net/bootp: Fix unchecked return value

In the function send_dhcp_packet(), added an error check for the return
value of grub_netbuff_push().

Fixes: CID 404614
Signed-off-by: Alec Brown <alec.r.brown@oracle.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>

diff --git a/grub-core/net/bootp.c b/grub-core/net/bootp.c
index 7d31dba970a8ec834e115e2e791a1d7197a8ad2e..abe45ef7bf653259412b7da83f3675af70ecd123 100644 (file)
--- a/grub-core/net/bootp.c
+++ b/grub-core/net/bootp.c
@@ -583,7 +583,9 @@ send_dhcp_packet (struct grub_net_network_level_interface *iface)
 
   grub_memcpy (&pack->mac_addr, &iface->hwaddress.mac, 6);
 
-  grub_netbuff_push (nb, sizeof (*udph));
+  err = grub_netbuff_push (nb, sizeof (*udph));
+  if (err)
+    goto out;
 
   udph = (struct udphdr *) nb->data;
   udph->src = grub_cpu_to_be16_compile_time (68);