From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001

From: Javier Martinez Canillas <javierm@redhat.com>

Date: Mon, 9 Mar 2020 15:30:05 +0100

Subject: [PATCH] efi/ip4_config: Improve check to detect literal IPv6

 addresses

The grub_efi_string_to_ip4_address() function wrongly assumes that an IPv6

address is an IPv4 address, because it doesn't take into account the case

of a caller passing an IPv6 address as a string.

This leads to the grub_efi_net_parse_address() function to fail and print

the following error message:

error: net/efi/net.c:785:unrecognised network address '2000:dead:beef:a::1'

Resolves: rhbz#1811560

Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>

---

 grub-core/net/efi/ip4_config.c | 13 ++++++++++++-

 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/grub-core/net/efi/ip4_config.c b/grub-core/net/efi/ip4_config.c

index 38e2a0474..6117e60ab 100644

--- a/grub-core/net/efi/ip4_config.c

+++ b/grub-core/net/efi/ip4_config.c

@@ -56,9 +56,20 @@ int

 grub_efi_string_to_ip4_address (const char *val, grub_efi_ipv4_address_t *address, const char **rest)

 {

   grub_uint32_t newip = 0;

-  int i;

+  int i, ncolon = 0;

   const char *ptr = val;

+  /* Check that is not an IPv6 address */

+  for (i = 0; i < grub_strlen(ptr); i++)

+    {

+      if (ptr[i] == '[' && i == 0)

+        return 0;

+

+      if (ptr[i] == ':')

+          if (i == 0 || ++ncolon == 2)

+            return 0;

+    }

+

   for (i = 0; i < 4; i++)

     {

       unsigned long t;