linux-kernel - [PATCH 6.1 203/451] Bluetooth: hci_core: Fix possible buffer overflow

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Date: Sun, 24 Mar 2024 19:07:59 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Luiz Augusto von Dentz <luiz.von.dentz@...el.com>,
	Sasha Levin <sashal@...nel.org>
Subject: [PATCH 6.1 203/451] Bluetooth: hci_core: Fix possible buffer overflow

From: Luiz Augusto von Dentz <luiz.von.dentz@...el.com>

[ Upstream commit 81137162bfaa7278785b24c1fd2e9e74f082e8e4 ]

struct hci_dev_info has a fixed size name[8] field so in the event that
hdev->name is bigger than that strcpy would attempt to write past its
size, so this fixes this problem by switching to use strscpy.

Fixes: dcda165706b9 ("Bluetooth: hci_core: Fix build warnings")
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@...el.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 net/bluetooth/hci_core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
index e0c924df13b58..88e9d7e0865a2 100644
--- a/net/bluetooth/hci_core.c
+++ b/net/bluetooth/hci_core.c
@@ -908,7 +908,7 @@ int hci_get_dev_info(void __user *arg)
 	else
 		flags = hdev->flags;
 
-	strcpy(di.name, hdev->name);
+	strscpy(di.name, hdev->name, sizeof(di.name));
 	di.bdaddr   = hdev->bdaddr;
 	di.type     = (hdev->bus & 0x0f) | ((hdev->dev_type & 0x03) << 4);
 	di.flags    = flags;
-- 
2.43.0