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nl80211: Fix possible Spectre-v1 for NL80211_TXRATE_HT

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[ Upstream commit 30fe6d50eb ]

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

Signed-off-by: Masashi Honma <masashi.honma@gmail.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Masashi Honma
2018-09-25 11:15:00 +09:00
committed by Chris
parent c4e5aad4af
commit 0967b81427
1 changed files with 1 additions and 0 deletions
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net/wireless/nl80211.c
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@@ -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