I just hit this during my testing. Isn't there another bug lurking?

BUG kmalloc-8: Redzone overwritten

INFO: 0xc0000000de9dec48-0xc0000000de9dec4b. First byte 0x0 instead of 0xcc
INFO: Allocated in .__seq_open_private+0x30/0xa0 age=0 cpu=5 pid=3896
	.__kmalloc+0x1e0/0x2d0
	.__seq_open_private+0x30/0xa0
	.seq_open_net+0x60/0xe0
	.dev_mc_seq_open+0x4c/0x70
	.proc_reg_open+0xd8/0x260
	.__dentry_open.clone.11+0x2b8/0x400
	.do_last+0xf4/0x950
	.path_openat+0xf8/0x480
	.do_filp_open+0x48/0xc0
	.do_sys_open+0x140/0x250
	syscall_exit+0x0/0x40

dev_mc_seq_ops uses dev_seq_start/next/stop but only allocates
sizeof(struct seq_net_private) of private data, whereas it expects
sizeof(struct dev_iter_state):

struct dev_iter_state {
	struct seq_net_private p;
	unsigned int pos; /* bucket << BUCKET_SPACE + offset */
};

Create dev_seq_open_ops and use it so we don't have to expose
struct dev_iter_state.

[ Problem added by commit f04565dd (dev: use name hash for
  dev_seq_ops) -Eric ]

Signed-off-by: Anton Blanchard <anton@samba.org>
Acked-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

To perform PHY calibration and set a different EA value by chip ID,
Whenever the NIC chip power on, ie booting or resuming, we need to
force HW to calibrate PHY parameter again, and also set a proper EA
value which gather from experiment.

Those procedures help to reduce compatible issues(NIC is unable to link
up in some special case) in giga speed.

Signed-off-by: AriesLee <AriesLee@jmicron.com>
Signed-off-by: Guo-Fu Tseng <cooldavid@cooldavid.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

Now inetpeer is the place where we cache redirect information for ipv4
destinations, we must be able to invalidate informations when a route is
added/removed on host.

As inetpeer is not yet namespace aware, this patch adds a shared
redirect_genid, and a per inetpeer redirect_genid. This might be changed
later if inetpeer becomes ns aware.

Cache information for one inerpeer is valid as long as its
redirect_genid has the same value than global redirect_genid.

Reported-by: Arkadiusz Miśkiewicz <a.miskiewicz@gmail.com>
Tested-by: Arkadiusz Miśkiewicz <a.miskiewicz@gmail.com>
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

poll() call may be blocked by concurrent reading from the same stream
socket.

Signed-off-by: Alexey Moiseytsev <himeraster@gmail.com>
Acked-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

We're trying to check if any options are defined which isn't wha the
existing code does due to confusing & and &&.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

When using l2tp over ipsec, the tunnel will hang when rekeying
occurs. Reason is that the transformer bundle attached to the dst entry
is now in STATE_DEAD and thus xfrm_output_one() drops all packets
(XfrmOutStateExpired increases).

Fix this by calling __sk_dst_check (which drops the stale dst
if xfrm dst->check callback finds that the bundle is no longer valid).

Cc: James Chapman <jchapman@katalix.com>
Signed-off-by: Florian Westphal <fw@strlen.de>
Acked-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Better use sk_reset_timer() / sk_stop_timer() helpers to make sure we
dont access already freed/reused memory later.

Reported-by: Sasha Levin <levinsasha928@gmail.com>
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Tested-by: Sasha Levin <levinsasha928@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

commit 88491d81 ("drivers/net: Kconfig
& Makefile cleanup") changed the type of these options to bool, but
they select code that could (and still can) be built as modules.

Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>

The pmtu informations on the inetpeer are visible for output and
input routes. On packet forwarding, we might propagate a learned
pmtu to the sender. As we update the pmtu informations of the
inetpeer on demand, the original sender of the forwarded packets
might never notice when the pmtu to that inetpeer increases.
So use the mtu of the outgoing device on packet forwarding instead
of the pmtu to the final destination.

Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

We move all mtu handling from dst_mtu() down to the protocol
layer. So each protocol can implement the mtu handling in
a different manner.

Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

We plan to invoke the dst_opt->default_mtu() method unconditioally
from dst_mtu(). So rename the method to dst_opt->mtu() to match
the name with the new meaning.

Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

As it is, we return null as the default mtu of blackhole routes.
This may lead to a propagation of a bogus pmtu if the default_mtu
method of a blackhole route is invoked. So return dst->dev->mtu
as the default mtu instead.

Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Skip entries from foreign network namespaces.

Signed-off-by: Jorge Boncompte [DTI2] <jorge@dti2.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

This was copy and pasted from the IPv4 code.  We're calling the
ip4 version of that function and map4 is NULL.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

We can not update iph->daddr in ip_options_rcv_srr(), It is too early.
When some exception ocurred later (eg. in ip_forward() when goto
sr_failed) we need the ip header be identical to the original one as
ICMP need it.

Add a field 'nexthop' in struct ip_options to save nexthop of LSRR
or SSRR option.

Signed-off-by: Li Wei <lw@cn.fujitsu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Use round_jiffies_relative to align the ehea workqueue and avoid
extra wakeups.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

Now that we enable multiqueue by default the ehea driver is using
quite a lot of memory for its buffer pools. With 4 queues we
consume 64MB in the jumbo packet ring, 16MB in the medium packet
ring and 16MB in the tiny packet ring.

We should only fill the jumbo ring once the MTU is increased but
for now halve it's size so it consumes 32MB. Also reduce the tiny
packet ring, with 4 queues we had 16k entries which is overkill.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

When transmiting a fragmented skb, qlge fills a descriptor with the
fragment addresses, after DMA-mapping them. If there are more than eight
fragments, it will use the eighth descriptor as a pointer to an external
list. After mapping this external list, called OAL to a structure
containing more descriptors, it fills it with the extra fragments.

However, considering that systems with pages larger than 8KiB would have
less than 8 fragments, which was true before commit a715dea3, it
defined a macro for the OAL size as 0 in those cases.

Now, if a skb with more than 8 fragments (counting skb->data as one
fragment), this would start overwriting the list of addresses already
mapped and would make the driver fail to properly unmap the right
addresses on architectures with pages larger than 8KiB.

Besides that, the list of mappings was one size too small, since it must
have a mapping for the maxinum number of skb fragments plus one for
skb->data and another for the OAL. So, even on architectures with page
sizes 4KiB and 8KiB, a skb with the maximum number of fragments would
make the driver overwrite its counter for the number of mappings, which,
again, would make it fail to unmap the mapped DMA addresses.

Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Fix port identify test on 5461x PHY by driving LEDs through MDIO.

Signed-off-by: Yaniv Rosner <yanivr@broadcom.com>
Signed-off-by: Eilon Greenstein <eilong@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

When add sources to interface failure, need to roll back the sfcount[MODE]
to before state. We need to match it corresponding.

Acked-by: David L Stevens <dlstevens@us.ibm.com>
Acked-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: Jun Zhao <mypopydev@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Since linux 2.6.26 (commit c6aefafb : Add IPv6 support to TCP SYN
cookies), we can drop a SYN packet reusing a TIME_WAIT socket.

(As a matter of fact we fail to send the SYNACK answer)

As the client resends its SYN packet after a one second timeout, we
accept it, because first packet removed the TIME_WAIT socket before
being dropped.

This probably explains why nobody ever noticed or complained.

Reported-by: Jesse Young <jlyo@jlyo.org>
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Reported issues when using dev_kfree_skb() on UP systems and
systems with low numbers of cores.  dev_kfree_skb_irq() will
properly save IRQ state before freeing the skb.

