================================================================== BUG: KASAN: slab-out-of-bounds in tcp_retransmit_timer+0x2d30/0x3220 net/ipv4/tcp_timer.c:499 Read of size 8 at addr ffff888098678250 by task syz-executor.1/5047 CPU: 0 PID: 5047 Comm: syz-executor.1 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:ext4_get_group_desc+0x8e/0x4e0 fs/ext4/balloc.c:282 Code: 0f 8e c9 03 00 00 45 8b 7c 24 40 44 89 fe 89 df 4c 8b a5 68 06 00 00 e8 d0 4a 74 ff 44 39 fb 0f 83 78 03 00 00 e8 e2 4e 74 ff <49> 8d bc 24 a8 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 RSP: 0018:ffffc90001a17aa8 EFLAGS: 00000293 RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffffffff820238c0 RDX: ffff888093ca4140 RSI: ffffffff820238ce RDI: 0000000000000004 RBP: ffff888214b26000 R08: ffffffffffffffff R09: ffff8880853704eb R10: 0000000000000001 R11: 0000000000000000 R12: ffff888214b28000 R13: 0000000000000000 R14: ffff888214b26668 R15: 0000000000000010 recently_deleted fs/ext4/ialloc.c:678 [inline] find_inode_bit+0x1b8/0x570 fs/ext4/ialloc.c:724 __ext4_new_inode+0xc83/0x5390 fs/ext4/ialloc.c:927 ext4_mkdir+0x3b1/0xdf0 fs/ext4/namei.c:2800 vfs_mkdir+0x507/0x770 fs/namei.c:3649 do_mkdirat+0x262/0x2d0 fs/namei.c:3672 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45d277 Code: 1f 40 00 b8 5a 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 dd bf fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 b8 53 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 bd bf fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fffe19cc0b8 EFLAGS: 00000206 ORIG_RAX: 0000000000000053 RAX: ffffffffffffffda RBX: 00000000001aa0d5 RCX: 000000000045d277 RDX: 00007fffe19cc105 RSI: 00000000000001ff RDI: 00007fffe19cc100 RBP: 0000000000000314 R08: 0000000000000000 R09: 0000000000000005 R10: 0000000000000064 R11: 0000000000000206 R12: 000000000000000e R13: 00007fffe19cc0f0 R14: 00000000001a9f0a R15: 00007fffe19cc100 Allocated by task 9960: 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 9960: 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 ffff888098678c80 which belongs to the cache names_cache of size 4096 The buggy address is located 2608 bytes to the left of 4096-byte region [ffff888098678c80, ffff888098679c80) The buggy address belongs to the page: page:00000000bdd061f4 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x98678 head:00000000bdd061f4 order:1 compound_mapcount:0 flags: 0xfffe0000010200(slab|head) raw: 00fffe0000010200 ffffea00017b7788 ffffea00029d2908 ffff8880aa221c00 raw: 0000000000000000 ffff888098678c80 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888098678100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888098678180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888098678200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff888098678280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888098678300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================