linux-kernel - Re: [PATCH] staging: rtl8192e: fix potential use after free

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Date:   Tue, 5 Nov 2019 17:58:51 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Pan Bian <bianpan2016@....com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Himadri Pandya <himadri18.07@...il.com>,
        YueHaibing <yuehaibing@...wei.com>,
        Colin Ian King <colin.king@...onical.com>,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: rtl8192e: fix potential use after free

On Tue, Nov 05, 2019 at 10:49:11PM +0800, Pan Bian wrote:
> The variable skb is released via kfree_skb() when the return value of
> _rtl92e_tx is not zero. However, after that, skb is accessed again to
> read its length, which may result in a use after free bug. This patch
> fixes the bug by moving the release operation to where skb is never
> used later.
> 
> Signed-off-by: Pan Bian <bianpan2016@....com>

Reviewed-by: Dan Carpenter <dan.carpenter@...cle.com>

regards,
dan carpenter