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Taehee Yoo 04b69426d8 hsr: fix slab-out-of-bounds Read in hsr_debugfs_rename() 
hsr slave interfaces don't have debugfs directory.
So, hsr_debugfs_rename() shouldn't be called when hsr slave interface name
is changed.

Test commands:
    ip link add dummy0 type dummy
    ip link add dummy1 type dummy
    ip link add hsr0 type hsr slave1 dummy0 slave2 dummy1
    ip link set dummy0 name ap

Splat looks like:
[21071.899367][T22666] ap: renamed from dummy0
[21071.914005][T22666] ==================================================================
[21071.919008][T22666] BUG: KASAN: slab-out-of-bounds in hsr_debugfs_rename+0xaa/0xb0 [hsr]
[21071.923640][T22666] Read of size 8 at addr ffff88805febcd98 by task ip/22666
[21071.926941][T22666]
[21071.927750][T22666] CPU: 0 PID: 22666 Comm: ip Not tainted 5.5.0-rc2+ #240
[21071.929919][T22666] Hardware name: innotek GmbH VirtualBox/VirtualBox, BIOS VirtualBox 12/01/2006
[21071.935094][T22666] Call Trace:
[21071.935867][T22666]  dump_stack+0x96/0xdb
[21071.936687][T22666]  ? hsr_debugfs_rename+0xaa/0xb0 [hsr]
[21071.937774][T22666]  print_address_description.constprop.5+0x1be/0x360
[21071.939019][T22666]  ? hsr_debugfs_rename+0xaa/0xb0 [hsr]
[21071.940081][T22666]  ? hsr_debugfs_rename+0xaa/0xb0 [hsr]
[21071.940949][T22666]  __kasan_report+0x12a/0x16f
[21071.941758][T22666]  ? hsr_debugfs_rename+0xaa/0xb0 [hsr]
[21071.942674][T22666]  kasan_report+0xe/0x20
[21071.943325][T22666]  hsr_debugfs_rename+0xaa/0xb0 [hsr]
[21071.944187][T22666]  hsr_netdev_notify+0x1fe/0x9b0 [hsr]
[21071.945052][T22666]  ? __module_text_address+0x13/0x140
[21071.945897][T22666]  notifier_call_chain+0x90/0x160
[21071.946743][T22666]  dev_change_name+0x419/0x840
[21071.947496][T22666]  ? __read_once_size_nocheck.constprop.6+0x10/0x10
[21071.948600][T22666]  ? netdev_adjacent_rename_links+0x280/0x280
[21071.949577][T22666]  ? __read_once_size_nocheck.constprop.6+0x10/0x10
[21071.950672][T22666]  ? lock_downgrade+0x6e0/0x6e0
[21071.951345][T22666]  ? do_setlink+0x811/0x2ef0
[21071.951991][T22666]  do_setlink+0x811/0x2ef0
[21071.952613][T22666]  ? is_bpf_text_address+0x81/0xe0
[ ... ]

Reported-by: syzbot+9328206518f08318a5fd@syzkaller.appspotmail.com
Fixes: 4c2d5e33dc ("hsr: rename debugfs file when interface name is changed")
Signed-off-by: Taehee Yoo <ap420073@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
 		2019-12-30 20:36:27 -08:00
..
Kconfig treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
Makefile treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
hsr_debugfs.c hsr: rename debugfs file when interface name is changed 2019-12-25 16:35:35 -08:00
hsr_device.c hsr: reset network header when supervision frame is created 2019-12-25 16:35:35 -08:00
hsr_device.h hsr: switch ->dellink() to ->ndo_uninit() 2019-07-11 14:37:45 -07:00
hsr_forward.c net: hsr: add tx stats for master interface 2019-04-15 17:22:02 -07:00
hsr_forward.h net: hsr: convert to SPDX identifier 2019-04-06 18:32:21 -07:00
hsr_framereg.c hsr: fix a race condition in node list insertion and deletion 2019-12-25 16:35:35 -08:00
hsr_framereg.h hsr: fix a race condition in node list insertion and deletion 2019-12-25 16:35:35 -08:00
hsr_main.c hsr: fix slab-out-of-bounds Read in hsr_debugfs_rename() 2019-12-30 20:36:27 -08:00
hsr_main.h hsr: fix a race condition in node list insertion and deletion 2019-12-25 16:35:35 -08:00
hsr_netlink.c hsr: add hsr root debugfs directory 2019-12-25 16:35:35 -08:00
hsr_netlink.h net: hsr: convert to SPDX identifier 2019-04-06 18:32:21 -07:00
hsr_slave.c hsr: fix a memory leak in hsr_del_port() 2019-07-05 15:22:27 -07:00
hsr_slave.h net: hsr: convert to SPDX identifier 2019-04-06 18:32:21 -07:00