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Lokesh Dhoundiyal 54f26fc07e ipv4: drop dst in multicast routing path 
[ Upstream commit 9e6c6d17d1d6a3f1515ce399f9a011629ec79aa0 ]

kmemleak reports the following when routing multicast traffic over an
ipsec tunnel.

Kmemleak output:
unreferenced object 0x8000000044bebb00 (size 256):
  comm "softirq", pid 0, jiffies 4294985356 (age 126.810s)
  hex dump (first 32 bytes):
    00 00 00 00 00 00 00 00 80 00 00 00 05 13 74 80  ..............t.
    80 00 00 00 04 9b bf f9 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<00000000f83947e0>] __kmalloc+0x1e8/0x300
    [<00000000b7ed8dca>] metadata_dst_alloc+0x24/0x58
    [<0000000081d32c20>] __ipgre_rcv+0x100/0x2b8
    [<00000000824f6cf1>] gre_rcv+0x178/0x540
    [<00000000ccd4e162>] gre_rcv+0x7c/0xd8
    [<00000000c024b148>] ip_protocol_deliver_rcu+0x124/0x350
    [<000000006a483377>] ip_local_deliver_finish+0x54/0x68
    [<00000000d9271b3a>] ip_local_deliver+0x128/0x168
    [<00000000bd4968ae>] xfrm_trans_reinject+0xb8/0xf8
    [<0000000071672a19>] tasklet_action_common.isra.16+0xc4/0x1b0
    [<0000000062e9c336>] __do_softirq+0x1fc/0x3e0
    [<00000000013d7914>] irq_exit+0xc4/0xe0
    [<00000000a4d73e90>] plat_irq_dispatch+0x7c/0x108
    [<000000000751eb8e>] handle_int+0x16c/0x178
    [<000000001668023b>] _raw_spin_unlock_irqrestore+0x1c/0x28

The metadata dst is leaked when ip_route_input_mc() updates the dst for
the skb. Commit f38a9eb1f7 ("dst: Metadata destinations") correctly
handled dropping the dst in ip_route_input_slow() but missed the
multicast case which is handled by ip_route_input_mc(). Drop the dst in
ip_route_input_mc() avoiding the leak.

Fixes: f38a9eb1f7 ("dst: Metadata destinations")
Signed-off-by: Lokesh Dhoundiyal <lokesh.dhoundiyal@alliedtelesis.co.nz>
Signed-off-by: Chris Packham <chris.packham@alliedtelesis.co.nz>
Reviewed-by: David Ahern <dsahern@kernel.org>
Link: https://lore.kernel.org/r/20220505020017.3111846-1-chris.packham@alliedtelesis.co.nz
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2022-05-18 10:23:43 +02:00
arch arm: remove CONFIG_ARCH_HAS_HOLES_MEMORYMODEL 2022-05-15 20:00:09 +02:00
block block-map: add __GFP_ZERO flag for alloc_page in function bio_copy_kern 2022-05-12 12:25:45 +02:00
certs certs: Trigger creation of RSA module signing key if it's not an RSA key 2021-09-15 09:50:29 +02:00
crypto crypto: authenc - Fix sleep in atomic context in decrypt_tail 2022-04-08 14:39:59 +02:00
Documentation arm: remove CONFIG_ARCH_HAS_HOLES_MEMORYMODEL 2022-05-15 20:00:09 +02:00
drivers net: mscc: ocelot: avoid corrupting hardware counters when moving VCAP filters 2022-05-18 10:23:43 +02:00
fs arm: remove CONFIG_ARCH_HAS_HOLES_MEMORYMODEL 2022-05-15 20:00:09 +02:00
include net: Fix features skip in for_each_netdev_feature() 2022-05-18 10:23:42 +02:00
init init/main.c: return 1 from handled __setup() functions 2022-04-13 21:01:01 +02:00
ipc shm: extend forced shm destroy to support objects from several IPC nses 2021-12-01 09:19:10 +01:00
kernel rcu: Apply callbacks processing time limit only on softirq 2022-05-12 12:25:45 +02:00
lib hex2bin: fix access beyond string end 2022-05-09 09:04:59 +02:00
LICENSES
mm mm: userfaultfd: fix missing cache flush in mcopy_atomic_pte() and __mcopy_atomic() 2022-05-15 20:00:09 +02:00
net ipv4: drop dst in multicast routing path 2022-05-18 10:23:43 +02:00
samples samples/bpf, xdpsock: Fix race when running for fix duration of time 2022-04-08 14:40:21 +02:00
scripts gcc-plugins: latent_entropy: use /dev/urandom 2022-04-20 09:23:26 +02:00
security Fix incorrect type in assignment of ipv6 port for audit 2022-04-08 14:40:31 +02:00
sound ASoC: dmaengine: Restore NULL prepare_slave_config() callback 2022-05-12 12:25:37 +02:00
tools selftests: ocelot: tc_flower_chains: specify conform-exceed action for policer 2022-05-12 12:25:42 +02:00
usr usr/include/Makefile: add linux/nfc.h to the compile-test coverage 2022-02-01 17:25:48 +01:00
virt KVM: Prevent module exit until all VMs are freed 2022-04-08 14:40:38 +02:00
.clang-format RDMA 5.10 pull request 2020-10-17 11:18:18 -07:00
.cocciconfig
.get_maintainer.ignore
.gitattributes
.gitignore kbuild: generate Module.symvers only when vmlinux exists 2021-05-19 10:12:59 +02:00
.mailmap mailmap: add two more addresses of Uwe Kleine-König 2020-12-06 10:19:07 -08:00
COPYING
CREDITS MAINTAINERS: Move Jason Cooper to CREDITS 2020-11-30 10:20:34 +01:00
Kbuild
Kconfig
MAINTAINERS MAINTAINERS: adjust GCC PLUGINS after gcc-plugin.sh removal 2021-12-14 11:32:46 +01:00
Makefile Linux 5.10.116 2022-05-15 20:00:09 +02:00
README

README 

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There are several guides for kernel developers and users. These guides can
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There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
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the problems which may result by upgrading your kernel.