grub2/0148-efi-ip4_config-Improve-check-to-detect-literal-IPv6-.patch

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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#1732765
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 b711a5d9457..313c818b184 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;