linux-kernel - Re: [PATCH v3] staging: rtl8723bs: fix potential memory leak in _rtw_init_xmit

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Date:   Tue, 27 Sep 2022 10:59:30 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     xkernel.wang@...mail.com
Cc:     gregkh@...uxfoundation.org, linux-staging@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] staging: rtl8723bs: fix potential memory leak in
 _rtw_init_xmit_priv()

On Mon, Sep 26, 2022 at 03:54:57PM +0800, xkernel.wang@...mail.com wrote:
> From: Xiaoke Wang <xkernel.wang@...mail.com>
> 
> In _rtw_init_xmit_priv(), there are seven error paths for allocation
> failures without releasing the resources but directly goto `exit`, while
> the exit section only executes `return res;`, which can lead to various
> memory leaks.
> 
> To properly release them, this patch unifies the error handlers of
> _rtw_init_xmit_priv() and several error handling paths are added.
> According to the allocation sequence, each error will jump to its
> corresponding error handling tag.
> 
> As there is no proper device to test with, no runtime testing was
> performed.
> 
> Signed-off-by: Xiaoke Wang <xkernel.wang@...mail.com>

This seems to introduce a similar use after free as mentioned in the
change to the other rtl driver.

list_add() followed by a free.

regards,
dan carpenter