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| author | Sven Eckelmann <sven@narfation.org> | 2018-08-31 17:46:47 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-10-20 10:51:30 +0300 |
| commit | 92017857d65625fec7a816127eee65e766a6ee5a (patch) | |
| tree | 2b6cac8f364e869c3707bd2c9bf69d56b8f5223a /net/batman-adv | |
| parent | 7c9a83360f1cb89de7a7f801685edfd351eea07e (diff) | |
| download | linux-92017857d65625fec7a816127eee65e766a6ee5a.tar.xz | |
batman-adv: Fix segfault when writing to throughput_override
[ Upstream commit b9fd14c20871e6189f635e49b32d7789e430b3c8 ]
The per hardif sysfs file "batman_adv/throughput_override" prints the
resulting change as info text when the users writes to this file. It uses
the helper function batadv_info to add it at the same time to the kernel
ring buffer and to the batman-adv debug log (when CONFIG_BATMAN_ADV_DEBUG
is enabled).
The function batadv_info requires as first parameter the batman-adv softif
net_device. This parameter is then used to find the private buffer which
contains the debug log for this batman-adv interface. But
batadv_store_throughput_override used as first argument the slave
net_device. This slave device doesn't have the batadv_priv private data
which is access by batadv_info.
Writing to this file with CONFIG_BATMAN_ADV_DEBUG enabled can either lead
to a segfault or to memory corruption.
Fixes: 0b5ecc6811bd ("batman-adv: add throughput override attribute to hard_ifaces")
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Acked-by: Marek Lindner <mareklindner@neomailbox.ch>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net/batman-adv')
| -rw-r--r-- | net/batman-adv/sysfs.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/net/batman-adv/sysfs.c b/net/batman-adv/sysfs.c index 02d96f224c60..a3b5b76dc9de 100644 --- a/net/batman-adv/sysfs.c +++ b/net/batman-adv/sysfs.c @@ -1084,8 +1084,9 @@ static ssize_t batadv_store_throughput_override(struct kobject *kobj, if (old_tp_override == tp_override) goto out; - batadv_info(net_dev, "%s: Changing from: %u.%u MBit to: %u.%u MBit\n", - "throughput_override", + batadv_info(hard_iface->soft_iface, + "%s: %s: Changing from: %u.%u MBit to: %u.%u MBit\n", + "throughput_override", net_dev->name, old_tp_override / 10, old_tp_override % 10, tp_override / 10, tp_override % 10); |