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linux/net/hsr
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Eric Dumazet 2b5b8251bc net: hsr: fix possible NULL deref in hsr_handle_frame() 
hsr_port_get_rcu() can return NULL, so we need to be careful.

general protection fault, probably for non-canonical address 0xdffffc0000000006: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000030-0x0000000000000037]
CPU: 1 PID: 10249 Comm: syz-executor.5 Not tainted 5.5.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__read_once_size include/linux/compiler.h:199 [inline]
RIP: 0010:hsr_addr_is_self+0x86/0x330 net/hsr/hsr_framereg.c:44
Code: 04 00 f3 f3 f3 65 48 8b 04 25 28 00 00 00 48 89 45 d0 31 c0 e8 6b ff 94 f9 4c 89 f2 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <80> 3c 02 00 0f 85 75 02 00 00 48 8b 43 30 49 39 c6 49 89 47 c0 0f
RSP: 0018:ffffc90000da8a90 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff87e0cc33
RDX: 0000000000000006 RSI: ffffffff87e035d5 RDI: 0000000000000000
RBP: ffffc90000da8b20 R08: ffff88808e7de040 R09: ffffed1015d2707c
R10: ffffed1015d2707b R11: ffff8880ae9383db R12: ffff8880a689bc5e
R13: 1ffff920001b5153 R14: 0000000000000030 R15: ffffc90000da8af8
FS:  00007fd7a42be700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b32338000 CR3: 00000000a928c000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 hsr_handle_frame+0x1c5/0x630 net/hsr/hsr_slave.c:31
 __netif_receive_skb_core+0xfbc/0x30b0 net/core/dev.c:5099
 __netif_receive_skb_one_core+0xa8/0x1a0 net/core/dev.c:5196
 __netif_receive_skb+0x2c/0x1d0 net/core/dev.c:5312
 process_backlog+0x206/0x750 net/core/dev.c:6144
 napi_poll net/core/dev.c:6582 [inline]
 net_rx_action+0x508/0x1120 net/core/dev.c:6650
 __do_softirq+0x262/0x98c kernel/softirq.c:292
 do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1082
 </IRQ>

Fixes: c5a7591172 ("net/hsr: Use list_head (and rcu) instead of array for slave devices.")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: syzbot <syzkaller@googlegroups.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
 		2020-02-04 09:27:07 +01:00
..
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 net/hsr: remove seq_nr_after_or_eq 2020-01-21 12:03:21 +01:00
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 dummy hsr_debugfs_rename() declaration 2020-01-08 13:09:54 -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 net: hsr: fix possible NULL deref in hsr_handle_frame() 2020-02-04 09:27:07 +01:00
hsr_slave.h net: hsr: convert to SPDX identifier 2019-04-06 18:32:21 -07:00