Detected by UB Sanitizer when running system tests:
lib/netdev-linux.c:6250:26: runtime error: member access within misaligned
address 0x00000229a204 for type 'const struct rpl_rtnl_link_stats64', which
requires 8 byte alignment
0x00000229a204: note: pointer points here
c4 00 17 00 01 00 00 00 00 00 00 00 01 00 00 00 00 00 00 00 6e 00 00 00
00 00 00 00 6e 00 00 00
^
#0 0x89f10e in netdev_stats_from_rtnl_link_stats64 lib/netdev-linux.c:6250
#1 0x89f10e in get_stats_via_netlink lib/netdev-linux.c:6298
#2 0x8a039a in netdev_linux_get_stats lib/netdev-linux.c:2227
#3 0x68e149 in netdev_get_stats lib/netdev.c:1599
#4 0x407b21 in iface_refresh_stats vswitchd/bridge.c:2687
#5 0x419eb6 in iface_create vswitchd/bridge.c:2134
#6 0x419eb6 in bridge_add_ports__ vswitchd/bridge.c:1170
#7 0x41f71c in bridge_add_ports vswitchd/bridge.c:1181
#8 0x41f71c in bridge_reconfigure vswitchd/bridge.c:898
#9 0x429f59 in bridge_run vswitchd/bridge.c:3331
#10 0x430af3 in main vswitchd/ovs-vswitchd.c:129
#11 0x7fbdfd43eb74 in __libc_start_main (/lib64/libc.so.6+0x27b74)
#12 0x4072fd in _start (/root/ovs/vswitchd/ovs-vswitchd+0x4072fd)
Signed-off-by: Dumitru Ceara <dce...@redhat.com>
---
include/openvswitch/util.h | 3 +++
lib/netdev-linux.c | 9 ++++++++-
2 files changed, 11 insertions(+), 1 deletion(-)
diff --git a/include/openvswitch/util.h b/include/openvswitch/util.h
index 96f600160b23..8e6c46a85f13 100644
--- a/include/openvswitch/util.h
+++ b/include/openvswitch/util.h
@@ -429,6 +429,9 @@ is_pow2(uintmax_t x)
* segfault, so it is important to be aware of correct alignment. */
#define ALIGNED_CAST(TYPE, ATTR) ((TYPE) (void *) (ATTR))
+#define IS_PTR_ALIGNED(OBJ) \
+ (!(OBJ) || (uintptr_t) (OBJ) % __alignof__(OVS_TYPEOF(OBJ)) == 0)
+
#ifdef __cplusplus
}
#endif
diff --git a/lib/netdev-linux.c b/lib/netdev-linux.c
index 9d125029de01..2766b3f2bf67 100644
--- a/lib/netdev-linux.c
+++ b/lib/netdev-linux.c
@@ -6295,7 +6295,14 @@ get_stats_via_netlink(const struct netdev *netdev_,
struct netdev_stats *stats)
if (ofpbuf_try_pull(reply, NLMSG_HDRLEN + sizeof(struct ifinfomsg))) {
const struct nlattr *a = nl_attr_find(reply, 0, IFLA_STATS64);
if (a && nl_attr_get_size(a) >= sizeof(struct rtnl_link_stats64)) {
- netdev_stats_from_rtnl_link_stats64(stats, nl_attr_get(a));
+ const struct rtnl_link_stats64 *lstats = nl_attr_get(a);
+ struct rtnl_link_stats64 aligned_lstats;
+
+ if (!IS_PTR_ALIGNED(lstats)) {
+ memcpy(&aligned_lstats, lstats, sizeof aligned_lstats);
+ lstats = &aligned_lstats;
+ }
+ netdev_stats_from_rtnl_link_stats64(stats, lstats);
error = 0;
} else {
a = nl_attr_find(reply, 0, IFLA_STATS);
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