================================================================== BUG: KASAN: slab-use-after-free in rose_get_neigh+0x1b6/0x6f0 net/rose/rose_route.c:692 Read of size 1 at addr ffff88806e67e430 by task syz-executor.1/8976 CPU: 0 PID: 8976 Comm: syz-executor.1 Not tainted 6.9.0-syzkaller-05151-g1b294a1f3561 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114 print_address_description mm/kasan/report.c:377 [inline] print_report+0x169/0x550 mm/kasan/report.c:488 kasan_report+0x143/0x180 mm/kasan/report.c:601 rose_get_neigh+0x1b6/0x6f0 net/rose/rose_route.c:692 rose_connect+0x45a/0x1170 net/rose/af_rose.c:808 __sys_connect_file net/socket.c:2048 [inline] __sys_connect+0x2df/0x310 net/socket.c:2065 __do_sys_connect net/socket.c:2075 [inline] __se_sys_connect net/socket.c:2072 [inline] __x64_sys_connect+0x7a/0x90 net/socket.c:2072 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fd00407cee9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 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 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fd004df80c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002a RAX: ffffffffffffffda RBX: 00007fd0041abf80 RCX: 00007fd00407cee9 RDX: 000000000000001c RSI: 00000000200002c0 RDI: 0000000000000004 RBP: 00007fd0040c949e R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007fd0041abf80 R15: 00007ffd92955b58 Allocated by task 6947: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:370 [inline] __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:387 kasan_kmalloc include/linux/kasan.h:211 [inline] kmalloc_trace+0x1db/0x370 mm/slub.c:4070 kmalloc include/linux/slab.h:628 [inline] rose_add_node+0x209/0xda0 net/rose/rose_route.c:85 rose_rt_ioctl+0xa6f/0xed0 net/rose/rose_route.c:747 rose_ioctl+0x3cb/0x9d0 net/rose/af_rose.c:1372 sock_do_ioctl+0x158/0x460 net/socket.c:1222 sock_ioctl+0x629/0x8e0 net/socket.c:1341 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:904 [inline] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:890 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 8934: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:579 poison_slab_object+0xa6/0xe0 mm/kasan/common.c:240 __kasan_slab_free+0x37/0x60 mm/kasan/common.c:256 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2121 [inline] slab_free mm/slub.c:4353 [inline] kfree+0x153/0x3b0 mm/slub.c:4463 rose_rt_device_down+0x6e5/0x740 net/rose/rose_route.c:522 rose_device_event+0x601/0x6a0 net/rose/af_rose.c:248 notifier_call_chain+0x19f/0x3e0 kernel/notifier.c:93 call_netdevice_notifiers_extack net/core/dev.c:2030 [inline] call_netdevice_notifiers net/core/dev.c:2044 [inline] dev_close_many+0x33c/0x4c0 net/core/dev.c:1585 dev_close+0x1c0/0x2c0 net/core/dev.c:1607 bpq_device_event+0x372/0x8b0 drivers/net/hamradio/bpqether.c:547 notifier_call_chain+0x19f/0x3e0 kernel/notifier.c:93 __dev_notify_flags+0x207/0x400 dev_change_flags+0xf0/0x1a0 net/core/dev.c:8857 dev_ifsioc+0x7c8/0xe70 net/core/dev_ioctl.c:530 dev_ioctl+0x719/0x1340 net/core/dev_ioctl.c:787 sock_do_ioctl+0x240/0x460 net/socket.c:1236 sock_ioctl+0x629/0x8e0 net/socket.c:1341 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:904 [inline] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:890 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff88806e67e400 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 48 bytes inside of freed 512-byte region [ffff88806e67e400, ffff88806e67e600) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88806e67fc00 