[PATCH 4.9 073/172] net: ethtool: Initialize buffer when querying device channel settings

From: Greg Kroah-Hartman
Date: Mon Jul 03 2017 - 09:43:31 EST

4.9-stable review patch. If anyone has any objections, please let me know.


From: Eran Ben Elisha <eranbe@xxxxxxxxxxxx>

[ Upstream commit 31a86d137219373c3222ca5f4f912e9a4d8065bb ]

Ethtool channels respond struct was uninitialized when querying device
channel boundaries settings. As a result, unreported fields by the driver
hold garbage. This may cause sending unsupported params to driver.

Fixes: 8bf368620486 ('ethtool: ensure channel counts are within bounds ...')
Signed-off-by: Eran Ben Elisha <eranbe@xxxxxxxxxxxx>
Signed-off-by: Tariq Toukan <tariqt@xxxxxxxxxxxx>
CC: John W. Linville <linville@xxxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
net/core/ethtool.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/net/core/ethtool.c
+++ b/net/core/ethtool.c
@@ -1704,7 +1704,7 @@ static noinline_for_stack int ethtool_ge
static noinline_for_stack int ethtool_set_channels(struct net_device *dev,
void __user *useraddr)
- struct ethtool_channels channels, max;
+ struct ethtool_channels channels, max = { .cmd = ETHTOOL_GCHANNELS };
u32 max_rx_in_use = 0;

if (!dev->ethtool_ops->set_channels || !dev->ethtool_ops->get_channels)