linux-kernel - Re: [PATCH] brcmfmac: Fix a wild pointer dereference bug in brcmf_chip

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Message-ID: <YfPCahElneup1DJS@kroah.com>
Date:   Fri, 28 Jan 2022 11:16:10 +0100
From:   Greg KH <greg@...ah.com>
To:     Zhou Qingyang <zhou1615@....edu>
Cc:     kjlu@....edu, Arend van Spriel <aspriel@...il.com>,
        Franky Lin <franky.lin@...adcom.com>,
        Hante Meuleman <hante.meuleman@...adcom.com>,
        Chi-hsien Lin <chi-hsien.lin@...ineon.com>,
        Wright Feng <wright.feng@...ineon.com>,
        Chung-hsien Hsu <chung-hsien.hsu@...ineon.com>,
        Kalle Valo <kvalo@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Pieter-Paul Giesberts <pieter-paul.giesberts@...adcom.com>,
        Angus Ainslie <angus@...ea.ca>,
        "Daniel (Deognyoun) Kim" <dekim@...adcom.com>,
        "John W. Linville" <linville@...driver.com>,
        linux-wireless@...r.kernel.org,
        brcm80211-dev-list.pdl@...adcom.com,
        SHA-cyfmac-dev-list@...ineon.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] brcmfmac: Fix a wild pointer dereference bug in
 brcmf_chip_recognition()

On Tue, Jan 25, 2022 at 12:48:45AM +0800, Zhou Qingyang wrote:
> In brcmf_chip_recognition(), the return value of brcmf_chip_add_core()
> is assigned to core and is passed to brcmf_chip_sb_corerev(). In
> brcmf_chip_sb_corerev(), there exists dereference of core without check.
> the return value of brcmf_chip_add_core() could be ERR_PTR on failure of
> allocation, which could lead to a NULL pointer dereference bug.
> 
> Fix this bug by adding IS_ERR check for every variable core.
> 
> This bug was found by a static analyzer.
> 
> Builds with 'make allyesconfig' show no new warnings,
> and our static analyzer no longer warns about this code
> 
> Fixes: cb7cf7be9eba ("brcmfmac: make chip related functions host interface independent")
> Signed-off-by: Zhou Qingyang <zhou1615@....edu>
> ---
> The analysis employs differential checking to identify inconsistent 
> security operations (e.g., checks or kfrees) between two code paths 
> and confirms that the inconsistent operations are not recovered in the
> current function or the callers, so they constitute bugs. 
> 
> Note that, as a bug found by static analysis, it can be a false
> positive or hard to trigger. Multiple researchers have cross-reviewed
> the bug.

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