linux-kernel - [PATCH 5.15 331/917] Bluetooth: hci_uart: fix GPF in h5

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Message-Id: <20211115165439.981950411@linuxfoundation.org>
Date:   Mon, 15 Nov 2021 17:57:06 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Pavel Skripkin <paskripkin@...il.com>,
        Marcel Holtmann <marcel@...tmann.org>,
        Sasha Levin <sashal@...nel.org>,
        syzbot+7d41312fe3f123a6f605@...kaller.appspotmail.com
Subject: [PATCH 5.15 331/917] Bluetooth: hci_uart: fix GPF in h5_recv

From: Pavel Skripkin <paskripkin@...il.com>

[ Upstream commit 2fc7acb69fa3573d4bf7a90c323296d840daf330 ]

Syzbot hit general protection fault in h5_recv(). The problem was in
missing NULL check.

hu->serdev can be NULL and we cannot blindly pass &serdev->dev
somewhere, since it can cause GPF.

Fixes: d9dd833cf6d2 ("Bluetooth: hci_h5: Add runtime suspend")
Reported-and-tested-by: syzbot+7d41312fe3f123a6f605@...kaller.appspotmail.com
Signed-off-by: Pavel Skripkin <paskripkin@...il.com>
Signed-off-by: Marcel Holtmann <marcel@...tmann.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/bluetooth/hci_h5.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/bluetooth/hci_h5.c b/drivers/bluetooth/hci_h5.c
index 0c0dedece59c5..eb0099a212888 100644
--- a/drivers/bluetooth/hci_h5.c
+++ b/drivers/bluetooth/hci_h5.c
@@ -587,9 +587,11 @@ static int h5_recv(struct hci_uart *hu, const void *data, int count)
 		count -= processed;
 	}
 
-	pm_runtime_get(&hu->serdev->dev);
-	pm_runtime_mark_last_busy(&hu->serdev->dev);
-	pm_runtime_put_autosuspend(&hu->serdev->dev);
+	if (hu->serdev) {
+		pm_runtime_get(&hu->serdev->dev);
+		pm_runtime_mark_last_busy(&hu->serdev->dev);
+		pm_runtime_put_autosuspend(&hu->serdev->dev);
+	}
 
 	return 0;
 }
-- 
2.33.0