================================================================== BUG: KASAN: null-ptr-deref in atomic_read include/asm-generic/atomic-instrumented.h:26 [inline] BUG: KASAN: null-ptr-deref in atomic_fetch_add_unless include/linux/atomic-fallback.h:1086 [inline] BUG: KASAN: null-ptr-deref in atomic_add_unless include/linux/atomic-fallback.h:1111 [inline] BUG: KASAN: null-ptr-deref in atomic_inc_not_zero include/linux/atomic-fallback.h:1127 [inline] BUG: KASAN: null-ptr-deref in dst_hold_safe include/net/dst.h:297 [inline] BUG: KASAN: null-ptr-deref in ip6_hold_safe+0xad/0x380 net/ipv6/route.c:1050 Read of size 4 at addr 000000000000004c by task syz-executor.2/29958 CPU: 1 PID: 29958 Comm: syz-executor.2 Not tainted 5.2.0-rc2+ #13 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x172/0x1f0 lib/dump_stack.c:113 __kasan_report.cold+0x5/0x40 mm/kasan/report.c:321 kasan_report+0x12/0x20 mm/kasan/common.c:614 check_memory_region_inline mm/kasan/generic.c:185 [inline] check_memory_region+0x123/0x190 mm/kasan/generic.c:191 kasan_check_read+0x11/0x20 mm/kasan/common.c:94 atomic_read include/asm-generic/atomic-instrumented.h:26 [inline] atomic_fetch_add_unless include/linux/atomic-fallback.h:1086 [inline] atomic_add_unless include/linux/atomic-fallback.h:1111 [inline] atomic_inc_not_zero include/linux/atomic-fallback.h:1127 [inline] dst_hold_safe include/net/dst.h:297 [inline] ip6_hold_safe+0xad/0x380 net/ipv6/route.c:1050 rt6_get_pcpu_route net/ipv6/route.c:1277 [inline] ip6_pol_route+0x336/0x1010 net/ipv6/route.c:2028 ip6_pol_route_output+0x54/0x70 net/ipv6/route.c:2204 fib6_rule_lookup+0x279/0x5a0 net/ipv6/fib6_rules.c:120 ip6_route_output_flags+0x2c4/0x350 net/ipv6/route.c:2233 ip6_dst_lookup_tail+0x1124/0x1b30 net/ipv6/ip6_output.c:1054 ip6_dst_lookup_flow+0xa8/0x220 net/ipv6/ip6_output.c:1155 inet6_sk_rebuild_header+0x52b/0xcd0 net/ipv6/af_inet6.c:739 __tcp_retransmit_skb+0x2fc/0x2f30 net/ipv4/tcp_output.c:2870 tcp_send_loss_probe+0x4e8/0x8a0 net/ipv4/tcp_output.c:2545 tcp_write_timer_handler+0x5c0/0x8a0 net/ipv4/tcp_timer.c:587 tcp_write_timer+0x10e/0x1d0 net/ipv4/tcp_timer.c:611 call_timer_fn+0x193/0x720 kernel/time/timer.c:1322 expire_timers kernel/time/timer.c:1366 [inline] __run_timers kernel/time/timer.c:1685 [inline] __run_timers kernel/time/timer.c:1653 [inline] run_timer_softirq+0x66f/0x1740 kernel/time/timer.c:1698 __do_softirq+0x25c/0x94c kernel/softirq.c:293 invoke_softirq kernel/softirq.c:374 [inline] irq_exit+0x180/0x1d0 kernel/softirq.c:414 exiting_irq arch/x86/include/asm/apic.h:536 [inline] smp_apic_timer_interrupt+0x13b/0x550 arch/x86/kernel/apic/apic.c:1068 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:806 RIP: 0010:get_current arch/x86/include/asm/current.h:15 [inline] RIP: 0010:do_syscall_64+0x5b/0x680 arch/x86/entry/common.c:289 Code: ff df 48 c1 ea 03 80 3c 02 00 0f 85 7e 05 00 00 48 83 3d 17 d4 b1 07 00 0f 84 84 04 00 00 e8 cc 05 70 00 fb 66 0f 1f 44 00 00 <65> 4c 8b 34 25 c0 fd 01 00 48 b8 00 00 00 00 00 fc ff df 4c 89 f2 RSP: 0018:ffff88808a17ff20 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13 RAX: ffff888096c5e0c0 RBX: 00000000000000e4 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff81009ff4 RDI: ffff888096c5e93c RBP: ffff88808a17ff48 R08: ffff888096c5e0c0 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff88808a17ff58 R13: ffffffff88b27400 R14: 0000000000000000 R15: 0000000000000000 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45c0ba Code: 25 18 00 00 00 00 74 01 f0 48 0f b1 3d af a6 61 00 48 39 c2 75 da f3 c3 0f 1f 84 00 00 00 00 00 48 63 ff b8 e4 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 06 f3 c3 0f 1f 40 00 48 c7 c2 d4 ff ff ff f7 RSP: 002b:00007fffb739fa78 EFLAGS: 00000246 ORIG_RAX: 00000000000000e4 RAX: ffffffffffffffda RBX: 00000000001ab038 RCX: 000000000045c0ba RDX: 0000000000000000 RSI: 00007fffb739fa80 RDI: 0000000000000001 RBP: 000000000000040a R08: 0000000000000001 R09: 000055555558d940 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000008 R13: 00007fffb739fae0 R14: 00000000001aacff R15: 00007fffb739faf0 ==================================================================