kernel: gen_stats: Fix netlink stats dumping in the presence of padding

Backport hot off the press upstream netlink patch.  Fixes stats display
from CAKE qdisc on MIPS allowing us to bump CAKE to latest version.

The gen_stats facility will add a header for the toplevel nlattr of type
TCA_STATS2 that contains all stats added by qdisc callbacks. A reference
to this header is stored in the gnet_dump struct, and when all the
per-qdisc callbacks have finished adding their stats, the length of the
containing header will be adjusted to the right value.

However, on architectures that need padding (i.e., that don't set
CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS), the padding nlattr is added
before the stats, which means that the stored pointer will point to the
padding, and so when the header is fixed up, the result is just a very
big padding nlattr. Because most qdiscs also supply the legacy TCA_STATS
struct, this problem has been mostly invisible, but we exposed it with
the netlink attribute-based statistics in CAKE.

Fix the issue by fixing up the stored pointer if it points to a padding
nlattr.

Signed-off-by: Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>
(cherry picked from commit 3698b34a00d623f87a41179e656b8e89d0bb7267)

1 files changed, 49 insertions, 0 deletions

diff --git a/target/linux/generic/pending-4.9/900-gen_stats-fix-netlink-stats-padding.patch b/target/linux/generic/pending-4.9/900-gen_stats-fix-netlink-stats-padding.patch
new file mode 100644
index 0000000000..f5ceecca93
--- /dev/null
+++ b/target/linux/generic/pending-4.9/900-gen_stats-fix-netlink-stats-padding.patch
@@ -0,0 +1,49 @@
+The gen_stats facility will add a header for the toplevel nlattr of type
+TCA_STATS2 that contains all stats added by qdisc callbacks. A reference
+to this header is stored in the gnet_dump struct, and when all the
+per-qdisc callbacks have finished adding their stats, the length of the
+containing header will be adjusted to the right value.
+
+However, on architectures that need padding (i.e., that don't set
+CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS), the padding nlattr is added
+before the stats, which means that the stored pointer will point to the
+padding, and so when the header is fixed up, the result is just a very
+big padding nlattr. Because most qdiscs also supply the legacy TCA_STATS
+struct, this problem has been mostly invisible, but we exposed it with
+the netlink attribute-based statistics in CAKE.
+
+Fix the issue by fixing up the stored pointer if it points to a padding
+nlattr.
+
+Tested-by: Pete Heist <pete@heistp.net>
+Tested-by: Kevin Darbyshire-Bryant <kevin@darbyshire-bryant.me.uk>
+Signed-off-by: Toke Høiland-Jørgensen <toke@toke.dk>
+---
+ net/core/gen_stats.c |   16 ++++++++++++++--
+ 1 file changed, 14 insertions(+), 2 deletions(-)
+
+--- a/net/core/gen_stats.c
++++ b/net/core/gen_stats.c
+@@ -77,8 +77,20 @@ gnet_stats_start_copy_compat(struct sk_b
+ 		d->lock = lock;
+ 		spin_lock_bh(lock);
+ 	}
+-	if (d->tail)
+-		return gnet_stats_copy(d, type, NULL, 0, padattr);
++	if (d->tail) {
++		int ret = gnet_stats_copy(d, type, NULL, 0, padattr);
++
++		/* The initial attribute added in gnet_stats_copy() may be
++		 * preceded by a padding attribute, in which case d->tail will
++		 * end up pointing at the padding instead of the real attribute.
++		 * Fix this so gnet_stats_finish_copy() adjusts the length of
++		 * the right attribute.
++		 */
++		if (ret == 0 && d->tail->nla_type == padattr)
++			d->tail = (struct nlattr *)((char *)d->tail +
++						    NLA_ALIGN(d->tail->nla_len));
++		return ret;
++	}
+ 
+ 	return 0;
+ }