linux-kernel - [PATCH 5.10/5.15 0/1] Bluetooth: Fix deadlock in vhci_send

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Date: Wed, 21 Feb 2024 17:57:43 +0300
From: Daniil Dulov <d.dulov@...ddin.ru>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, <stable@...r.kernel.org>
CC: Daniil Dulov <d.dulov@...ddin.ru>, Marcel Holtmann <marcel@...tmann.org>,
	Johan Hedberg <johan.hedberg@...il.com>, Luiz Augusto von Dentz
	<luiz.dentz@...il.com>, Arkadiusz Bokowy <arkadiusz.bokowy@...il.com>,
	<linux-bluetooth@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<lvc-project@...uxtesting.org>
Subject: [PATCH 5.10/5.15 0/1] Bluetooth: Fix deadlock in vhci_send_frame

Syzkaller reports a potential circular dependency leading to deadlock
in 5.10 and 5.15 stable releases since the commit
92d4abd66f70 ("Bluetooth: vhci: Fix race when opening vhci device")
that caused this crash was backported to these branches.
The problem has been fixed by the following upstream patch that was
adapted to 5.10 and 5.15. All of the changes made to the patch
in order to adapt it are described at the end of commit message.

This patch has already been backported to the following stable branches:
v6.6 - https://lore.kernel.org/stable/20231230115814.038261305@linuxfoundation.org/
v6.1 - https://lore.kernel.org/stable/20231230115807.749489379@linuxfoundation.org/

Found by Linux Verification Center (linuxtesting.org) with Syzkaller.