From: "Gustavo A. R. Silva" <gustavo@embeddedor.com>
To: Ben Greear <greearb@candelatech.com>,
Kalle Valo <kvalo@codeaurora.org>,
"David S. Miller" <davem@davemloft.net>
Cc: ath10k@lists.infradead.org, linux-wireless@vger.kernel.org,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] ath10k: htt_rx: Fix signedness bug in ath10k_update_per_peer_tx_stats
Date: Fri, 5 Oct 2018 21:14:27 +0200 [thread overview]
Message-ID: <dd75a8aa-b87c-e325-cc1d-a0efe3664a32@embeddedor.com> (raw)
In-Reply-To: <3a55bec6-d20d-f500-e741-b228a86b7117@candelatech.com>
On 10/5/18 9:09 PM, Ben Greear wrote:
> On 10/05/2018 11:42 AM, Gustavo A. R. Silva wrote:
>> Currently, the error handling for the call to function
>> ath10k_get_legacy_rate_idx() doesn't work because
>> *rate_idx* is of type u8 (8 bits, unsigned), which
>> makes it impossible for it to hold a value less
>> than 0.
>>
>> Fix this by changing the type of variable *rate_idx*
>> to s8 (8 bits, signed).
>
> There are more than 127 rates, are you sure this is doing
> what you want?
>
Based on the following function, rate_idx can only hold values from 0 to 11
static inline int ath10k_get_legacy_rate_idx(struct ath10k *ar, u8 rate)
{
static const u8 legacy_rates[] = {1, 2, 5, 11, 6, 9, 12,
18, 24, 36, 48, 54};
int i;
for (i = 0; i < ARRAY_SIZE(legacy_rates); i++) {
if (rate == legacy_rates[i])
return i;
}
ath10k_warn(ar, "Invalid legacy rate %hhd peer stats", rate);
return -EINVAL;
}
Thanks
--
Gustavo
> Thanks,
> Ben
>
>>
>> Addresses-Coverity-ID: 1473914 ("Unsigned compared against 0")
>> Fixes: 0189dbd71cbd ("ath10k: get the legacy rate index to update the txrate table")
>> Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
>> ---
>> drivers/net/wireless/ath/ath10k/htt_rx.c | 3 ++-
>> 1 file changed, 2 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/net/wireless/ath/ath10k/htt_rx.c b/drivers/net/wireless/ath/ath10k/htt_rx.c
>> index f240525..edd0e74 100644
>> --- a/drivers/net/wireless/ath/ath10k/htt_rx.c
>> +++ b/drivers/net/wireless/ath/ath10k/htt_rx.c
>> @@ -2753,7 +2753,8 @@ ath10k_update_per_peer_tx_stats(struct ath10k *ar,
>> struct ath10k_per_peer_tx_stats *peer_stats)
>> {
>> struct ath10k_sta *arsta = (struct ath10k_sta *)sta->drv_priv;
>> - u8 rate = 0, rate_idx = 0, sgi;
>> + u8 rate = 0, sgi;
>> + s8 rate_idx = 0;
>> struct rate_info txrate;
>>
>> lockdep_assert_held(&ar->data_lock);
>>
>
>
next prev parent reply other threads:[~2018-10-05 19:14 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-05 18:42 [PATCH] ath10k: htt_rx: Fix signedness bug in ath10k_update_per_peer_tx_stats Gustavo A. R. Silva
2018-10-05 19:09 ` Ben Greear
2018-10-05 19:14 ` Gustavo A. R. Silva [this message]
2018-10-05 19:15 ` Gustavo A. R. Silva
2018-10-08 6:38 ` Anilkumar Kolli
2018-10-09 19:19 ` Gustavo A. R. Silva
2018-10-13 17:23 ` Kalle Valo
[not found] ` <20181013172330.1CC8E60BFE@smtp.codeaurora.org>
2018-10-13 18:26 ` Gustavo A. R. Silva
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