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BUG: KASAN: null-ptr-deref in generic_hwtstamp_ioctl_lower+0x190/0x2d0
Read of size 24 at addr 0000000000000010 by task syz.1.5624/27806

CPU: 1 UID: 0 PID: 27806 Comm: syz.1.5624 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250
 kasan_report+0x118/0x150
 kasan_check_range+0x2b0/0x2c0
 __asan_memcpy+0x29/0x70
 generic_hwtstamp_ioctl_lower+0x190/0x2d0
 tsconfig_prepare_data+0x12c/0x600
 ethnl_default_doit+0x4bc/0xcd0
 genl_family_rcv_msg_doit+0x215/0x300
 genl_rcv_msg+0x60e/0x790
 netlink_rcv_skb+0x208/0x470
 genl_rcv+0x28/0x40
 netlink_unicast+0x82f/0x9e0
 netlink_sendmsg+0x805/0xb30
 __sock_sendmsg+0x21c/0x270
 ____sys_sendmsg+0x505/0x830
 ___sys_sendmsg+0x21f/0x2a0
 __x64_sys_sendmsg+0x19b/0x260
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6976b8ec29
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f6977a60038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f6976dd5fa0 RCX: 00007f6976b8ec29
RDX: 0000000000000000 RSI: 0000200000000240 RDI: 0000000000000006
RBP: 00007f6976c11e41 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f6976dd6038 R14: 00007f6976dd5fa0 R15: 00007ffc76eec118
 </TASK>
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