From ab5fc422d50d6e43faed1d757be1deb2ba2200e0 Mon Sep 17 00:00:00 2001 From: Dan Rosenberg Date: Wed, 15 Sep 2010 11:43:04 +0000 Subject: [PATCH] drivers/net/eql.c: prevent reading uninitialized stack memory commit 44467187dc22fdd33a1a06ea0ba86ce20be3fe3c upstream. Fixed formatting (tabs and line breaks). The EQL_GETMASTRCFG device ioctl allows unprivileged users to read 16 bytes of uninitialized stack memory, because the "master_name" member of the master_config_t struct declared on the stack in eql_g_master_cfg() is not altered or zeroed before being copied back to the user. This patch takes care of it. Signed-off-by: Dan Rosenberg Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- drivers/net/eql.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/net/eql.c b/drivers/net/eql.c index f5b96cadeb25..fd57fb421e91 100644 --- a/drivers/net/eql.c +++ b/drivers/net/eql.c @@ -554,6 +554,8 @@ static int eql_g_master_cfg(struct net_device *dev, master_config_t __user *mcp) equalizer_t *eql; master_config_t mc; + memset(&mc, 0, sizeof(master_config_t)); + if (eql_is_master(dev)) { eql = netdev_priv(dev); mc.max_slaves = eql->max_slaves; -- 2.11.4.GIT