From: Colin Ian King <colin.king@canonical.com>
Date: Thu, 22 Aug 2019 13:20:34 +0100
Subject: [PATCH] mac80211: minstrel_ht: fix infinite loop because supported is
 not being shifted

Currently the for-loop will spin forever if variable supported is
non-zero because supported is never changed.  Fix this by adding in
the missing right shift of supported.

Addresses-Coverity: ("Infinite loop")
Fixes: 48cb39522a9d ("mac80211: minstrel_ht: improve rate probing for devices with static fallback")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
---

--- a/net/mac80211/rc80211_minstrel_ht.c
+++ b/net/mac80211/rc80211_minstrel_ht.c
@@ -634,7 +634,7 @@ minstrel_ht_rate_sample_switch(struct mi
 		u16 supported = mi->supported[g_idx];
 
 		supported >>= mi->max_tp_rate[0] % MCS_GROUP_RATES;
-		for (i = 0; supported; i++) {
+		for (i = 0; supported; supported >>= 1, i++) {
 			if (!(supported & 1))
 				continue;