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SubjectRe: [PATCH 2/2] ath9k: fix ath_tx_process_buffer() potential null ptr dereference
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On 2/16/21 12:53 AM, Felix Fietkau wrote:
>
> On 2021-02-16 08:03, Kalle Valo wrote:
>> Shuah Khan <skhan@linuxfoundation.org> wrote:
>>
>>> ath_tx_process_buffer() references ieee80211_find_sta_by_ifaddr()
>>> return pointer (sta) outside null check. Fix it by moving the code
>>> block under the null check.
>>>
>>> This problem was found while reviewing code to debug RCU warn from
>>> ath10k_wmi_tlv_parse_peer_stats_info() and a subsequent manual audit
>>> of other callers of ieee80211_find_sta_by_ifaddr() that don't hold
>>> RCU read lock.
>>>
>>> Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
>>> Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
>>
>> Patch applied to ath-next branch of ath.git, thanks.
>>
>> a56c14bb21b2 ath9k: fix ath_tx_process_buffer() potential null ptr dereference
> I just took another look at this patch, and it is completely bogus.
> Not only does the stated reason not make any sense (sta is simply passed
> to other functions, not dereferenced without checks), but this also
> introduces a horrible memory leak by skipping buffer completion if sta
> is NULL.
> Please drop it, the code is fine as-is.
>

A comment describing what you said here might be a good addition to this
comment block though.

thanks,
-- Shuah

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