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| author | Taehee Yoo <ap420073@gmail.com> | 2019-12-28 16:28:09 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2019-12-30 20:36:27 -0800 |
| commit | 04b69426d846cd04ca9acefff1ea39e1c64d2714 (patch) | |
| tree | 1a898f1a4c8460655a6cbdcd716f95cf28587ee2 /net/hsr | |
| parent | a5b72a083da197b493c7ed1e5730d62d3199f7d6 (diff) | |
| download | linux-04b69426d846cd04ca9acefff1ea39e1c64d2714.tar.gz linux-04b69426d846cd04ca9acefff1ea39e1c64d2714.tar.bz2 linux-04b69426d846cd04ca9acefff1ea39e1c64d2714.zip | |
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: 4c2d5e33dcd3 ("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>
Diffstat (limited to 'net/hsr')
| -rw-r--r-- | net/hsr/hsr_main.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/net/hsr/hsr_main.c b/net/hsr/hsr_main.c index d2ee7125a7f1..9e389accbfc7 100644 --- a/net/hsr/hsr_main.c +++ b/net/hsr/hsr_main.c @@ -46,7 +46,8 @@ static int hsr_netdev_notify(struct notifier_block *nb, unsigned long event, hsr_check_carrier_and_operstate(hsr); break; case NETDEV_CHANGENAME: - hsr_debugfs_rename(dev); + if (is_hsr_master(dev)) + hsr_debugfs_rename(dev); break; case NETDEV_CHANGEADDR: if (port->type == HSR_PT_MASTER) { |