libnl: Fix random segfaults due to memory corruption

This is a backport from upstream fixes a severe problem
w.r.t memory management, where it would result in random
segfaults in applications depending on libnl

(From OE-Core rev: c3fb18aac0de49dc3113296699d95be298d98140)

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Robert Yang <liezhi.yang@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

2 files changed, 44 insertions, 1 deletions

diff --git a/meta/recipes-support/libnl/libnl/0001-fix-double-free-caused-by-freeing-link-af_data-in-rt.patch b/meta/recipes-support/libnl/libnl/0001-fix-double-free-caused-by-freeing-link-af_data-in-rt.patch
new file mode 100644
index 0000000000..6d2c8ff72d
--- /dev/null
+++ b/meta/recipes-support/libnl/libnl/0001-fix-double-free-caused-by-freeing-link-af_data-in-rt.patch
@@ -0,0 +1,41 @@
+From 6f37b439af7e96104aadd8ec3ae8d3882df8d102 Mon Sep 17 00:00:00 2001
+From: Jiri Pirko <jiri@resnulli.us>
+Date: Wed, 21 Aug 2013 14:40:34 +0200
+Subject: [PATCH] fix double free caused by freeing link af_data in
+ rtnl_link_set_family()
+
+Introduced by commit 8026fe2e3a9089eff3f5a06ee6e3cc78d96334ed ("link:
+Free and realloc af specific data upon rtnl_link_set_family()")
+
+link->l_af_data[link->l_af_ops->ao_family] is freed here but not set to
+zero. That leads to double free made by link_free_data->do_foreach_af.
+
+Fix this by setting link->l_af_data[link->l_af_ops->ao_family] to zero
+rigth after free.
+
+Signed-off-by: Jiri Pirko <jiri@resnulli.us>
+Signed-off-by: Thomas Graf <tgraf@suug.ch>
+---
+ lib/route/link.c | 4 +++-
+ 1 file changed, 3 insertions(+), 1 deletion(-)
+
+diff --git a/lib/route/link.c b/lib/route/link.c
+index a73e1db..0bb90a0 100644
+--- a/lib/route/link.c
++++ b/lib/route/link.c
+@@ -1762,9 +1762,11 @@ void rtnl_link_set_family(struct rtnl_link *link, int family)
+        link->l_family = family;
+        link->ce_mask |= LINK_ATTR_FAMILY;
+ 
+-       if (link->l_af_ops)
++       if (link->l_af_ops) {
+                af_free(link, link->l_af_ops,
+                        link->l_af_data[link->l_af_ops->ao_family], NULL);
++               link->l_af_data[link->l_af_ops->ao_family] = NULL;
++       }
+ 
+        link->l_af_ops = af_lookup_and_alloc(link, family);
+ }
+-- 
+1.8.4
+
diff --git a/meta/recipes-support/libnl/libnl_3.2.22.bb b/meta/recipes-support/libnl/libnl_3.2.22.bb
index 30f85b2995..3c31b1ac86 100644
--- a/meta/recipes-support/libnl/libnl_3.2.22.bb
+++ b/meta/recipes-support/libnl/libnl_3.2.22.bb
@@ -12,7 +12,9 @@ DEPENDS = "flex-native bison-native"
 SRC_URI = "http://www.infradead.org/~tgr/${BPN}/files/${BP}.tar.gz \
            file://fix-pktloc_syntax_h-race.patch \
            file://fix-pc-file.patch \
-           file://fix-lib-cache_mngr.c-two-parentheses-bugs.patch"
+           file://fix-lib-cache_mngr.c-two-parentheses-bugs.patch \
+           file://0001-fix-double-free-caused-by-freeing-link-af_data-in-rt.patch \
+          "
 
 SRC_URI[md5sum] = "2e1c889494d274aca24ce5f6a748e66e"
 SRC_URI[sha256sum] = "c7c5f267dfeae0c1a530bf96b71fb7c8dbbb07d54beef49b6712d8d6166f629b"