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

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Date:   Fri, 28 Jan 2022 12:31:44 +0200
From:   Kalle Valo <kvalo@...nel.org>
To:     Greg KH <greg@...ah.com>
Cc:     Zhou Qingyang <zhou1615@....edu>, 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>,
        "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()

Greg KH <greg@...ah.com> writes:

> 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.
>
> As stated before, umn.edu is still not allowed to contribute to the
> Linux kernel.  Please work with your administration to resolve this
> issue.

Thanks Greg, I didn't notice that this is from umn.edu. After seeing
what kind of "research" umn.edu does I will not even look at umn.edu
patches, they all will be automatically rejected without comments.

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