankit Khushwaha]

char variable in 'so_txtime.c' & 'txtimestamp.c' were left uninitilized
when switch default case taken. which raises following warning.

	txtimestamp.c:240:2: warning: variable 'tsname' is used uninitialized
	whenever switch default is taken [-Wsometimes-uninitialized]

	so_txtime.c:210:3: warning: variable 'reason' is used uninitialized
	whenever switch default is taken [-Wsometimes-uninitialized]

initializing these variables to NULL to fix this.

Signed-off-by: Ankit Khushwaha <ankitkhushwaha.linux@gmail.com>
---
changelog:
v2:
change patch name to net-next.

v1:
https://lore.kernel.org/all/20251124161324.16901-1-ankitkhushwaha.linux@gmail.com/
---
 tools/testing/selftests/net/so_txtime.c   | 2 +-
 tools/testing/selftests/net/txtimestamp.c | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/net/so_txtime.c b/tools/testing/selftests/net/so_txtime.c
index 8457b7ccbc09..b76df1efc2ef 100644
--- a/tools/testing/selftests/net/so_txtime.c
+++ b/tools/testing/selftests/net/so_txtime.c
@@ -174,7 +174,7 @@ static int do_recv_errqueue_timeout(int fdt)
 	msg.msg_controllen = sizeof(control);

 	while (1) {
-		const char *reason;
+		const char *reason = NULL;

 		ret = recvmsg(fdt, &msg, MSG_ERRQUEUE);
 		if (ret == -1 && errno == EAGAIN)
diff --git a/tools/testing/selftests/net/txtimestamp.c b/tools/testing/selftests/net/txtimestamp.c
index dae91eb97d69..bcc14688661d 100644
--- a/tools/testing/selftests/net/txtimestamp.c
+++ b/tools/testing/selftests/net/txtimestamp.c
@@ -217,7 +217,7 @@ static void print_timestamp_usr(void)
 static void print_timestamp(struct scm_timestamping *tss, int tstype,
 			    int tskey, int payload_len)
 {
-	const char *tsname;
+	const char *tsname = NULL;

 	validate_key(tskey, tstype);

--
2.52.0

Re: [PATCH net-next v2] selftests/net: initialize char variable to null

[Willem de Bruijn]

Ankit Khushwaha wrote:
> char variable in 'so_txtime.c' & 'txtimestamp.c' were left uninitilized
> when switch default case taken. which raises following warning.
> 
> 	txtimestamp.c:240:2: warning: variable 'tsname' is used uninitialized
> 	whenever switch default is taken [-Wsometimes-uninitialized]
> 
> 	so_txtime.c:210:3: warning: variable 'reason' is used uninitialized
> 	whenever switch default is taken [-Wsometimes-uninitialized]
> 
> initializing these variables to NULL to fix this.
> 
> Signed-off-by: Ankit Khushwaha <ankitkhushwaha.linux@gmail.com>

Reviewed-by: Willem de Bruijn <willemb@google.com>

minor typo in the first sentence, and there is somewhat interesting
context in the v1. But no need to respin just for that.

> ---
> changelog:
> v2:
> change patch name to net-next.
> 
> v1:
> https://lore.kernel.org/all/20251124161324.16901-1-ankitkhushwaha.linux@gmail.com/
> ---
>  tools/testing/selftests/net/so_txtime.c   | 2 +-
>  tools/testing/selftests/net/txtimestamp.c | 2 +-
>  2 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/tools/testing/selftests/net/so_txtime.c b/tools/testing/selftests/net/so_txtime.c
> index 8457b7ccbc09..b76df1efc2ef 100644
> --- a/tools/testing/selftests/net/so_txtime.c
> +++ b/tools/testing/selftests/net/so_txtime.c
> @@ -174,7 +174,7 @@ static int do_recv_errqueue_timeout(int fdt)
>  	msg.msg_controllen = sizeof(control);
> 
>  	while (1) {
> -		const char *reason;
> +		const char *reason = NULL;
> 
>  		ret = recvmsg(fdt, &msg, MSG_ERRQUEUE);
>  		if (ret == -1 && errno == EAGAIN)
> diff --git a/tools/testing/selftests/net/txtimestamp.c b/tools/testing/selftests/net/txtimestamp.c
> index dae91eb97d69..bcc14688661d 100644
> --- a/tools/testing/selftests/net/txtimestamp.c
> +++ b/tools/testing/selftests/net/txtimestamp.c
> @@ -217,7 +217,7 @@ static void print_timestamp_usr(void)
>  static void print_timestamp(struct scm_timestamping *tss, int tstype,
>  			    int tskey, int payload_len)
>  {
> -	const char *tsname;
> +	const char *tsname = NULL;
> 
>  	validate_key(tskey, tstype);
> 
> --
> 2.52.0
> 

Re: [PATCH net-next v2] selftests/net: initialize char variable to null

[patchwork-bot+netdevbpf]

Hello:

This patch was applied to netdev/net-next.git (main)
by Jakub Kicinski <kuba@kernel.org>:

On Tue, 25 Nov 2025 22:23:02 +0530 you wrote:
> char variable in 'so_txtime.c' & 'txtimestamp.c' were left uninitilized
> when switch default case taken. which raises following warning.
> 
> 	txtimestamp.c:240:2: warning: variable 'tsname' is used uninitialized
> 	whenever switch default is taken [-Wsometimes-uninitialized]
> 
> 	so_txtime.c:210:3: warning: variable 'reason' is used uninitialized
> 	whenever switch default is taken [-Wsometimes-uninitialized]
> 
> [...]

Here is the summary with links:
  - [net-next,v2] selftests/net: initialize char variable to null
    https://git.kernel.org/netdev/net-next/c/af7273cc7ae0

You are awesome, thank you!
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