linux-kernel - Re: [PATCH] staging: r8188eu: do not write past the end of an array

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Message-ID: <71fb25dd-b695-47ac-2bfc-7e7cb2baf6c5@gmail.com>
Date:   Sat, 18 Sep 2021 16:26:33 +0200
From:   Michael Straube <straube.linux@...il.com>
To:     Martin Kaiser <martin@...ser.cx>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Larry Finger <Larry.Finger@...inger.net>,
        Phillip Potter <phil@...lpotter.co.uk>,
        linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: r8188eu: do not write past the end of an array

On 9/18/21 15:40, Martin Kaiser wrote:
> Commit f7b687d6b67e ("staging: r8188eu: remove NumTotalRFPath from struct
> hal_data_8188e") removed a for loop around a block of code that is executed
> only once when i == 0. However, without the for loop, i will never be set
> to 0 before the code block is executed. i remains at 2, which is the final
> value after the previous loop. This results in a write past the end of the
> powerlevel and MCSBase arrays.
> 
> [   28.480809] Kernel panic - not syncing: stack-protector: Kernel stack is corrupted in: rtl8188e_PHY_RF6052SetOFDMTxPower+0x124/0x128 [r8188eu]
> [   28.493752] ---[ end Kernel panic - not syncing: stack-protector: Kernel stack is corrupted in: rtl8188e_PHY_RF6052SetOFDMTxPower+0x124/0x128 [r8188eu] ]---
> 
> Fix this by replacing i with 0 in the code block that used to be the body of
> the loop. While at it, remove the powerlevel array that was just holding a
> temporary value.
> 

Oh, I missed that.
Many thanks for fixing this, Martin. Looks good to me.

Acked-by: Michael Straube <straube.linux@...il.com>

Thanks,
Michael