linux-kernel - [PATCH] bluetooth: Add check for mgmt_alloc

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Message-Id: <20250218133548.2564549-1-haoxiang_li2024@163.com>
Date: Tue, 18 Feb 2025 21:35:48 +0800
From: Haoxiang Li <haoxiang_li2024@....com>
To: marcel@...tmann.org,
	johan.hedberg@...il.com,
	luiz.dentz@...il.com,
	mm@...ihalf.com,
	rad@...ihalf.com,
	acz@...ihalf.com
Cc: linux-bluetooth@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Haoxiang Li <haoxiang_li2024@....com>,
	stable@...r.kernel.org
Subject: [PATCH] bluetooth: Add check for mgmt_alloc_skb()

Add check for the return value of mgmt_alloc_skb() in
mgmt_remote_name() to prevent null pointer dereference.

Fixes: ba17bb62ce41 ("Bluetooth: Fix skb allocation in mgmt_remote_name() & mgmt_device_connected()")
Cc: stable@...r.kernel.org
Signed-off-by: Haoxiang Li <haoxiang_li2024@....com>
---
 net/bluetooth/mgmt.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/bluetooth/mgmt.c b/net/bluetooth/mgmt.c
index f53304cb09db..8383e5ae95be 100644
--- a/net/bluetooth/mgmt.c
+++ b/net/bluetooth/mgmt.c
@@ -10413,7 +10413,8 @@ void mgmt_remote_name(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 link_type,
 
 	skb = mgmt_alloc_skb(hdev, MGMT_EV_DEVICE_FOUND,
 			     sizeof(*ev) + (name ? eir_precalc_len(name_len) : 0));
-
+	if (!skb)
+		return;
 	ev = skb_put(skb, sizeof(*ev));
 	bacpy(&ev->addr.bdaddr, bdaddr);
 	ev->addr.type = link_to_bdaddr(link_type, addr_type);
-- 
2.25.1