================================================================== BUG: KASAN: slab-out-of-bounds in jfs_readdir+0x1b79/0x4660 fs/jfs/jfs_dtree.c:2894 Read of size 1 at addr ffff88807b398915 by task syz.4.28/5332 CPU: 1 PID: 5332 Comm: syz.4.28 Not tainted 6.10.0-rc6-syzkaller-00163-g661e504db04c #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024 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 jfs_readdir+0x1b79/0x4660 fs/jfs/jfs_dtree.c:2894 wrap_directory_iterator+0x94/0xe0 fs/readdir.c:67 iterate_dir+0x57a/0x810 fs/readdir.c:110 __do_sys_getdents fs/readdir.c:326 [inline] __se_sys_getdents+0x1ef/0x4d0 fs/readdir.c:311 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fb2db175bd9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fb2dbe9c048 EFLAGS: 00000246 ORIG_RAX: 000000000000004e RAX: ffffffffffffffda RBX: 00007fb2db303f60 RCX: 00007fb2db175bd9 RDX: 00000000000000b8 RSI: 0000000020001fc0 RDI: 0000000000000006 RBP: 00007fb2db1e4aa1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007fb2db303f60 R15: 00007ffd27004fe8 Allocated by task 5332: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/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:3940 [inline] slab_alloc_node mm/slub.c:4002 [inline] kmem_cache_alloc_lru_noprof+0x139/0x2b0 mm/slub.c:4021 jfs_alloc_inode+0x28/0x70 fs/jfs/super.c:105 alloc_inode fs/inode.c:261 [inline] iget_locked+0x1ad/0x850 fs/inode.c:1280 jfs_iget+0x22/0x3b0 fs/jfs/inode.c:29 jfs_fill_super+0x808/0xc50 fs/jfs/super.c:580 mount_bdev+0x20a/0x2d0 fs/super.c:1668 legacy_get_tree+0xee/0x190 fs/fs_context.c:662 vfs_get_tree+0x90/0x2a0 fs/super.c:1789 do_new_mount+0x2be/0xb40 fs/namespace.c:3352 do_mount fs/namespace.c:3692 [inline] __do_sys_mount fs/namespace.c:3898 [inline] __se_sys_mount+0x2d9/0x3c0 fs/namespace.c:3875 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff88807b398000 which belongs to the cache jfs_ip of size 2240 The buggy address is located 85 bytes to the right of allocated 2240-byte region [ffff88807b398000, ffff88807b3988c0) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7b398 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 memcg:ffff88807c4ca101 flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffefff(slab) raw: 00fff00000000040 ffff8880197928c0 dead000000000122 0000000000000000 raw: 0000000000000000 00000000800d000d 00000001ffffefff ffff88807c4ca101 head: 00fff00000000040 ffff8880197928c0 dead000000000122 0000000000000000 head: 0000000000000000 00000000800d000d 00000001ffffefff ffff88807c4ca101 head: 00fff00000000003 ffffea0001ece601 ffffffffffffffff 0000000000000000 head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Reclaimable, gfp_mask 0x1d2050(__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL|__GFP_RECLAIMABLE), pid 5332, tgid 5331 (syz.4.28), ts 98176120799, free_ts 96582287018 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1473 prep_new_page mm/page_alloc.c:1481 [inline] get_page_from_freelist+0x2e4c/0x2f10 mm/page_alloc.c:3425 __alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4683 __alloc_pages_node_noprof include/linux/gfp.h:269 [inline] alloc_pages_node_noprof include/linux/gfp.h:296 [inline] alloc_slab_page+0x5f/0x120 mm/slub.c:2265 allocate_slab+0x5a/0x2f0 mm/slub.c:2428 new_slab mm/slub.c:2481 [inline] ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3667 __slab_alloc+0x58/0xa0 mm/slub.c:3757 __slab_alloc_node mm/slub.c:3810 [inline] slab_alloc_node mm/slub.c:3990 [inline] kmem_cache_alloc_lru_noprof+0x1c5/0x2b0 mm/slub.c:4021 jfs_alloc_inode+0x28/0x70 fs/jfs/super.c:105 alloc_inode fs/inode.c:261 [inline] iget_locked+0x1ad/0x850 fs/inode.c:1280 jfs_iget+0x22/0x3b0 fs/jfs/inode.c:29 jfs_fill_super+0x808/0xc50 fs/jfs/super.c:580 mount_bdev+0x20a/0x2d0 fs/super.c:1668 legacy_get_tree+0xee/0x190 fs/fs_context.c:662 vfs_get_tree+0x90/0x2a0 fs/super.c:1789 do_new_mount+0x2be/0xb40 fs/namespace.c:3352 page last free pid 5330 tgid 5329 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1093 [inline] free_unref_page+0xd19/0xea0 mm/page_alloc.c:2588 discard_slab mm/slub.c:2527 [inline] __put_partials+0xeb/0x130 mm/slub.c:2995 put_cpu_partial+0x17c/0x250 mm/slub.c:3070 __slab_free+0x2ea/0x3d0 mm/slub.c:4308 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x9e/0x140 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x14f/0x170 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x23/0x80 mm/kasan/common.c:322 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slub.c:3940 [inline] slab_alloc_node mm/slub.c:4002 [inline] kmalloc_trace_noprof+0x132/0x2c0 mm/slub.c:4149 kmalloc_noprof include/linux/slab.h:660 [inline] cgroup_show_path+0xaa/0x550 kernel/cgroup/cgroup.c:1900 show_mountinfo+0x206/0xb70 fs/proc_namespace.c:145 seq_read_iter+0x957/0xd60 fs/seq_file.c:272 copy_splice_read+0x662/0xb60 fs/splice.c:365 do_splice_read fs/splice.c:985 [inline] splice_direct_to_actor+0x4b7/0xc90 fs/splice.c:1089 do_splice_direct_actor fs/splice.c:1207 [inline] do_splice_direct+0x28c/0x3e0 fs/splice.c:1233 do_sendfile+0x56d/0xe20 fs/read_write.c:1295 __do_sys_sendfile64 fs/read_write.c:1362 [inline] __se_sys_sendfile64+0x17c/0x1e0 fs/read_write.c:1348 Memory state around the buggy address: ffff88807b398800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88807b398880: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc >ffff88807b398900: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00 ^ ffff88807b398980: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88807b398a00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================