linux-kernel - Re: [kvalo-ath:pending 52/56] drivers/net/wireless/ath/ath11k/wmi.c:5651 ath11k_wmi_tlv_fw_stats_data_parse() error: uninitialized symbol 'len'.

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Message-ID: <874k6auz4x.fsf@kernel.org>
Date:   Tue, 11 Jan 2022 16:26:38 +0200
From:   Kalle Valo <kvalo@...nel.org>
To:     Dan Carpenter <dan.carpenter@...cle.com>
Cc:     kbuild@...ts.01.org, Wen Gong <quic_wgong@...cinc.com>,
        lkp@...el.com, kbuild-all@...ts.01.org, ath11k@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [kvalo-ath:pending 52/56] drivers/net/wireless/ath/ath11k/wmi.c:5651 ath11k_wmi_tlv_fw_stats_data_parse() error: uninitialized symbol 'len'.

Dan Carpenter <dan.carpenter@...cle.com> writes:

> On Tue, Jan 11, 2022 at 03:35:26PM +0200, Kalle Valo wrote:
>> > bc5c448b70ff14 Wen Gong 2021-12-08 5629 static int
>> > ath11k_wmi_tlv_fw_stats_data_parse(struct ath11k_base *ab,
>> > bc5c448b70ff14 Wen Gong 2021-12-08 5630 struct wmi_tlv_fw_stats_parse
>> > *parse,
>> > bc5c448b70ff14 Wen Gong 2021-12-08 5631 const void *ptr)
>> > bc5c448b70ff14 Wen Gong   2021-12-08  5632  {
>> > bc5c448b70ff14 Wen Gong 2021-12-08 5633 struct ath11k_fw_stats *stats
>> > = parse->stats;
>> > bc5c448b70ff14 Wen Gong 2021-12-08 5634 const struct wmi_stats_event
>> > *ev = parse->ev;
>> > bc5c448b70ff14 Wen Gong   2021-12-08  5635  	int i;
>> > bc5c448b70ff14 Wen Gong   2021-12-08  5636  	const void *data = ptr;
>> > bc5c448b70ff14 Wen Gong   2021-12-08  5637  	u32 len;
>                                                         ^^^^^^^^
> "len" is a local variable, not a parameter.

Ah, I only looked at the current ath-next branch.

>> > bc5c448b70ff14 Wen Gong   2021-12-08  5638  
>> > bc5c448b70ff14 Wen Gong   2021-12-08  5639  	if (!ev) {
>> > bc5c448b70ff14 Wen Gong 2021-12-08 5640 ath11k_warn(ab, "failed to
>> > fetch update stats ev");
>> > bc5c448b70ff14 Wen Gong   2021-12-08  5641  		return -EPROTO;
>> > bc5c448b70ff14 Wen Gong   2021-12-08  5642  	}
>> > d5c65159f28953 Kalle Valo 2019-11-23  5643  
>> > d5c65159f28953 Kalle Valo 2019-11-23  5644  	stats->stats_id = 0;
>> > d5c65159f28953 Kalle Valo 2019-11-23  5645  
>> > d5c65159f28953 Kalle Valo 2019-11-23 5646 for (i = 0; i <
>> > ev->num_pdev_stats; i++) {
>> > d5c65159f28953 Kalle Valo 2019-11-23 5647 const struct wmi_pdev_stats
>> > *src;
>> > d5c65159f28953 Kalle Valo 2019-11-23 5648 struct ath11k_fw_stats_pdev
>> > *dst;
>> > d5c65159f28953 Kalle Valo 2019-11-23  5649  
>> > d5c65159f28953 Kalle Valo 2019-11-23  5650  		src = data;
>> > bc5c448b70ff14 Wen Gong 2021-12-08 @5651 if (len < sizeof(*src))
>> >
>> > "len" is never initialized.
>> 
>> I only quickly looked at this, but AFAICS ath11k_wmi_tlv_iter() provides
>> len to ath11k_wmi_tlv_fw_stats_parse() which again provides len to
>> ath11k_wmi_tlv_fw_stats_data_parse(). I'm not seeing how this is
>> uninitalised, did I miss something?
>
> I think the bug was fixed and the tree was rebased?

Most likely there were some changes, but I can't remember anymore. Too
many patches :)

> I only look at the email and hit forward and the code in the email was
> clearly buggy but tree looks okay now as you say.

Good, thanks for checking.

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