linux-hardening - [PATCH] wifi: iwlegacy: Use kcalloc() instead of kzalloc()

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Message-Id: <20240119171655.7740-1-erick.archer@gmx.com>
Date: Fri, 19 Jan 2024 18:16:55 +0100
From: Erick Archer <erick.archer@....com>
To: Stanislaw Gruszka <stf_xl@...pl>,
	Kalle Valo <kvalo@...nel.org>,
	"Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc: Erick Archer <erick.archer@....com>,
	linux-wireless@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-hardening@...r.kernel.org
Subject: [PATCH] wifi: iwlegacy: Use kcalloc() instead of kzalloc()

As noted in the "Deprecated Interfaces, Language Features, Attributes,
and Conventions" documentation [1], size calculations (especially
multiplication) should not be performed in memory allocator (or similar)
function arguments due to the risk of them overflowing. This could lead
to values wrapping around and a smaller allocation being made than the
caller was expecting. Using those allocations could lead to linear
overflows of heap memory and other misbehaviors.

So, use the purpose specific kcalloc() function instead of the argument
size * count in the kzalloc() function.

Also, it is preferred to use sizeof(*pointer) instead of sizeof(type)
due to the type of the variable can change and one needs not change the
former (unlike the latter).

Link: https://www.kernel.org/doc/html/next/process/deprecated.html#open-coded-arithmetic-in-allocator-arguments [1]
Link: https://github.com/KSPP/linux/issues/162
Signed-off-by: Erick Archer <erick.archer@....com>
---
 drivers/net/wireless/intel/iwlegacy/common.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/net/wireless/intel/iwlegacy/common.c b/drivers/net/wireless/intel/iwlegacy/common.c
index 17570d62c896..9d33a66a49b5 100644
--- a/drivers/net/wireless/intel/iwlegacy/common.c
+++ b/drivers/net/wireless/intel/iwlegacy/common.c
@@ -3438,9 +3438,7 @@ il_init_geos(struct il_priv *il)
 	if (!channels)
 		return -ENOMEM;

-	rates =
-	    kzalloc((sizeof(struct ieee80211_rate) * RATE_COUNT_LEGACY),
-		    GFP_KERNEL);
+	rates = kcalloc(RATE_COUNT_LEGACY, sizeof(*rates), GFP_KERNEL);
 	if (!rates) {
 		kfree(channels);
 		return -ENOMEM;
--
2.25.1