[CVE 1/2] cciss: fix info leak in cciss_ioctl32_passthru()

[Luis Henriques]

From: Dan Carpenter <dan.carpenter at oracle.com>

BugLink: http://bugs.launchpad.net/bugs/1188355

CVE-2013-2147

The arg64 struct has a hole after ->buf_size which isn't cleared.  Or if
any of the calls to copy_from_user() fail then that would cause an
information leak as well.

This was assigned CVE-2013-2147.

Signed-off-by: Dan Carpenter <dan.carpenter at oracle.com>
Acked-by: Mike Miller <mike.miller at hp.com>
Signed-off-by: Andrew Morton <akpm at linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds at linux-foundation.org>
(cherry picked from commit 58f09e00ae095e46ef9edfcf3a5fd9ccdfad065e)
Signed-off-by: Luis Henriques <luis.henriques at canonical.com>
---
 drivers/block/cciss.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c
index 68b90d9..d4d165a 100644
--- a/drivers/block/cciss.c
+++ b/drivers/block/cciss.c
@@ -1011,6 +1011,7 @@ static int cciss_ioctl32_passthru(struct block_device *bdev, fmode_t mode,
 	int err;
 	u32 cp;
 
+	memset(&arg64, 0, sizeof(arg64));
 	err = 0;
 	err |=
 	    copy_from_user(&arg64.LUN_info, &arg32->LUN_info,
-- 
1.8.3.2