linux-kernel - [PATCH AUTOSEL 4.19 11/11] Bluetooth: btintel: Fix null ptr deref in btintel_read

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Message-ID: <20240329123522.3086878-11-sashal@kernel.org>
Date: Fri, 29 Mar 2024 08:35:17 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Edward Adam Davis <eadavis@...com>,
	syzbot+830d9e3fa61968246abd@...kaller.appspotmail.com,
	Luiz Augusto von Dentz <luiz.von.dentz@...el.com>,
	Sasha Levin <sashal@...nel.org>,
	marcel@...tmann.org,
	luiz.dentz@...il.com,
	linux-bluetooth@...r.kernel.org
Subject: [PATCH AUTOSEL 4.19 11/11] Bluetooth: btintel: Fix null ptr deref in btintel_read_version

From: Edward Adam Davis <eadavis@...com>

[ Upstream commit b79e040910101b020931ba0c9a6b77e81ab7f645 ]

If hci_cmd_sync_complete() is triggered and skb is NULL, then
hdev->req_skb is NULL, which will cause this issue.

Reported-and-tested-by: syzbot+830d9e3fa61968246abd@...kaller.appspotmail.com
Signed-off-by: Edward Adam Davis <eadavis@...com>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@...el.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/bluetooth/btintel.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/bluetooth/btintel.c b/drivers/bluetooth/btintel.c
index 5270d55132015..6a3c0ad9f10ce 100644
--- a/drivers/bluetooth/btintel.c
+++ b/drivers/bluetooth/btintel.c
@@ -355,7 +355,7 @@ int btintel_read_version(struct hci_dev *hdev, struct intel_version *ver)
 	struct sk_buff *skb;
 
 	skb = __hci_cmd_sync(hdev, 0xfc05, 0, NULL, HCI_CMD_TIMEOUT);
-	if (IS_ERR(skb)) {
+	if (IS_ERR_OR_NULL(skb)) {
 		bt_dev_err(hdev, "Reading Intel version information failed (%ld)",
 			   PTR_ERR(skb));
 		return PTR_ERR(skb);
-- 
2.43.0