linux-kernel - [PATCH 5.10 27/63] Bluetooth: hci_h5: close serdev device and free hu in h5

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20210104155710.140204212@linuxfoundation.org>
Date:   Mon,  4 Jan 2021 16:57:20 +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,
        syzbot+6ce141c55b2f7aafd1c4@...kaller.appspotmail.com,
        Anant Thazhemadam <anant.thazhemadam@...il.com>,
        Marcel Holtmann <marcel@...tmann.org>
Subject: [PATCH 5.10 27/63] Bluetooth: hci_h5: close serdev device and free hu in h5_close

From: Anant Thazhemadam <anant.thazhemadam@...il.com>

commit 70f259a3f4276b71db365b1d6ff1eab805ea6ec3 upstream.

When h5_close() gets called, the memory allocated for the hu gets
freed only if hu->serdev doesn't exist. This leads to a memory leak.
So when h5_close() is requested, close the serdev device instance and
free the memory allocated to the hu entirely instead.

Fixes: https://syzkaller.appspot.com/bug?extid=6ce141c55b2f7aafd1c4
Reported-by: syzbot+6ce141c55b2f7aafd1c4@...kaller.appspotmail.com
Tested-by: syzbot+6ce141c55b2f7aafd1c4@...kaller.appspotmail.com
Signed-off-by: Anant Thazhemadam <anant.thazhemadam@...il.com>
Signed-off-by: Marcel Holtmann <marcel@...tmann.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/bluetooth/hci_h5.c |    8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

--- a/drivers/bluetooth/hci_h5.c
+++ b/drivers/bluetooth/hci_h5.c
@@ -251,8 +251,12 @@ static int h5_close(struct hci_uart *hu)
 	if (h5->vnd && h5->vnd->close)
 		h5->vnd->close(h5);
 
-	if (!hu->serdev)
-		kfree(h5);
+	if (hu->serdev)
+		serdev_device_close(hu->serdev);
+
+	kfree_skb(h5->rx_skb);
+	kfree(h5);
+	h5 = NULL;
 
 	return 0;
 }