linux-kernel - [PATCH 5.16 0288/1039] ath11k: Fix a NULL pointer dereference in ath11k_mac_op_hw

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20220124184134.963810672@linuxfoundation.org>
Date:   Mon, 24 Jan 2022 19:34:37 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Zhou Qingyang <zhou1615@....edu>,
        Kalle Valo <quic_kvalo@...cinc.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.16 0288/1039] ath11k: Fix a NULL pointer dereference in ath11k_mac_op_hw_scan()

From: Zhou Qingyang <zhou1615@....edu>

[ Upstream commit eccd25136386a04ebf46a64f3a34e8e0fab6d9e1 ]

In ath11k_mac_op_hw_scan(), the return value of kzalloc() is directly
used in memcpy(), which may lead to a NULL pointer dereference on
failure of kzalloc().

Fix this bug by adding a check of arg.extraie.ptr.

This bug was found by a static analyzer. The analysis employs
differential checking to identify inconsistent security operations
(e.g., checks or kfrees) between two code paths and confirms that the
inconsistent operations are not recovered in the current function or
the callers, so they constitute bugs.

Note that, as a bug found by static analysis, it can be a false
positive or hard to trigger. Multiple researchers have cross-reviewed
the bug.

Builds with CONFIG_ATH11K=m show no new warnings, and our static
analyzer no longer warns about this code.

Fixes: d5c65159f289 ("ath11k: driver for Qualcomm IEEE 802.11ax devices")
Signed-off-by: Zhou Qingyang <zhou1615@....edu>
Signed-off-by: Kalle Valo <quic_kvalo@...cinc.com>
Link: https://lore.kernel.org/r/20211202155348.71315-1-zhou1615@umn.edu
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/wireless/ath/ath11k/mac.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireless/ath/ath11k/mac.c b/drivers/net/wireless/ath/ath11k/mac.c
index 67be109eda910..5d49a7ea51fae 100644
--- a/drivers/net/wireless/ath/ath11k/mac.c
+++ b/drivers/net/wireless/ath/ath11k/mac.c
@@ -3241,9 +3241,12 @@ static int ath11k_mac_op_hw_scan(struct ieee80211_hw *hw,
 	arg.scan_id = ATH11K_SCAN_ID;

 	if (req->ie_len) {
+		arg.extraie.ptr = kmemdup(req->ie, req->ie_len, GFP_KERNEL);
+		if (!arg.extraie.ptr) {
+			ret = -ENOMEM;
+			goto exit;
+		}
 		arg.extraie.len = req->ie_len;
-		arg.extraie.ptr = kzalloc(req->ie_len, GFP_KERNEL);
-		memcpy(arg.extraie.ptr, req->ie, req->ie_len);
 	}

 	if (req->n_ssids) {
-- 
2.34.1