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author | Felix Fietkau <nbd@openwrt.org> | 2015-07-31 19:49:17 +0000 |
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committer | Felix Fietkau <nbd@openwrt.org> | 2015-07-31 19:49:17 +0000 |
commit | ad5cd9ec1df33c9b700c904f99dfc5b30b481ab0 (patch) | |
tree | 474ce8658c5c2a8eecd9e154f7f4f4375599b581 | |
parent | 38646926a2c5b872ca9da1105a0f13d341d08901 (diff) | |
download | master-31e0f0ae-ad5cd9ec1df33c9b700c904f99dfc5b30b481ab0.tar.gz master-31e0f0ae-ad5cd9ec1df33c9b700c904f99dfc5b30b481ab0.tar.bz2 master-31e0f0ae-ad5cd9ec1df33c9b700c904f99dfc5b30b481ab0.zip |
mac80211: fix an invalid read in minstrel rate sorting
Signed-off-by: Felix Fietkau <nbd@openwrt.org>
SVN-Revision: 46533
-rw-r--r-- | package/kernel/mac80211/patches/310-mac80211-fix-invalid-read-in-minstrel_sort_best_tp_r.patch | 34 |
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) |