linux-kernel - [PATCH AUTOSEL 4.9 15/38] nl80211: Fix possible Spectre-v1 for NL80211_TXRATE

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Message-Id: <20181016041522.135789-15-sashal@kernel.org>
Date:   Tue, 16 Oct 2018 00:14:59 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     stable@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Masashi Honma <masashi.honma@...il.com>,
        Johannes Berg <johannes.berg@...el.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH AUTOSEL 4.9 15/38] nl80211: Fix possible Spectre-v1 for NL80211_TXRATE_HT

From: Masashi Honma <masashi.honma@...il.com>

[ Upstream commit 30fe6d50eb088783c8729c7d930f65296b2b3fa7 ]

Use array_index_nospec() to sanitize ridx with respect to speculation.

Signed-off-by: Masashi Honma <masashi.honma@...il.com>
Signed-off-by: Johannes Berg <johannes.berg@...el.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 net/wireless/nl80211.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 0e91ec49d3da..549d0a4083b3 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -3422,6 +3422,7 @@ static bool ht_rateset_to_mask(struct ieee80211_supported_band *sband,
 			return false;
 
 		/* check availability */
+		ridx = array_index_nospec(ridx, IEEE80211_HT_MCS_MASK_LEN);
 		if (sband->ht_cap.mcs.rx_mask[ridx] & rbit)
 			mcs[ridx] |= rbit;
 		else
-- 
2.17.1