From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001 From: Javier Martinez Canillas 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 --- 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;