linux-hardening - [PATCH] staging: rtl8723bs: Use kcalloc() instead of kzalloc()

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Date: Fri, 19 Jan 2024 18:39:00 +0100
From: Erick Archer <erick.archer@....com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Franziska Naepelt <franziska.naepelt@...glemail.com>,
	Hans de Goede <hdegoede@...hat.com>,
	Johannes Berg <johannes.berg@...el.com>,
	Jeff Johnson <quic_jjohnson@...cinc.com>,
	Aloka Dixit <quic_alokad@...cinc.com>,
	"Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc: Erick Archer <erick.archer@....com>,
	linux-staging@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	linux-hardening@...r.kernel.org
Subject: [PATCH] staging: rtl8723bs: 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
count * size 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/staging/rtl8723bs/os_dep/ioctl_cfg80211.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/staging/rtl8723bs/os_dep/ioctl_cfg80211.c b/drivers/staging/rtl8723bs/os_dep/ioctl_cfg80211.c
index 1ff763c10064..65a450fcdce7 100644
--- a/drivers/staging/rtl8723bs/os_dep/ioctl_cfg80211.c
+++ b/drivers/staging/rtl8723bs/os_dep/ioctl_cfg80211.c
@@ -1259,8 +1259,7 @@ static int cfg80211_rtw_scan(struct wiphy *wiphy
 		goto check_need_indicate_scan_done;
 	}

-	ssid = kzalloc(RTW_SSID_SCAN_AMOUNT * sizeof(struct ndis_802_11_ssid),
-		       GFP_KERNEL);
+	ssid = kcalloc(RTW_SSID_SCAN_AMOUNT, sizeof(*ssid), GFP_KERNEL);
 	if (!ssid) {
 		ret = -ENOMEM;
 		goto check_need_indicate_scan_done;
--
2.25.1