pfn:0x6e67c head: order:2 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000a40(workingset|slab|head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000a40 ffff888015041c80 ffffea0000bbf910 ffffea0000816f10 raw: ffff88806e67fc00 0000000000100009 00000001ffffffff 0000000000000000 head: 00fff00000000a40 ffff888015041c80 ffffea0000bbf910 ffffea0000816f10 head: ffff88806e67fc00 0000000000100009 00000001ffffffff 0000000000000000 head: 00fff00000000002 ffffea0001b99f01 dead000000000122 00000000ffffffff head: 0000000400000000 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 2, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 4546, tgid 4546 (udevd), ts 62427633438, free_ts 62346485632 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1ea/0x210 mm/page_alloc.c:1534 prep_new_page mm/page_alloc.c:1541 [inline] get_page_from_freelist+0x3410/0x35b0 mm/page_alloc.c:3317 __alloc_pages+0x256/0x6c0 mm/page_alloc.c:4575 __alloc_pages_node include/linux/gfp.h:238 [inline] alloc_pages_node include/linux/gfp.h:261 [inline] alloc_slab_page+0x5f/0x160 mm/slub.c:2190 allocate_slab mm/slub.c:2353 [inline] new_slab+0x84/0x2f0 mm/slub.c:2406 ___slab_alloc+0xb07/0x12e0 mm/slub.c:3592 __slab_alloc mm/slub.c:3682 [inline] __slab_alloc_node mm/slub.c:3735 [inline] slab_alloc_node mm/slub.c:3908 [inline] kmalloc_trace+0x269/0x370 mm/slub.c:4065 kmalloc include/linux/slab.h:628 [inline] kzalloc include/linux/slab.h:749 [inline] kernfs_fop_open+0x3e0/0xd10 fs/kernfs/file.c:623 do_dentry_open+0x907/0x15a0 fs/open.c:955 do_open fs/namei.c:3650 [inline] path_openat+0x2860/0x3240 fs/namei.c:3807 do_filp_open+0x235/0x490 fs/namei.c:3834 do_sys_openat2+0x13e/0x1d0 fs/open.c:1406 do_sys_open fs/open.c:1421 [inline] __do_sys_openat fs/open.c:1437 [inline] __se_sys_openat fs/open.c:1432 [inline] __x64_sys_openat+0x247/0x2a0 fs/open.c:1432 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f page last free pid 5119 tgid 5119 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1141 [inline] free_unref_page_prepare+0x986/0xab0 mm/page_alloc.c:2347 free_unref_page+0x37/0x3f0 mm/page_alloc.c:2487 stack_depot_save_flags+0x6f6/0x830 lib/stackdepot.c:673 kasan_save_stack mm/kasan/common.c:48 [inline] kasan_save_track+0x51/0x80 mm/kasan/common.c:68 unpoison_slab_object mm/kasan/common.c:312 [inline] __kasan_slab_alloc+0x66/0x80 mm/kasan/common.c:338 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slub.c:3871 [inline] slab_alloc_node mm/slub.c:3918 [inline] kmem_cache_alloc+0x174/0x350 mm/slub.c:3925 insert_revoke_hash+0x29/0x2a0 fs/jbd2/revoke.c:145 __ext4_forget+0x332/0x9a0 fs/ext4/ext4_jbd2.c:307 ext4_free_blocks+0x700/0x2420 fs/ext4/mballoc.c:6635 ext4_ext_rm_idx+0x3b2/0x880 fs/ext4/extents.c:2308 ext4_ext_rm_leaf fs/ext4/extents.c:2762 [inline] ext4_ext_remove_space+0x3320/0x4e40 fs/ext4/extents.c:2934 ext4_ext_truncate+0x159/0x2b0 fs/ext4/extents.c:4440 ext4_truncate+0xa18/0x1180 fs/ext4/inode.c:4146 ext4_evict_inode+0x90f/0xf50 fs/ext4/inode.c:258 evict+0x2a8/0x630 fs/inode.c:667 do_unlinkat+0x512/0x830 fs/namei.c:4414 Memory state around the buggy address: ffff88806e67e300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88806e67e380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88806e67e400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88806e67e480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88806e67e500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================