[PATCH] dnsmasq 276test8: last patch from upstream (005)

[Matthias Fischer <matthias.fischer@ipfire.org>]

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Fixes floating point exeption (IPv6 only).

Signed-off-by: Matthias Fischer <matthias.fischer(a)ipfire.org>
---
 lfs/dnsmasq                                        |  1 +
 ...-zero_when_dhcp-range_is_a_whole_slash_64.patch | 59 ++++++++++++++++++++++
 2 files changed, 60 insertions(+)
 create mode 100644 src/patches/dnsmasq/005-Avoid_divide-by-zero_when_dhcp-range_is_a_whole_slash_64.patch

diff --git a/lfs/dnsmasq b/lfs/dnsmasq
index 67e6a61..6417a75 100644
--- a/lfs/dnsmasq
+++ b/lfs/dnsmasq
@@ -77,6 +77,7 @@ $(TARGET) : $(patsubst %,$(DIR_DL)/%,$(objects))
 	cd $(DIR_APP) && patch -Np1 -i $(DIR_SRC)/src/patches/dnsmasq/002-Make_names_of_ARP_script_actions_consistent.patch
 	cd $(DIR_APP) && patch -Np1 -i $(DIR_SRC)/src/patches/dnsmasq/003-Fix_breakage_in_ARP_code_when_IPV6_support_not_compiled_in.patch
 	cd $(DIR_APP) && patch -Np1 -i $(DIR_SRC)/src/patches/dnsmasq/004-Avoid_losing_timer_when_deleting_a_RA_context.patch
+	cd $(DIR_APP) && patch -Np1 -i $(DIR_SRC)/src/patches/dnsmasq/005-Avoid_divide-by-zero_when_dhcp-range_is_a_whole_slash_64.patch
 	cd $(DIR_APP) && patch -Np1 -i $(DIR_SRC)/src/patches/dnsmasq-Add-support-to-read-ISC-DHCP-lease-file.patch
 
 	cd $(DIR_APP) && sed -i src/config.h \
diff --git a/src/patches/dnsmasq/005-Avoid_divide-by-zero_when_dhcp-range_is_a_whole_slash_64.patch b/src/patches/dnsmasq/005-Avoid_divide-by-zero_when_dhcp-range_is_a_whole_slash_64.patch
new file mode 100644
index 0000000..acf1180
--- /dev/null
+++ b/src/patches/dnsmasq/005-Avoid_divide-by-zero_when_dhcp-range_is_a_whole_slash_64.patch
@@ -0,0 +1,59 @@
+From fdc97e13836ba83a6091b7eac79ba8ec40f1ddb9 Mon Sep 17 00:00:00 2001
+From: Simon Kelley <simon(a)thekelleys.org.uk>
+Date: Sat, 13 Feb 2016 17:47:17 +0000
+Subject: [PATCH] Avoid divide-by-zero when dhcp-range is a whole /64
+
+---
+ CHANGELOG   |   11 +++++++----
+ src/dhcp6.c |   11 ++++++++++-
+ 2 files changed, 17 insertions(+), 5 deletions(-)
+
+diff --git a/CHANGELOG b/CHANGELOG
+index 5feb47c..14354f2 100644
+--- a/CHANGELOG
++++ b/CHANGELOG
+@@ -40,12 +40,15 @@ version 2.76
+ 
+ 	    Extend --add-mac to allow a new encoding of the MAC address 
+ 	    as base64, by configurting --add-mac=base64
+-
++ 
+ 	    Add --add-cpe-id option.
+ 
+-	
+-	    
+-	
++            Don't crash with divide-by-zero if an IPv6 dhcp-range
++	    is declared as a whole /64.
++	    (ie xx::0 to xx::ffff:ffff:ffff:ffff) 
++	    Thanks to Laurent Bendel for spotting this problem.
++
++
+ version 2.75
+             Fix reversion on 2.74 which caused 100% CPU use when a 
+ 	    dhcp-script is configured. Thanks to Adrian Davey for
+diff --git a/src/dhcp6.c b/src/dhcp6.c
+index 7269fd2..93a359e 100644
+--- a/src/dhcp6.c
++++ b/src/dhcp6.c
+@@ -434,7 +434,16 @@ struct dhcp_context *address6_allocate(struct dhcp_context *context,  unsigned c
+ 	    /* seed is largest extant lease addr in this context */
+ 	    start = lease_find_max_addr6(c) + serial;
+ 	  else
+-	    start = addr6part(&c->start6) + ((j + c->addr_epoch) % (1 + addr6part(&c->end6) - addr6part(&c->start6)));
++	    {
++	      u64 range = 1 + addr6part(&c->end6) - addr6part(&c->start6);
++	      u64 offset = j + c->addr_epoch;
++
++	      /* don't divide by zero if range is whole 2^64 */
++	      if (range != 0)
++		offset = offset % range;
++
++	      start = addr6part(&c->start6) + offset;
++	    }
+ 
+ 	  /* iterate until we find a free address. */
+ 	  addr = start;
+-- 
+1.7.10.4
+
-- 
2.7.1