linux-kernel - Re: [PATCH] Bluetooth: HCI: Fix global-out-of-bounds

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Message-ID: <ZBmaNIij3IRXRwaT@corigine.com>
Date:   Tue, 21 Mar 2023 12:51:16 +0100
From:   Simon Horman <simon.horman@...igine.com>
To:     Sungwoo Kim <iam@...g-woo.kim>
Cc:     wuruoyu@...com, benquike@...il.com, daveti@...due.edu,
        Marcel Holtmann <marcel@...tmann.org>,
        Johan Hedberg <johan.hedberg@...il.com>,
        Luiz Augusto von Dentz <luiz.dentz@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        linux-bluetooth@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Bluetooth: HCI: Fix global-out-of-bounds

On Mon, Mar 20, 2023 at 09:50:18PM -0400, Sungwoo Kim wrote:
> To loop a variable-length array, hci_init_stage_sync(stage) considers
> that stage[i] is valid as long as stage[i-1].func is valid.
> Thus, the last element of stage[].func should be intentionally invalid
> as hci_init0[], le_init2[], and others did.
> However, amp_init1[] and amp_init2[] have no invalid element, letting
> hci_init_stage_sync() keep accessing amp_init1[] over its valid range.
> This patch fixes this by adding {} in the last of amp_init1[] and
> amp_init2[].

...

> This bug is found by FuzzBT, a modified version of Syzkaller.
> Other contributors for this bug are Ruoyu Wu and Peng Hui.
> 
> Fixes: d0b137062b2d ("Bluetooth: hci_sync: Rework init stages")
> Signed-off-by: Sungwoo Kim <iam@...g-woo.kim>

Reviewed-by: Simon Horman <simon.horman@...igine.com>


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