linux-kernel - [PATCH AUTOSEL 5.18 03/22] staging: rtl8723bs: Allocate full pwep structure

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Message-Id: <20220621204928.249907-3-sashal@kernel.org>
Date:   Tue, 21 Jun 2022 16:49:09 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Kees Cook <keescook@...omium.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Fabio Aiuto <fabioaiuto83@...il.com>,
        Hans de Goede <hdegoede@...hat.com>,
        linux-staging@...ts.linux.dev, Sasha Levin <sashal@...nel.org>,
        straube.linux@...il.com, arnd@...db.de
Subject: [PATCH AUTOSEL 5.18 03/22] staging: rtl8723bs: Allocate full pwep structure

From: Kees Cook <keescook@...omium.org>

[ Upstream commit 67ea0a2adbf667cd6da4965fbcfd0da741035084 ]

The pwep allocation was always being allocated smaller than the true
structure size. Avoid this by always allocating the full structure.
Found with GCC 12 and -Warray-bounds:

../drivers/staging/rtl8723bs/os_dep/ioctl_linux.c: In function 'rtw_set_encryption':
../drivers/staging/rtl8723bs/os_dep/ioctl_linux.c:591:29: warning: array subscript 'struct ndis_802_11_wep[0]' is partly outside array bounds of 'void[25]' [-Warray-bounds]
  591 |                         pwep->length = wep_total_len;
      |                             ^~

Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Fabio Aiuto <fabioaiuto83@...il.com>
Cc: Hans de Goede <hdegoede@...hat.com>
Cc: linux-staging@...ts.linux.dev
Signed-off-by: Kees Cook <keescook@...omium.org>
Link: https://lore.kernel.org/r/20220608215512.1070847-1-keescook@chromium.org
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/staging/rtl8723bs/os_dep/ioctl_linux.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/rtl8723bs/os_dep/ioctl_linux.c b/drivers/staging/rtl8723bs/os_dep/ioctl_linux.c
index ece97e37ac91..30374a820496 100644
--- a/drivers/staging/rtl8723bs/os_dep/ioctl_linux.c
+++ b/drivers/staging/rtl8723bs/os_dep/ioctl_linux.c
@@ -90,7 +90,8 @@ static int wpa_set_encryption(struct net_device *dev, struct ieee_param *param,
 		if (wep_key_len > 0) {
 			wep_key_len = wep_key_len <= 5 ? 5 : 13;
 			wep_total_len = wep_key_len + FIELD_OFFSET(struct ndis_802_11_wep, key_material);
-			pwep = kzalloc(wep_total_len, GFP_KERNEL);
+			/* Allocate a full structure to avoid potentially running off the end. */
+			pwep = kzalloc(sizeof(*pwep), GFP_KERNEL);
 			if (!pwep) {
 				ret = -ENOMEM;
 				goto exit;
@@ -582,7 +583,8 @@ static int rtw_set_encryption(struct net_device *dev, struct ieee_param *param,
 		if (wep_key_len > 0) {
 			wep_key_len = wep_key_len <= 5 ? 5 : 13;
 			wep_total_len = wep_key_len + FIELD_OFFSET(struct ndis_802_11_wep, key_material);
-			pwep = kzalloc(wep_total_len, GFP_KERNEL);
+			/* Allocate a full structure to avoid potentially running off the end. */
+			pwep = kzalloc(sizeof(*pwep), GFP_KERNEL);
 			if (!pwep)
 				goto exit;
 
-- 
2.35.1