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authorDan Rosenberg <drosenberg@vsecurity.com>2010-09-15 07:43:04 -0400
committerDavid S. Miller <davem@davemloft.net>2010-09-17 00:54:59 -0400
commit44467187dc22fdd33a1a06ea0ba86ce20be3fe3c (patch)
tree5a05b2802aebe542ae5caeafd72161b4e9a3d726
parent7011e660938fc44ed86319c18a5954e95a82ab3e (diff)
drivers/net/eql.c: prevent reading uninitialized stack memory
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 <dan.j.rosenberg@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--drivers/net/eql.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/net/eql.c b/drivers/net/eql.c
index dda2c7944da9..0cb1cf9cf4b0 100644
--- a/drivers/net/eql.c
+++ b/drivers/net/eql.c
@@ -555,6 +555,8 @@ static int eql_g_master_cfg(struct net_device *dev, master_config_t __user *mcp)
555 equalizer_t *eql; 555 equalizer_t *eql;
556 master_config_t mc; 556 master_config_t mc;
557 557
558 memset(&mc, 0, sizeof(master_config_t));
559
558 if (eql_is_master(dev)) { 560 if (eql_is_master(dev)) {
559 eql = netdev_priv(dev); 561 eql = netdev_priv(dev);
560 mc.max_slaves = eql->max_slaves; 562 mc.max_slaves = eql->max_slaves;