USB: usbtest: prevent a divide by zero bug

If param->length is zero, then this could lead to a divide by zero bug later in the function when we do: size %= max; Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
git-mirror · Nov 21, 2012 · 564e698 · 564e698
1 parent fb4e98a
commit 564e698
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/drivers/usb/misc/usbtest.c b/drivers/usb/misc/usbtest.c
@@ -423,6 +423,9 @@ alloc_sglist(int nents, int max, int vary)
 	unsigned		i;
 	unsigned		size = max;
 
+	if (max == 0)
+		return NULL;
+
 	sg = kmalloc_array(nents, sizeof *sg, GFP_KERNEL);
 	if (!sg)
 		return NULL;