From a5812c68d849505ea657f653446512b85887f813 Mon Sep 17 00:00:00 2001
From: Arnd Bergmann <arnd@arndb.de>
Date: Wed, 22 Nov 2023 23:17:44 +0100
Subject: [PATCH] Bluetooth: hci_event: shut up a false-positive warning
Git-commit: a5812c68d849505ea657f653446512b85887f813
Patch-mainline: v6.7-rc7
References: git-fixes
Turning on -Wstringop-overflow globally exposed a misleading compiler
warning in bluetooth:
Net/bluetooth/hci_event.c: In function 'hci_cc_read_class_of_dev':
net/bluetooth/hci_event.c:524:9: error: 'memcpy' writing 3 bytes into a
region of size 0 overflows the destination [-Werror=stringop-overflow=]
524 | memcpy(hdev->dev_class, rp->dev_class, 3);
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
The problem here is the check for hdev being NULL in bt_dev_dbg() that
leads the compiler to conclude that hdev->dev_class might be an invalid
pointer access.
Add another explicit check for the same condition to make sure gcc sees
this cannot happen.
Fixes: a9de9248064b ("[Bluetooth] Switch from OGF+OCF to using only opcodes")
Fixes: 1b56c90018f0 ("Makefile: Enable -Wstringop-overflow globally")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
net/bluetooth/hci_event.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c
index a94decff233e..cc5fd290d529 100644
--- a/net/bluetooth/hci_event.c
+++ b/net/bluetooth/hci_event.c
@@ -516,6 +516,9 @@ static u8 hci_cc_read_class_of_dev(struct hci_dev *hdev, void *data,
{
struct hci_rp_read_class_of_dev *rp = data;
+ if (WARN_ON(!hdev))
+ return HCI_ERROR_UNSPECIFIED;
+
bt_dev_dbg(hdev, "status 0x%2.2x", rp->status);
if (rp->status)
--
2.35.3