i know. saw that later too. code should be safe
Am 02.11.2017 um 20:34 schrieb Christian Lamparter:
On Wednesday, November 1, 2017 9:37:53 PM CET Sebastian Gottschall wrote:
a additional array bounds check would be good
Ah, about that:
the bw variable in ath10k_htt_rx_h_rates() is extracted from info2
in the following way [0]:
| bw = info2 & 3;
the txrate.bw variable in ath10k_update_per_peer_tx_stats() is set by [1]:
| txrate.bw = ATH10K_HW_BW(peer_stats->flags);
ATH10K_HW_BW is a macro defined as [2]:
| #define ATH10K_HW_BW(flags) (((flags) >> 3) & 0x3)
In both cases the bandwidth values already are limited to 0-3 by
the "and 3" operation.
[0]
<https://elixir.free-electrons.com/linux/v4.14-rc7/source/drivers/net/wireless/ath/ath10k/htt_rx.c#L646>
[1]
<https://elixir.free-electrons.com/linux/v4.14-rc7/source/drivers/net/wireless/ath/ath10k/htt_rx.c#L2254>
[2]
<https://elixir.free-electrons.com/linux/v4.14-rc7/source/drivers/net/wireless/ath/ath10k/wmi.h#L4810>
@@ -592,6 +592,9 @@ struct amsdu_subframe_hdr {
#define GROUP_ID_IS_SU_MIMO(x) ((x) == 0 || (x) == 63)
+static const u8 ath10k_bw_to_mac80211[] = { RATE_INFO_BW_20, RATE_INFO_BW_40,
+ RATE_INFO_BW_80, RATE_INFO_BW_160 };
+
static void ath10k_htt_rx_h_rates(struct ath10k *ar,
struct ieee80211_rx_status *status,
struct htt_rx_desc *rxd)
@@ -694,23 +697,7 @@ static void ath10k_htt_rx_h_rates(struct ath10k *ar,
if (sgi)
status->enc_flags |= RX_ENC_FLAG_SHORT_GI;
[...]
+ status->bw = ath10k_bw_to_mac80211[bw];
status->encoding = RX_ENC_VHT;
break;
default:
@@ -2297,7 +2284,7 @@ ath10k_update_per_peer_tx_stats(struct ath10k *ar,
arsta->txrate.flags |= RATE_INFO_FLAGS_SHORT_GI;
arsta->txrate.nss = txrate.nss;
- arsta->txrate.bw = txrate.bw + RATE_INFO_BW_20;
+ arsta->txrate.bw = ath10k_bw_to_mac80211[txrate.bw];
}
static void ath10k_htt_fetch_peer_stats(struct ath10k *ar,
--
Mit freundlichen Grüssen / Regards
Sebastian Gottschall / CTO
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