[PATCH 26/29] device/net_io.c (net_getstat): check if addr_byte_count is negative

[Marin Ramesa]

Check if addr_byte_count is negative. If it is negative the call to
memcpy() will fail. In that case return KERN_INVALID_ARGUMENT.

* device/net_io.c (net_getstat): Check if addr_byte_count is negative.

---
 device/net_io.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/device/net_io.c b/device/net_io.c
index b3ec292..f437340 100644
--- a/device/net_io.c
+++ b/device/net_io.c
@@ -1404,7 +1404,8 @@ net_getstat(ifp, flavor, status, count)
                int     addr_int_count;
                int     i;
 
-               addr_byte_count = ifp->if_address_size;
+               if ((addr_byte_count = ifp->if_address_size) < 0)
+                       return KERN_INVALID_ARGUMENT;
                addr_int_count = (addr_byte_count + (sizeof(int)-1))
                                         / sizeof(int);
 
-- 
1.8.1.4