Tested on 3.1.1 and 3.2_rc2

Example of reproducible trace of kernel 3.1.1
------------[ cut here ]------------
   WARNING: at kernel/softirq.c:159 local_bh_enable+0x32/0x79()
   ...
   Pid: 0, comm: swapper Not tainted 3.1.1-gentoo #1
   Call Trace:
    [<c1022970>] warn_slowpath_common+0x65/0x7a
    [<c102699e>] ? local_bh_enable+0x32/0x79
    [<c1022994>] warn_slowpath_null+0xf/0x13
    [<c102699e>] local_bh_enable+0x32/0x79
    [<c134bfd8>] destroy_conntrack+0x7c/0x9b
    [<c134890b>] nf_conntrack_destroy+0x1f/0x26
    [<c132e3a6>] skb_release_head_state+0x74/0x83
    [<c132e286>] __kfree_skb+0xb/0x6b
    [<c132e30a>] consume_skb+0x24/0x26
    [<c127c925>] b44_poll+0xaa/0x449
    [<c1333ca1>] net_rx_action+0x3f/0xea
    [<c1026a44>] __do_softirq+0x5f/0xd5
    [<c10269e5>] ? local_bh_enable+0x79/0x79
    <IRQ>  [<c1026c32>] ? irq_exit+0x34/0x8d
    [<c1003628>] ? do_IRQ+0x74/0x87
    [<c13f5329>] ? common_interrupt+0x29/0x30
    [<c1006e18>] ? default_idle+0x29/0x3e
    [<c10015a7>] ? cpu_idle+0x2f/0x5d
    [<c13e91c5>] ? rest_init+0x79/0x7b
    [<c15c66a9>] ? start_kernel+0x297/0x29c
    [<c15c60b0>] ? i386_start_kernel+0xb0/0xb7
   ---[ end trace 583f33bb1aa207a9 ]---

Signed-off-by: Xander Hover <LKML@hover.be>
Signed-off-by: David S. Miller <davem@davemloft.net>

Distributions are using this in their default scripts, so don't hide
them behind the advanced setting.

Reported-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

commit 72a3effa ([NET]: Size listen hash tables using backlog
hint) added a bug allowing inet6_synq_hash() to return an out of bound
array index, because of u16 overflow.

Bug can happen if system admins set net.core.somaxconn &
net.ipv4.tcp_max_syn_backlog sysctls to values greater than 65536

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Release skb when transmit rate limit _not_ allow

Signed-off-by: Li Wei <lw@cn.fujitsu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless into for-davem

This reverts commit 4ba7d999.

The original patch was a misguided attempt to improve performance on
some hardware that is apparently prone to spurious interrupt generation.

Signed-off-by: John W. Linville <linville@tuxdriver.com>

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

This reverts commit 23085d57.

The original patch was a misguided attempt to improve performance on
some hardware that is apparently prone to spurious interrupt generation.

Signed-off-by: John W. Linville <linville@tuxdriver.com>

when skb_shift, we want to shift paged data from skb to tgt frag area.
Original comments revert the shift order

Signed-off-by: Feng King <kinwin2008@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Signed-off-by: Maciej Żenczykowski <maze@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

The "tmp" variable here is used to store the result of cpu_to_le16()
so it should be an __le16 instead of an int.  We want the high bits
set and the current code works on little endian systems but not on
big endian systems.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Sjur Brændeland <sjur.brandeland@stericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

The errcode is not updated when ip_route_newports() fails.

Signed-off-by: RongQing.Li <roy.qing.li@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

It was pointed out by "make versioncheck" that we do not need to include
version.h in drivers/net/can/sja1000/peak_pci.c
This patch removes the unneeded include.

Signed-off-by: Jesper Juhl <jj@chaosbits.net>
Acked-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Cc: stable@vger.kernel.org
Signed-off-by: David S. Miller <davem@davemloft.net>

We need to mask the MMC irq otherwise if we raise the mmc
interrupts that are not handled the driver loops in the
handler.
In fact, by default all mmc counters (only used for stats)
are managed in SW and registers are cleared on each READ.

Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

"remote_list" is of type

struct dma_chunk remote_list[VETH_MAX_FRAMES_PER_MSG];

Probably a copy'n'paste error.

Signed-off-by: Thomas Jarosch <thomas.jarosch@intra2net.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

"dwrq->length" is the capped version of "essid->length".

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

By the time userspace returns with a response to
the regulatory domain request, the wiphy causing
the request might have gone away. If this is so,
reject the update but mark the request as having
been processed anyway.

Cc: Luis R. Rodriguez <lrodriguez@qca.qualcomm.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Cc: stable@vger.kernel.org
Signed-off-by: John W. Linville <linville@tuxdriver.com>