block: cciss: fix information leak to userland

Structure IOCTL_Command_struct is copied to userland with some padding fields at the end of the struct unitialized. It leads to leaking of contents of kernel stack memory.

---
Compile tested.

 drivers/block/cciss.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

index f09e6df..13d87a0 100644
@@ -1184,6 +1184,7 @@ static int cciss_ioctl32_big_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,

1.7.0.4

Thanks, applied.

Jens Axboe