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mac80211: fix a regression in the minstrel_ht improvement patches 

Signed-off-by: Felix Fietkau <nbd@nbd.name>
master
Felix Fietkau 2019-08-24 12:41:19 +02:00
parent 921675a2d1
commit f0992d7a30
1 changed files with 25 additions and 0 deletions
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package/kernel/mac80211/patches/subsys/315-mac80211-minstrel_ht-fix-infinite-loop-because-suppo.patch Normal file
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@ -0,0 +1,25 @@
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;