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batman-adv: Accept only filled wifi station info

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commit d62890885e upstream.

The wifi driver can decide to not provide parts of the station info. For
example, the expected throughput of the station can be omitted when the
used rate control doesn't provide this kind of information.

The B.A.T.M.A.N. V implementation must therefore check the filled bitfield
before it tries to access the expected_throughput of the returned
station_info.

Reported-by: Alvaro Antelo <alvaro.antelo@gmail.com>
Fixes: c833484e5f ("batman-adv: ELP - compute the metric based on the estimated throughput")
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Reviewed-by: Marek Lindner <mareklindner@neomailbox.ch>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Sven Eckelmann
2020-03-16 23:30:47 +01:00
committed by Greg Kroah-Hartman
parent 1c5a456ac6
commit f357813e20
1 changed files with 4 additions and 0 deletions
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4
net/batman-adv/bat_v_elp.c
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@@ -19,6 +19,7 @@
#include "main.h"
#include <linux/atomic.h>
#include <linux/bitops.h>
#include <linux/byteorder/generic.h>
#include <linux/errno.h>
#include <linux/etherdevice.h>
@@ -29,6 +30,7 @@
#include <linux/kernel.h>
#include <linux/kref.h>
#include <linux/netdevice.h>
#include <linux/nl80211.h>
#include <linux/random.h>
#include <linux/rculist.h>
#include <linux/rcupdate.h>
@@ -102,6 +104,8 @@ static u32 batadv_v_elp_get_throughput(struct batadv_hardif_neigh_node *neigh)
}
if (ret)
goto default_throughput;
if (!(sinfo.filled & BIT(NL80211_STA_INFO_EXPECTED_THROUGHPUT)))
goto default_throughput;
return sinfo.expected_throughput / 100;
}