diff options
| -rw-r--r-- | package/kernel/mac80211/patches/379-cfg80211-initialize-sinfo-in-cfg80211_get_station.patch | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/package/kernel/mac80211/patches/379-cfg80211-initialize-sinfo-in-cfg80211_get_station.patch b/package/kernel/mac80211/patches/379-cfg80211-initialize-sinfo-in-cfg80211_get_station.patch new file mode 100644 index 0000000000..37323c1f7d --- /dev/null +++ b/package/kernel/mac80211/patches/379-cfg80211-initialize-sinfo-in-cfg80211_get_station.patch @@ -0,0 +1,42 @@ +From 4f717a2589be649afddbbd3ac58b67ebfa7426f7 Mon Sep 17 00:00:00 2001 +From: Sven Eckelmann <sven@narfation.org> +Date: Wed, 6 Jun 2018 10:18:31 +0200 +Subject: [PATCH v2] cfg80211: initialize sinfo in cfg80211_get_station + +Most of the implementations behind cfg80211_get_station will not initialize +sinfo to zero before manipulating it. For example, the member "filled", +which indicates the filled in parts of this struct, is often only modified +by enabling certain bits in the bitfield while keeping the remaining bits +in their original state. A caller without a preinitialized sinfo.filled can +then no longer decide which parts of sinfo were filled in by +cfg80211_get_station (or actually the underlying implementations). + +cfg80211_get_station must therefore take care that sinfo is initialized to +zero. Otherwise, the caller may tries to read information which was not +filled in and which must therefore also be considered uninitialized. In +batadv_v_elp_get_throughput's case, an invalid "random" expected throughput +may be stored for this neighbor and thus the B.A.T.M.A.N V algorithm may +switch to non-optimal neighbors for certain destinations. + +Fixes: 7406353d43c8 ("cfg80211: implement cfg80211_get_station cfg80211 API") +Reported-by: Thomas Lauer <holminateur@gmail.com> +Reported-by: Marcel Schmidt <ff.z-casparistrasse@mailbox.org> +Cc: b.a.t.m.a.n@lists.open-mesh.org +Signed-off-by: Sven Eckelmann <sven@narfation.org> + +Forwarded: https://patchwork.kernel.org/patch/10449857/ +--- + net/wireless/util.c | 2 ++ + 1 file changed, 2 insertions(+) + +--- a/net/wireless/util.c ++++ b/net/wireless/util.c +@@ -1749,6 +1749,8 @@ int cfg80211_get_station(struct net_devi + if (!rdev->ops->get_station) + return -EOPNOTSUPP; + ++ memset(sinfo, 0, sizeof(*sinfo)); ++ + return rdev_get_station(rdev, dev, mac_addr, sinfo); + } + EXPORT_SYMBOL(cfg80211_get_station); |