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authorFelix Fietkau <nbd@openwrt.org>2015-07-31 19:49:17 +0000
committerFelix Fietkau <nbd@openwrt.org>2015-07-31 19:49:17 +0000
commitad5cd9ec1df33c9b700c904f99dfc5b30b481ab0 (patch)
tree474ce8658c5c2a8eecd9e154f7f4f4375599b581 /package/kernel/mac80211
parent38646926a2c5b872ca9da1105a0f13d341d08901 (diff)
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mac80211: fix an invalid read in minstrel rate sorting
Signed-off-by: Felix Fietkau <nbd@openwrt.org> SVN-Revision: 46533
Diffstat (limited to 'package/kernel/mac80211')
-rw-r--r--package/kernel/mac80211/patches/310-mac80211-fix-invalid-read-in-minstrel_sort_best_tp_r.patch34
1 files changed, 34 insertions, 0 deletions
diff --git a/package/kernel/mac80211/patches/310-mac80211-fix-invalid-read-in-minstrel_sort_best_tp_r.patch b/package/kernel/mac80211/patches/310-mac80211-fix-invalid-read-in-minstrel_sort_best_tp_r.patch
new file mode 100644
index 0000000000..51a315c204
--- /dev/null
+++ b/package/kernel/mac80211/patches/310-mac80211-fix-invalid-read-in-minstrel_sort_best_tp_r.patch
@@ -0,0 +1,34 @@
+From: Adrien Schildknecht <adrien+dev@schischi.me>
+Date: Tue, 28 Jul 2015 10:30:16 +0200
+Subject: [PATCH] mac80211: fix invalid read in minstrel_sort_best_tp_rates()
+
+At the last iteration of the loop, j may equal zero and thus
+tp_list[j - 1] causes an invalid read.
+Changed the logic of the loop so that j - 1 is always >= 0.
+
+Signed-off-by: Adrien Schildknecht <adrien+dev@schischi.me>
+---
+
+--- a/net/mac80211/rc80211_minstrel.c
++++ b/net/mac80211/rc80211_minstrel.c
+@@ -92,14 +92,15 @@ int minstrel_get_tp_avg(struct minstrel_
+ static inline void
+ minstrel_sort_best_tp_rates(struct minstrel_sta_info *mi, int i, u8 *tp_list)
+ {
+- int j = MAX_THR_RATES;
+- struct minstrel_rate_stats *tmp_mrs = &mi->r[j - 1].stats;
++ int j;
++ struct minstrel_rate_stats *tmp_mrs;
+ struct minstrel_rate_stats *cur_mrs = &mi->r[i].stats;
+
+- while (j > 0 && (minstrel_get_tp_avg(&mi->r[i], cur_mrs->prob_ewma) >
+- minstrel_get_tp_avg(&mi->r[tp_list[j - 1]], tmp_mrs->prob_ewma))) {
+- j--;
++ for (j = MAX_THR_RATES; j > 0; --j) {
+ tmp_mrs = &mi->r[tp_list[j - 1]].stats;
++ if (minstrel_get_tp_avg(&mi->r[i], cur_mrs->prob_ewma) <=
++ minstrel_get_tp_avg(&mi->r[tp_list[j - 1]], tmp_mrs->prob_ewma))
++ break;
+ }
+
+ if (j < MAX_THR_RATES - 1)