netdev - Re: [PATCH v2] ath11k: mhi: fix potential memory leak in ath11k_mhi

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Date:   Mon, 30 May 2022 11:32:05 +0000 (UTC)
From:   Kalle Valo <kvalo@...nel.org>
To:     Jianglei Nie <niejianglei2021@....com>
Cc:     davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, ath11k@...ts.infradead.org,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Jianglei Nie <niejianglei2021@....com>
Subject: Re: [PATCH v2] ath11k: mhi: fix potential memory leak in
 ath11k_mhi_register()

Jianglei Nie <niejianglei2021@....com> wrote:

> mhi_alloc_controller() allocates a memory space for mhi_ctrl. When some
> errors occur, mhi_ctrl should be freed by mhi_free_controller() and set
> ab_pci->mhi_ctrl = NULL because ab_pci->mhi_ctrl has a dangling pointer
> to the freed memory. But when ath11k_mhi_read_addr_from_dt() fails, the
> function returns without calling mhi_free_controller(), which will lead
> to a memory leak.
> 
> We can fix it by calling mhi_free_controller() when
> ath11k_mhi_read_addr_from_dt() fails and set ab_pci->mhi_ctrl = NULL in
> all of the places where we call mhi_free_controller().
> 
> Signed-off-by: Jianglei Nie <niejianglei2021@....com>

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