linux-kernel - [PATCH] wifi: brcm80211: handle pmk

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Message-Id: <20240227080613.34001-1-duoming@zju.edu.cn>
Date: Tue, 27 Feb 2024 16:06:13 +0800
From: Duoming Zhou <duoming@....edu.cn>
To: linux-kernel@...r.kernel.org
Cc: brcm80211-dev-list.pdl@...adcom.com,
	brcm80211@...ts.linux.dev,
	linux-wireless@...r.kernel.org,
	justinstitt@...gle.com,
	john@...ping.me.uk,
	quic_alokad@...cinc.com,
	marcan@...can.st,
	johannes.berg@...el.com,
	linus.walleij@...aro.org,
	kvalo@...nel.org,
	arend.vanspriel@...adcom.com,
	Duoming Zhou <duoming@....edu.cn>
Subject: [PATCH] wifi: brcm80211: handle pmk_op allocation failure

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")
Signed-off-by: Duoming Zhou <duoming@....edu.cn>
---
 drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
index 28d6a30cc01..3b420b33188 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
@@ -4322,6 +4322,10 @@ 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) {
+		ret = -ENOMEM;
+		goto out;
+	}
 	pmk_op->version = cpu_to_le16(BRCMF_PMKSA_VER_3);
 
 	if (!pmksa) {
@@ -4340,6 +4344,7 @@ brcmf_pmksa_v3_op(struct brcmf_if *ifp, struct cfg80211_pmksa *pmksa,
 	pmk_op->length = cpu_to_le16(length);
 
 	ret = brcmf_fil_iovar_data_set(ifp, "pmkid_info", pmk_op, sizeof(*pmk_op));
+out:
 	kfree(pmk_op);
 	return ret;
 }
-- 
2.17.1