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Message-ID: <d5ce0495-2f18-4176-90e5-7bba76132ea1@broadcom.com>
Date: Tue, 27 Feb 2024 20:40:40 +0100
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Subject: Re: [PATCH] wifi: brcm80211: handle pmk_op allocation failure
To: Joe Perches <joe@perches.com>, Duoming Zhou <duoming@zju.edu.cn>,
 linux-kernel@vger.kernel.org
Cc: brcm80211-dev-list.pdl@broadcom.com, brcm80211@lists.linux.dev,
 linux-wireless@vger.kernel.org, justinstitt@google.com, john@keeping.me.uk,
 quic_alokad@quicinc.com, marcan@marcan.st, johannes.berg@intel.com,
 linus.walleij@linaro.org, kvalo@kernel.org
References: <20240227080613.34001-1-duoming@zju.edu.cn>
 <87166784-79ab-4eb4-ad1e-af4bc31757b7@broadcom.com>
 <b0a352781f58a829deadffbe2ef2085c97c6ab32.camel@perches.com>
From: Arend van Spriel <arend.vanspriel@broadcom.com>
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In-Reply-To: <b0a352781f58a829deadffbe2ef2085c97c6ab32.camel@perches.com>
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On 2/27/2024 12:42 PM, Joe Perches wrote:
> On Tue, 2024-02-27 at 12:21 +0100, Arend van Spriel wrote:
>> On 2/27/2024 9:06 AM, Duoming Zhou wrote:
>>> The kzalloc() in brcmf_pmksa_v3_op() will return null if the
>>> physical memory has run out. As a result, if we dereference
>>> the null value, the null pointer dereference bug will happen.
>>>
>>> Return -ENOMEM from brcmf_pmksa_v3_op() if kzalloc() fails
>>> for pmk_op.
>>
>> NAK (see below)
>>
>> Also this issue was reported earlier by Joe Perches. Not sure if he
>> wants to be mentioned as such.
> 
> I think it's unimportant to be mentioned.
> 
> I think it's more important that the code be researched
> that the simple return of -ENOMEM the appropriate fix
> and is handled by all possible callers of the function.

Right. That is what I did after which I replied on Feb 18 to your email.

https://lore.kernel.org/all/3e1f11b3-a689-4c8e-bfda-b43649db7106@broadcom.com/

Regards,
Arend

>>
>>> Fixes: a96202acaea4 ("wifi: brcmfmac: cfg80211: Add support for PMKID_V3 operations")
>>> Signed-off-by: Duoming Zhou <duoming@zju.edu.cn>
>>> ---
>>>    drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c | 5 +++++
>>>    1 file changed, 5 insertions(+)
>>>
>>> diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.cq b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
>>> index 28d6a30cc01..3b420b33188 100644
>>> --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
>>> +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
>>> @@ -4322,6 +4322,10 @@ brcmf_pmksa_v3_op(struct brcmf_if *ifp, struct cfg80211_pmksa *pmksa,
>>>    	int ret;
>>>    
>>>    	pmk_op = kzalloc(sizeof(*pmk_op), GFP_KERNEL);
>>> +	if (!pmk_op) {
>>> +		ret = -ENOMEM;
>>> +		goto out;
>>> +	}
>>
>> There is really no need to introduce a new label for this. Although you
>> can kfree() a NULL pointer there is no need to do so when you know
>> already it is NULL. Just return -ENOMEM and be done with it.
>>
>> Regards,
>> Arend
>>
>>>    	pmk_op->version = cpu_to_le16(BRCMF_PMKSA_VER_3);
>>>    
>>>    	if (!pmksa) {
>>> @@ -4340,6 +4344,7 @@ brcmf_pmksa_v3_op(struct brcmf_if *ifp, struct cfg80211_pmksa *pmksa,
>>>    	pmk_op->length = cpu_to_le16(length);
>>>    
>>>    	ret = brcmf_fil_iovar_data_set(ifp, "pmkid_info", pmk_op, sizeof(*pmk_op));
>>> +out:
>>>    	kfree(pmk_op);
>>>    	return ret;
>>>    }
> 

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