================================================================== BUG: KASAN: slab-out-of-bounds in tcp_retransmit_timer+0x2d30/0x3220 net/ipv4/tcp_timer.c:499 Read of size 8 at addr ffff88809d70e310 by task syz-executor.0/18736 CPU: 0 PID: 18736 Comm: syz-executor.0 Not tainted 5.9.0-rc6-syzkaller #0 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+0x198/0x1fd lib/dump_stack.c:118 print_address_description.constprop.0.cold+0xae/0x497 mm/kasan/report.c:383 __kasan_report mm/kasan/report.c:513 [inline] kasan_report.cold+0x1f/0x37 mm/kasan/report.c:530 tcp_retransmit_timer+0x2d30/0x3220 net/ipv4/tcp_timer.c:499 tcp_write_timer_handler+0x79b/0xa60 net/ipv4/tcp_timer.c:610 tcp_write_timer+0xa2/0x2b0 net/ipv4/tcp_timer.c:630 call_timer_fn+0x1ac/0x760 kernel/time/timer.c:1413 expire_timers kernel/time/timer.c:1458 [inline] __run_timers.part.0+0x67c/0xaa0 kernel/time/timer.c:1755 __run_timers kernel/time/timer.c:1736 [inline] run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1768 __do_softirq+0x1f8/0xb23 kernel/softirq.c:298 asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:706 __run_on_irqstack arch/x86/include/asm/irq_stack.h:22 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:48 [inline] do_softirq_own_stack+0x9d/0xd0 arch/x86/kernel/irq_64.c:77 invoke_softirq kernel/softirq.c:393 [inline] __irq_exit_rcu kernel/softirq.c:423 [inline] irq_exit_rcu+0x235/0x280 kernel/softirq.c:435 sysvec_apic_timer_interrupt+0x51/0xf0 arch/x86/kernel/apic/apic.c:1091 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:581 RIP: 0010:unwind_next_frame+0x47e/0x1f90 arch/x86/kernel/unwind_orc.c:470 Code: 4c 89 cf 83 e7 07 40 38 fe 40 0f 9e c7 40 84 f6 40 0f 95 c6 40 84 f7 0f 85 e2 12 00 00 48 89 ce 83 e6 07 40 38 f2 40 0f 9e c6 <84> d2 0f 95 c2 40 84 d6 0f 85 c7 12 00 00 83 e0 0f 3c 09 0f 87 c5 RSP: 0018:ffffc900055df310 EFLAGS: 00000293 RAX: 0000000000000015 RBX: 1ffff92000abbe6a RCX: ffffffff8bd3661b RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001 RBP: 0000000000000001 R08: ffffffff8bd36616 R09: ffffffff8bd3661a R10: 000000000007601f R11: 00000000000299f5 R12: ffffc900055df430 R13: ffffc900055df41d R14: ffffc900055df438 R15: ffffc900055df3e8 arch_stack_walk+0x81/0xf0 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x8c/0xc0 kernel/stacktrace.c:123 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48 kasan_set_track mm/kasan/common.c:56 [inline] __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:461 kmem_cache_alloc_node_trace+0x17b/0x430 mm/slab.c:3594 __do_kmalloc_node mm/slab.c:3614 [inline] __kmalloc_node_track_caller+0x38/0x60 mm/slab.c:3629 __kmalloc_reserve net/core/skbuff.c:142 [inline] pskb_expand_head+0x15a/0x1040 net/core/skbuff.c:1626 skb_ensure_writable net/core/skbuff.c:5455 [inline] skb_ensure_writable+0x2c7/0x450 net/core/skbuff.c:5447 __bpf_try_make_writable net/core/filter.c:1654 [inline] bpf_try_make_writable net/core/filter.c:1660 [inline] bpf_try_make_head_writable net/core/filter.c:1668 [inline] ____bpf_clone_redirect net/core/filter.c:2409 [inline] bpf_clone_redirect+0x125/0x420 net/core/filter.c:2387 bpf_prog_a481c1313990ee2c+0x56/0xff0 bpf_dispatcher_nop_func include/linux/bpf.h:644 [inline] bpf_test_run+0x3be/0xcf0 net/bpf/test_run.c:50 bpf_prog_test_run_skb+0xabc/0x1c50 net/bpf/test_run.c:581 bpf_prog_test_run kernel/bpf/syscall.c:3126 [inline] __do_sys_bpf+0x1b29/0x5140 kernel/bpf/syscall.c:4418 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45de59 Code: 0d b4 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 db b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f71e7953c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 0000000000001780 RCX: 000000000045de59 RDX: 0000000000000040 RSI: 00000000200000c0 RDI: 000000000000000a RBP: 000000000118bf60 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118bf2c R13: 00007ffcfc31f95f R14: 00007f71e79549c0 R15: 000000000118bf2c Allocated by task 3923: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48 kasan_set_track mm/kasan/common.c:56 [inline] __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:461 slab_post_alloc_hook mm/slab.h:518 [inline] slab_alloc mm/slab.c:3312 [inline] kmem_cache_alloc+0x13a/0x3f0 mm/slab.c:3482 getname_flags.part.0+0x50/0x4f0 fs/namei.c:138 getname_flags fs/namei.c:2646 [inline] user_path_at_empty+0xa1/0x100 fs/namei.c:2646 user_path_at include/linux/namei.h:59 [inline] vfs_statx+0x14e/0x390 fs/stat.c:202 vfs_lstat include/linux/fs.h:3178 [inline] __do_sys_newlstat+0x91/0x110 fs/stat.c:374 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Freed by task 3923: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48 kasan_set_track+0x1c/0x30 mm/kasan/common.c:56 kasan_set_free_info+0x1b/0x30 mm/kasan/generic.c:355 __kasan_slab_free+0xd8/0x120 mm/kasan/common.c:422 __cache_free mm/slab.c:3418 [inline] kmem_cache_free.part.0+0x74/0x1e0 mm/slab.c:3693 putname+0xe1/0x120 fs/namei.c:259 filename_lookup+0x3b1/0x560 fs/namei.c:2376 user_path_at include/linux/namei.h:59 [inline] vfs_statx+0x14e/0x390 fs/stat.c:202 vfs_lstat include/linux/fs.h:3178 [inline] __do_sys_newlstat+0x91/0x110 fs/stat.c:374 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 The buggy address belongs to the object at ffff88809d70e980 which belongs to the cache names_cache of size 4096 The buggy address is located 1648 bytes to the left of 4096-byte region [ffff88809d70e980, ffff88809d70f980) The buggy address belongs to the page: page:000000009482544a refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x9d70e head:000000009482544a order:1 compound_mapcount:0 flags: 0xfffe0000010200(slab|head) raw: 00fffe0000010200 ffffea000162ad88 ffffea0002812588 ffff8880aa221c00 raw: 0000000000000000 ffff88809d70e980 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88809d70e200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88809d70e280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88809d70e300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff88809d70e380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88809d70e400: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================