diff mbox series

[4.9,56/90] batman-adv: Accept only filled wifi station info

Message ID 20200319123945.669377960@linuxfoundation.org
State New
Headers show
Series None | expand

Commit Message

Greg KH March 19, 2020, 1 p.m. UTC 
From: Sven Eckelmann <sven@narfation.org>

commit d62890885efbc48acea46964ea3af69b61c8c5eb 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: c833484e5f38 ("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>
---
 net/batman-adv/bat_v_elp.c |    4 ++++
 1 file changed, 4 insertions(+)
diff mbox series

Patch

--- a/net/batman-adv/bat_v_elp.c
+++ b/net/batman-adv/bat_v_elp.c
@@ -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(s
 			}
 			if (ret)
 				goto default_throughput;
+			if (!(sinfo.filled & BIT(NL80211_STA_INFO_EXPECTED_THROUGHPUT)))
+				goto default_throughput;
 
 			return sinfo.expected_throughput / 100;
 		}