linux-kernel - Re: [PATCH] NFC: st21nfca: fix double free

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Date:   Wed, 06 Nov 2019 21:50:58 -0800 (PST)
From:   David Miller <davem@...emloft.net>
To:     bianpan2016@....com
Cc:     tglx@...utronix.de, allison@...utok.net,
        kstewart@...uxfoundation.org, gregkh@...uxfoundation.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] NFC: st21nfca: fix double free

From: Pan Bian <bianpan2016@....com>
Date: Thu,  7 Nov 2019 09:33:20 +0800

> The variable nfcid_skb is not changed in the callee nfc_hci_get_param()
> if error occurs. Consequently, the freed variable nfcid_skb will be
> freed again, resulting in a double free bug. Set nfcid_skb to NULL after
> releasing it to fix the bug.
> 
> Signed-off-by: Pan Bian <bianpan2016@....com>

Applied and queued up for -stable.