drivers/net/cxgb3/cxgb3_main.c: prevent reading uninitialized stack memory

Fixed formatting (tabs and line breaks).

The CHELSIO_GET_QSET_NUM device ioctl allows unprivileged users to read
4 bytes of uninitialized stack memory, because the "addr" member of the
ch_reg struct declared on the stack in cxgb_extension_ioctl() 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>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/net/cxgb3/cxgb3_main.c b/drivers/net/cxgb3/cxgb3_main.c
index ad19585d960b..f208712c0b90 100644
--- a/drivers/net/cxgb3/cxgb3_main.c
+++ b/drivers/net/cxgb3/cxgb3_main.c
@@ -2296,6 +2296,8 @@ static int cxgb_extension_ioctl(struct net_device *dev, void __user *useraddr)
         case CHELSIO_GET_QSET_NUM:{
                 struct ch_reg edata;
 
+                memset(&edata, 0, sizeof(struct ch_reg));
+
                 edata.cmd = CHELSIO_GET_QSET_NUM;
                 edata.val = pi->nqsets;
                 if (copy_to_user(useraddr, &edata, sizeof(edata)))