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Subjectgeneral protection fault in alb_fasten_mac_swap
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Hello,

syzbot found the following crash on:

HEAD commit: 54dedb5b Merge tag 'for-linus-5.6-rc3-tag' of git://git.ke..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=15d7da7ee00000
kernel config: https://syzkaller.appspot.com/x/.config?x=3e57a6b450fb9883
dashboard link: https://syzkaller.appspot.com/bug?extid=d54e40cf758e447e088e
compiler: clang version 10.0.0 (https://github.com/llvm/llvm-project/ c2443155a0fb245c8f17f2c1c72b6ea391e86e81)

Unfortunately, I don't have any reproducer for this crash yet.

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+d54e40cf758e447e088e@syzkaller.appspotmail.com

bond189: (slave bridge130): making interface the new active one
device bridge130 entered promiscuous mode
general protection fault, probably for non-canonical address 0xdffffc0000000006: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000030-0x0000000000000037]
CPU: 0 PID: 2313 Comm: syz-executor.3 Not tainted 5.6.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:rlb_req_update_slave_clients drivers/net/bonding/bond_alb.c:505 [inline]
RIP: 0010:alb_fasten_mac_swap+0x67c/0xda0 drivers/net/bonding/bond_alb.c:1063
Code: f7 48 8b 45 98 42 80 3c 30 00 74 08 48 89 df e8 6a bd e4 fc 4c 8b 33 45 89 e4 49 c1 e4 06 4b 8d 5c 26 30 48 89 d8 48 c1 e8 03 <42> 80 3c 38 00 74 08 48 89 df e8 45 bd e4 fc 48 8b 45 90 48 39 03
RSP: 0018:ffffc90004edee40 EFLAGS: 00010206
RAX: 0000000000000006 RBX: 0000000000000030 RCX: 0000000000000002
RDX: 0000000000000001 RSI: 0000000000000000 RDI: 00000000ffffffff
RBP: ffffc90004edeeb0 R08: ffffffff84cf74ca R09: fffff520009dbdbc
R10: fffff520009dbdbc R11: 0000000000000000 R12: 0000000000000000
R13: ffff888044db0b80 R14: 0000000000000000 R15: dffffc0000000000
FS: 00007fcb902f3700(0000) GS:ffff8880aea00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000071a158 CR3: 00000000a816b000 CR4: 00000000001426f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
bond_alb_handle_active_change+0x147f/0x1ba0 drivers/net/bonding/bond_alb.c:1750
bond_change_active_slave+0x8c0/0x2b20 drivers/net/bonding/bond_main.c:910
bond_select_active_slave+0x584/0xa80 drivers/net/bonding/bond_main.c:986
bond_enslave+0x42af/0x59c0 drivers/net/bonding/bond_main.c:1823
do_set_master net/core/rtnetlink.c:2468 [inline]
__rtnl_newlink net/core/rtnetlink.c:3346 [inline]
rtnl_newlink+0x182f/0x1c00 net/core/rtnetlink.c:3377
rtnetlink_rcv_msg+0x889/0xd40 net/core/rtnetlink.c:5436
netlink_rcv_skb+0x19e/0x3e0 net/netlink/af_netlink.c:2478
rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:5454
netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline]
netlink_unicast+0x766/0x920 net/netlink/af_netlink.c:1329
netlink_sendmsg+0xa2b/0xd40 net/netlink/af_netlink.c:1918
sock_sendmsg_nosec net/socket.c:652 [inline]
sock_sendmsg net/socket.c:672 [inline]
____sys_sendmsg+0x4f7/0x7f0 net/socket.c:2343
___sys_sendmsg net/socket.c:2397 [inline]
__sys_sendmsg+0x1ed/0x290 net/socket.c:2430
__do_sys_sendmsg net/socket.c:2439 [inline]
__se_sys_sendmsg net/socket.c:2437 [inline]
__x64_sys_sendmsg+0x7f/0x90 net/socket.c:2437
do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:294
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45c429
Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fcb902f2c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fcb902f36d4 RCX: 000000000045c429
RDX: 0000000006000000 RSI: 0000000020000080 RDI: 0000000000000003
RBP: 000000000076bfc0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000000009f9 R14: 00000000004cc6da R15: 000000000076bfcc
Modules linked in:
---[ end trace 360aa5d46d32c48b ]---
RIP: 0010:rlb_req_update_slave_clients drivers/net/bonding/bond_alb.c:505 [inline]
RIP: 0010:alb_fasten_mac_swap+0x67c/0xda0 drivers/net/bonding/bond_alb.c:1063
Code: f7 48 8b 45 98 42 80 3c 30 00 74 08 48 89 df e8 6a bd e4 fc 4c 8b 33 45 89 e4 49 c1 e4 06 4b 8d 5c 26 30 48 89 d8 48 c1 e8 03 <42> 80 3c 38 00 74 08 48 89 df e8 45 bd e4 fc 48 8b 45 90 48 39 03
RSP: 0018:ffffc90004edee40 EFLAGS: 00010206
RAX: 0000000000000006 RBX: 0000000000000030 RCX: 0000000000000002
RDX: 0000000000000001 RSI: 0000000000000000 RDI: 00000000ffffffff
RBP: ffffc90004edeeb0 R08: ffffffff84cf74ca R09: fffff520009dbdbc
R10: fffff520009dbdbc R11: 0000000000000000 R12: 0000000000000000
R13: ffff888044db0b80 R14: 0000000000000000 R15: dffffc0000000000
FS: 00007fcb902f3700(0000) GS:ffff8880aea00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000071a158 CR3: 00000000a816b000 CR4: 00000000001426f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
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