Blame SOURCES/0210-Coverity-rightly-noticed-that-grub_ipv6_get_masksize.patch

27a4da
From d9431a66b312084644186f16ba9ca2f9f21b64dd Mon Sep 17 00:00:00 2001
23d2ea
From: Peter Jones <pjones@redhat.com>
23d2ea
Date: Tue, 12 Jul 2016 11:59:39 -0400
27a4da
Subject: [PATCH 210/260] Coverity rightly noticed that
23d2ea
 grub_ipv6_get_masksize() was broken.
23d2ea
23d2ea
This fixes it with a version that even seems to work.
23d2ea
23d2ea
Related: rhbz#1154226
23d2ea
23d2ea
Signed-off-by: Peter Jones <pjones@redhat.com>
23d2ea
---
23d2ea
 grub-core/net/net.c | 27 ++++++++++++++++-----------
23d2ea
 include/grub/net.h  |  2 +-
23d2ea
 2 files changed, 17 insertions(+), 12 deletions(-)
23d2ea
23d2ea
diff --git a/grub-core/net/net.c b/grub-core/net/net.c
27a4da
index 19a81bc9e..36fc0d8b2 100644
23d2ea
--- a/grub-core/net/net.c
23d2ea
+++ b/grub-core/net/net.c
23d2ea
@@ -970,29 +970,34 @@ grub_net_network_level_interface_register (struct grub_net_network_level_interfa
23d2ea
 }
23d2ea
 
23d2ea
 int
23d2ea
-grub_ipv6_get_masksize(grub_uint8_t *be_mask)
23d2ea
+grub_ipv6_get_masksize (grub_uint16_t be_mask[8])
23d2ea
 {
23d2ea
   grub_uint8_t *mask;
23d2ea
   grub_uint16_t mask16[8];
23d2ea
-  unsigned int x;
23d2ea
-  int ret = 0;
23d2ea
+  int x, y;
23d2ea
+  int ret = 128;
23d2ea
 
23d2ea
-  grub_memcpy (mask16, be_mask, sizeof(mask16));
23d2ea
+  grub_memcpy (mask16, be_mask, sizeof (mask16));
23d2ea
   for (x = 0; x < 8; x++)
23d2ea
     mask16[x] = grub_be_to_cpu16 (mask16[x]);
23d2ea
 
23d2ea
   mask = (grub_uint8_t *)mask16;
23d2ea
 
23d2ea
-  for (x = 15; x > 0; x--)
23d2ea
+  for (x = 15; x >= 0; x--)
23d2ea
     {
23d2ea
       grub_uint8_t octet = mask[x];
23d2ea
-      while (octet & 0x80)
23d2ea
+      if (!octet)
23d2ea
 	{
23d2ea
-	  ret++;
23d2ea
-	  octet <<= 1;
23d2ea
+	  ret -= 8;
23d2ea
+	  continue;
23d2ea
+	}
23d2ea
+      for (y = 0; y < 8; y++)
23d2ea
+	{
23d2ea
+	  if (octet & (1 << y))
23d2ea
+	    break;
23d2ea
+	  else
23d2ea
+	    ret--;
23d2ea
 	}
23d2ea
-      if (ret)
23d2ea
-	ret += 8 * (15 - x);
23d2ea
       break;
23d2ea
     }
23d2ea
 
23d2ea
@@ -1009,7 +1014,7 @@ grub_net_add_ipv6_local (struct grub_net_network_level_interface *inter,
23d2ea
     return 0;
23d2ea
 
23d2ea
   if (mask == -1)
23d2ea
-      mask = grub_ipv6_get_masksize ((grub_uint8_t *)inter->address.ipv6);
23d2ea
+      mask = grub_ipv6_get_masksize ((grub_uint16_t *)inter->address.ipv6);
23d2ea
 
23d2ea
   if (mask == -1)
23d2ea
     return 0;
23d2ea
diff --git a/include/grub/net.h b/include/grub/net.h
27a4da
index c7b8e2ac8..bd930f4dd 100644
23d2ea
--- a/include/grub/net.h
23d2ea
+++ b/include/grub/net.h
23d2ea
@@ -500,7 +500,7 @@ grub_net_configure_by_dhcpv6_ack (const char *name,
23d2ea
 				 int is_def, char **device, char **path);
23d2ea
 
23d2ea
 int
23d2ea
-grub_ipv6_get_masksize(grub_uint8_t *mask);
23d2ea
+grub_ipv6_get_masksize(grub_uint16_t *mask);
23d2ea
 
23d2ea
 grub_err_t
23d2ea
 grub_net_add_ipv6_local (struct grub_net_network_level_interface *inf,
23d2ea
-- 
27a4da
2.13.0
23d2ea