linux-kernel - Re: [PATCH net-next v7 1/8] net: pktgen: fix mix of int/long

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Message-ID: <20250224103856.31dc0260@gmx.net>
Date: Mon, 24 Feb 2025 10:38:56 +0100
From: Peter Seiderer <ps.report@....net>
To: netdev@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org, "David S
 . Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Jakub
 Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, Simon Horman
 <horms@...nel.org>, Shuah Khan <shuah@...nel.org>, Thomas Gleixner
 <tglx@...utronix.de>, Artem Chernyshev <artem.chernyshev@...-soft.ru>,
 Frederic Weisbecker <frederic@...nel.org>, Nam Cao <namcao@...utronix.de>
Subject: Re: [PATCH net-next v7 1/8] net: pktgen: fix mix of int/long

Hello *,

On Mon, 24 Feb 2025 10:22:35 +0100, Peter Seiderer <ps.report@....net> wrote:

> Fix mix of int/long (and multiple conversion from/to) by using consequently
> size_t for i and max and ssize_t for len and adjust function signatures
> of hex32_arg(), count_trail_chars(), num_arg() and strn_len() accordingly.
>
> Signed-off-by: Peter Seiderer <ps.report@....net>

Actual missing the rev-by Simon Horman given for the v5 version of the
patch set (see [1]) and indicated in the change description v5->v6...

Regards,
Peter

[1] https://lore.kernel.org/netdev/20250216135748.GD1615191@kernel.org/

> ---
> Changes v6 -> v7
>   - rebased on actual net-next/main
>   - no changes
>
> Changes v5 -> v6
>   - adjust to dropped patch ''net: pktgen: use defines for the various
>     dec/hex number parsing digits lengths'
>   - add rev-by Simon Horman
>   - fix line break (suggested by Simon Horman)
>
> Changes v4 -> v5
>   - split up patchset into part i/ii (suggested by Simon Horman)
>   - instead of align to most common pattern (int) adjust all usages to
>     size_t for i and max and ssize_t for len and adjust function signatures
>     of hex32_arg(), count_trail_chars(), num_arg() and strn_len() accordingly
>   - respect reverse xmas tree order for local variable declarations (where
>     possible without too much code churn)
>   - update subject line and patch description
>   - fix checkpatch warning '"foo * bar" should be "foo *bar"' for
>     count_trail_chars() and strn_len()
>
> Changes v3 -> v4
>   - new patch (factored out of patch 'net: pktgen: fix access outside of user
>     given buffer in pktgen_if_write()')
> ---
>  net/core/pktgen.c | 38 ++++++++++++++++++++------------------
>  1 file changed, 20 insertions(+), 18 deletions(-)
>
> diff --git a/net/core/pktgen.c b/net/core/pktgen.c
> index 55064713223e..cd6b6c0dc0dc 100644
> --- a/net/core/pktgen.c
> +++ b/net/core/pktgen.c
> @@ -746,10 +746,11 @@ static int pktgen_if_show(struct seq_file *seq, void *v)
>  }
>
>
> -static int hex32_arg(const char __user *user_buffer, unsigned long maxlen,
> -		     __u32 *num)
> +static ssize_t hex32_arg(const char __user *user_buffer, size_t maxlen,
> +			 __u32 *num)
>  {
> -	int i = 0;
> +	size_t i = 0;
> +
>  	*num = 0;
>
>  	for (; i < maxlen; i++) {
> @@ -768,10 +769,9 @@ static int hex32_arg(const char __user *user_buffer, unsigned long maxlen,
>  	return i;
>  }
>
> -static int count_trail_chars(const char __user * user_buffer,
> -			     unsigned int maxlen)
> +static ssize_t count_trail_chars(const char __user *user_buffer, size_t maxlen)
>  {
> -	int i;
> +	size_t i;
>
>  	for (i = 0; i < maxlen; i++) {
>  		char c;
> @@ -793,10 +793,10 @@ static int count_trail_chars(const char __user * user_buffer,
>  	return i;
>  }
>
> -static long num_arg(const char __user *user_buffer, unsigned long maxlen,
> -				unsigned long *num)
> +static ssize_t num_arg(const char __user *user_buffer, size_t maxlen,
> +		       unsigned long *num)
>  {
> -	int i;
> +	size_t i;
>  	*num = 0;
>
>  	for (i = 0; i < maxlen; i++) {
> @@ -812,9 +812,9 @@ static long num_arg(const char __user *user_buffer, unsigned long maxlen,
>  	return i;
>  }
>
> -static int strn_len(const char __user * user_buffer, unsigned int maxlen)
> +static ssize_t strn_len(const char __user *user_buffer, size_t maxlen)
>  {
> -	int i;
> +	size_t i;
>
>  	for (i = 0; i < maxlen; i++) {
>  		char c;
> @@ -844,9 +844,9 @@ static int strn_len(const char __user * user_buffer, unsigned int maxlen)
>  static ssize_t get_imix_entries(const char __user *buffer,
>  				struct pktgen_dev *pkt_dev)
>  {
> -	const int max_digits = 10;
> -	int i = 0;
> -	long len;
> +	const size_t max_digits = 10;
> +	size_t i = 0;
> +	ssize_t len;
>  	char c;
>
>  	pkt_dev->n_imix_entries = 0;
> @@ -895,9 +895,9 @@ static ssize_t get_imix_entries(const char __user *buffer,
>  static ssize_t get_labels(const char __user *buffer, struct pktgen_dev *pkt_dev)
>  {
>  	unsigned int n = 0;
> +	size_t i = 0;
> +	ssize_t len;
>  	char c;
> -	ssize_t i = 0;
> -	int len;
>
>  	pkt_dev->nr_labels = 0;
>  	do {
> @@ -956,7 +956,8 @@ static ssize_t pktgen_if_write(struct file *file,
>  {
>  	struct seq_file *seq = file->private_data;
>  	struct pktgen_dev *pkt_dev = seq->private;
> -	int i, max, len;
> +	size_t i, max;
> +	ssize_t len;
>  	char name[16], valstr[32];
>  	unsigned long value = 0;
>  	char *pg_result = NULL;
> @@ -1883,7 +1884,8 @@ static ssize_t pktgen_thread_write(struct file *file,
>  {
>  	struct seq_file *seq = file->private_data;
>  	struct pktgen_thread *t = seq->private;
> -	int i, max, len, ret;
> +	size_t i, max;
> +	ssize_t len, ret;
>  	char name[40];
>  	char *pg_result;
>