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net: wwan: t7xx: Prefer struct_size over open coded arithmetic

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This is an effort to get rid of all multiplications from allocation
functions in order to prevent integer overflows [1][2].

As the "port_prox" variable is a pointer to "struct port_proxy" and
this structure ends in a flexible array:

struct port_proxy {
	[...]
	struct t7xx_port ports[];
};

the preferred way in the kernel is to use the struct_size() helper to
do the arithmetic instead of the argument "size + size * count" in the
devm_kzalloc() function.

This way, the code is more readable and safer.

Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#open-coded-arithmetic-in-allocator-arguments [1]
Link: https://github.com/KSPP/linux/issues/160 [2]

Signed-off-by: Erick Archer <erick.archer@gmx.com>
Reviewed-by: Sergey Ryazanov <ryazanov.s.a@gmail.com>
Link: https://lore.kernel.org/r/20240224181932.2720-1-erick.archer@gmx.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Erick Archer 2024-02-24 19:19:32 +01:00 committed by Jakub Kicinski
parent d75fe63a07
commit 848e34ca20
1 changed files with 4 additions and 2 deletions
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6
drivers/net/wwan/t7xx/t7xx_port_proxy.c
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@ -543,8 +543,10 @@ static int t7xx_proxy_alloc(struct t7xx_modem *md)
struct device *dev = &md->t7xx_dev->pdev->dev;
struct port_proxy *port_prox;
port_prox = devm_kzalloc(dev, sizeof(*port_prox) +
sizeof(struct t7xx_port) * T7XX_MAX_POSSIBLE_PORTS_NUM,
port_prox = devm_kzalloc(dev,
struct_size(port_prox,
ports,
T7XX_MAX_POSSIBLE_PORTS_NUM),
GFP_KERNEL);
if (!port_prox)
return -ENOMEM;