linux-kernel - [PATCH 6.6 292/638] wifi: brcm80211: handle pmk

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Date: Sun, 24 Mar 2024 18:55:29 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Duoming Zhou <duoming@....edu.cn>,
	Arend van Spriel <arend.vanspriel@...adcom.com>,
	Kees Cook <keescook@...omium.org>,
	Kalle Valo <kvalo@...nel.org>,
	Sasha Levin <sashal@...nel.org>
Subject: [PATCH 6.6 292/638] wifi: brcm80211: handle pmk_op allocation failure

From: Duoming Zhou <duoming@....edu.cn>

[ Upstream commit b4152222e04cb8afeeca239c90e3fcaf4c553b42 ]

The kzalloc() in brcmf_pmksa_v3_op() will return null if the
physical memory has run out. As a result, if we dereference
the null value, the null pointer dereference bug will happen.

Return -ENOMEM from brcmf_pmksa_v3_op() if kzalloc() fails
for pmk_op.

Fixes: a96202acaea4 ("wifi: brcmfmac: cfg80211: Add support for PMKID_V3 operations")
Acked-by: Arend van Spriel <arend.vanspriel@...adcom.com>
Signed-off-by: Duoming Zhou <duoming@....edu.cn>
Reviewed-by: Kees Cook <keescook@...omium.org>
Signed-off-by: Kalle Valo <kvalo@...nel.org>
Link: https://msgid.link/20240229103153.18533-1-duoming@zju.edu.cn
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
index 6049f9a761d9d..df9c26593dbe1 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
@@ -4323,6 +4323,9 @@ brcmf_pmksa_v3_op(struct brcmf_if *ifp, struct cfg80211_pmksa *pmksa,
 	int ret;
 
 	pmk_op = kzalloc(sizeof(*pmk_op), GFP_KERNEL);
+	if (!pmk_op)
+		return -ENOMEM;
+
 	pmk_op->version = cpu_to_le16(BRCMF_PMKSA_VER_3);
 
 	if (!pmksa) {
-- 
2.43.0