[16/44] usb: misc: sisusbvga: fix information leak to userland

[Greg KH]

2.6.27-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Vasiliy Kulikov <segooon@xxxxxxxxx>

commit 5dc92cf1d0b4b0debbd2e333b83f9746c103533d upstream.

Structure sisusb_info is copied to userland with "sisusb_reserved" field
uninitialized.  It leads to leaking of contents of kernel stack memory.

Signed-off-by: Vasiliy Kulikov <segooon@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
 drivers/usb/misc/sisusbvga/sisusb.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/usb/misc/sisusbvga/sisusb.c
+++ b/drivers/usb/misc/sisusbvga/sisusb.c
@@ -3031,6 +3031,7 @@ sisusb_ioctl(struct file *file, unsigned
 #else
 			x.sisusb_conactive  = 0;
 #endif
+			memset(x.sisusb_reserved, 0, sizeof(x.sisusb_reserved));
 
 			if (copy_to_user((void __user *)arg, &x, sizeof(x)))
 				retval = -EFAULT;


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