================================================================== BUG: KASAN: slab-out-of-bounds in tcp_retransmit_timer+0x2d30/0x3220 net/ipv4/tcp_timer.c:500 Read of size 8 at addr ffff888098298350 by task syz-executor.2/31445 CPU: 0 PID: 31445 Comm: syz-executor.2 Not tainted 5.9.0-rc1-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+0x18f/0x20d 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:500 tcp_write_timer_handler+0x79b/0xa60 net/ipv4/tcp_timer.c:611 tcp_write_timer+0xa2/0x2b0 net/ipv4/tcp_timer.c:631 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+0xae/0x1a0 kernel/time/timer.c:1768 __do_softirq+0x2de/0xa24 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+0x1f3/0x230 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:arch_local_irq_restore arch/x86/include/asm/paravirt.h:770 [inline] RIP: 0010:lock_acquire+0x27b/0xad0 kernel/locking/lockdep.c:5008 Code: 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 0f 85 f8 06 00 00 48 83 3d fa ca 5b 08 00 0f 84 a6 05 00 00 48 8b 7c 24 08 57 9d <0f> 1f 44 00 00 48 b8 00 00 00 00 00 fc ff df 48 03 44 24 10 48 c7 RSP: 0018:ffffc900065b7278 EFLAGS: 00000286 RAX: 1ffffffff136c781 RBX: ffff88804e08a340 RCX: 00000000a69ca705 RDX: dffffc0000000000 RSI: 0000000000000001 RDI: 0000000000000286 RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff8c5fc9e7 R10: fffffbfff18bf93c R11: 0000000000000000 R12: 0000000000000002 R13: ffffffff89bd6b40 R14: 0000000000000000 R15: ffff88804e08a340 rcu_lock_acquire include/linux/rcupdate.h:241 [inline] rcu_read_lock include/linux/rcupdate.h:634 [inline] ext4_get_group_desc+0x11c/0x4e0 fs/ext4/balloc.c:284 __ext4_get_inode_loc+0x1fd/0x12f0 fs/ext4/inode.c:4271 ext4_get_inode_loc fs/ext4/inode.c:4402 [inline] ext4_reserve_inode_write+0x107/0x280 fs/ext4/inode.c:5643 __ext4_mark_inode_dirty+0x182/0x910 fs/ext4/inode.c:5810 __ext4_new_inode+0x2166/0x5390 fs/ext4/ialloc.c:1193 ext4_create+0x327/0x4a0 fs/ext4/namei.c:2624 lookup_open.isra.0+0xf85/0x1350 fs/namei.c:3103 open_last_lookups fs/namei.c:3177 [inline] path_openat+0x96d/0x2730 fs/namei.c:3365 do_filp_open+0x17e/0x3c0 fs/namei.c:3395 do_sys_openat2+0x16d/0x420 fs/open.c:1168 do_sys_open fs/open.c:1184 [inline] __do_sys_openat fs/open.c:1200 [inline] __se_sys_openat fs/open.c:1195 [inline] __x64_sys_openat+0x13f/0x1f0 fs/open.c:1195 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45d5b9 Code: 5d 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 2b b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f1108484c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00000000000223c0 RCX: 000000000045d5b9 RDX: 00000000000026e1 RSI: 0000000020000040 RDI: ffffffffffffff9c RBP: 000000000118cf88 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118cf4c R13: 00007ffcfa4a1f5f R14: 00007f11084859c0 R15: 000000000118cf4c Allocated by task 31130: 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+0x138/0x3a0 mm/slab.c:3482 getname_flags.part.0+0x50/0x4f0 fs/namei.c:138 getname_flags+0x9a/0xe0 include/linux/audit.h:320 getname fs/namei.c:209 [inline] do_symlinkat+0x86/0x2c0 fs/namei.c:3975 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Freed by task 31130: 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+0x67/0x1f0 mm/slab.c:3693 putname+0xe1/0x120 fs/namei.c:259 do_symlinkat+0x1b2/0x2c0 fs/namei.c:3993 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 ffff8880982986c0 which belongs to the cache names_cache of size 4096 The buggy address is located 880 bytes to the left of 4096-byte region [ffff8880982986c0, ffff8880982996c0) The buggy address belongs to the page: page:0000000072393d01 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x98298 head:0000000072393d01 order:1 compound_mapcount:0 flags: 0xfffe0000010200(slab|head) raw: 00fffe0000010200 ffffea00013da908 ffffea000174fb08 ffff8880aa241c00 raw: 0000000000000000 ffff8880982986c0 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888098298200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888098298280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888098298300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff888098298380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888098298400: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================