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From d9431a66b312084644186f16ba9ca2f9f21b64dd Mon Sep 17 00:00:00 2001
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From: Peter Jones <pjones@redhat.com>
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Date: Tue, 12 Jul 2016 11:59:39 -0400
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Subject: [PATCH 210/261] Coverity rightly noticed that
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grub_ipv6_get_masksize() was broken.
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This fixes it with a version that even seems to work.
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Related: rhbz#1154226
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Signed-off-by: Peter Jones <pjones@redhat.com>
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---
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grub-core/net/net.c | 27 ++++++++++++++++-----------
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include/grub/net.h | 2 +-
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2 files changed, 17 insertions(+), 12 deletions(-)
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diff --git a/grub-core/net/net.c b/grub-core/net/net.c
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index 19a81bc9e..36fc0d8b2 100644
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--- a/grub-core/net/net.c
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+++ b/grub-core/net/net.c
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@@ -970,29 +970,34 @@ grub_net_network_level_interface_register (struct grub_net_network_level_interfa
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}
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int
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-grub_ipv6_get_masksize(grub_uint8_t *be_mask)
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+grub_ipv6_get_masksize (grub_uint16_t be_mask[8])
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{
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grub_uint8_t *mask;
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grub_uint16_t mask16[8];
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- unsigned int x;
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- int ret = 0;
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+ int x, y;
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+ int ret = 128;
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- grub_memcpy (mask16, be_mask, sizeof(mask16));
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+ grub_memcpy (mask16, be_mask, sizeof (mask16));
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for (x = 0; x < 8; x++)
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mask16[x] = grub_be_to_cpu16 (mask16[x]);
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mask = (grub_uint8_t *)mask16;
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- for (x = 15; x > 0; x--)
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+ for (x = 15; x >= 0; x--)
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{
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grub_uint8_t octet = mask[x];
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- while (octet & 0x80)
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+ if (!octet)
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{
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- ret++;
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- octet <<= 1;
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+ ret -= 8;
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+ continue;
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+ }
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+ for (y = 0; y < 8; y++)
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+ {
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+ if (octet & (1 << y))
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+ break;
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+ else
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+ ret--;
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}
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- if (ret)
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- ret += 8 * (15 - x);
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break;
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}
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@@ -1009,7 +1014,7 @@ grub_net_add_ipv6_local (struct grub_net_network_level_interface *inter,
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return 0;
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if (mask == -1)
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- mask = grub_ipv6_get_masksize ((grub_uint8_t *)inter->address.ipv6);
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+ mask = grub_ipv6_get_masksize ((grub_uint16_t *)inter->address.ipv6);
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if (mask == -1)
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return 0;
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diff --git a/include/grub/net.h b/include/grub/net.h
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index c7b8e2ac8..bd930f4dd 100644
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--- a/include/grub/net.h
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+++ b/include/grub/net.h
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@@ -500,7 +500,7 @@ grub_net_configure_by_dhcpv6_ack (const char *name,
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int is_def, char **device, char **path);
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int
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-grub_ipv6_get_masksize(grub_uint8_t *mask);
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+grub_ipv6_get_masksize(grub_uint16_t *mask);
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grub_err_t
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grub_net_add_ipv6_local (struct grub_net_network_level_interface *inf,
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--
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2.13.5
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