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