================================================================== BUG: KASAN: slab-out-of-bounds in addressPXD fs/jfs/jfs_types.h:80 [inline] BUG: KASAN: slab-out-of-bounds in dtSearch+0x1906/0x1f60 fs/jfs/jfs_dtree.c:785 Read of size 4 at addr ffff88807d209fe0 by task syz.7.1665/9220 CPU: 1 PID: 9220 Comm: syz.7.1665 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Call Trace: dump_stack_lvl+0x188/0x24e lib/dump_stack.c:106 print_address_description mm/kasan/report.c:316 [inline] print_report+0xa8/0x210 mm/kasan/report.c:420 kasan_report+0x10b/0x140 mm/kasan/report.c:524 addressPXD fs/jfs/jfs_types.h:80 [inline] dtSearch+0x1906/0x1f60 fs/jfs/jfs_dtree.c:785 jfs_lookup+0x1ad/0x420 fs/jfs/namei.c:1461 lookup_one_qstr_excl+0x10e/0x240 fs/namei.c:1613 filename_create+0x242/0x450 fs/namei.c:3928 do_mkdirat+0xa5/0x440 fs/namei.c:4172 __do_sys_mkdirat fs/namei.c:4197 [inline] __se_sys_mkdirat fs/namei.c:4195 [inline] __x64_sys_mkdirat+0x85/0x90 fs/namei.c:4195 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f526699d007 Code: 00 66 90 48 89 f2 b9 00 01 00 00 48 89 fe bf 9c ff ff ff e9 db f7 ff ff 66 2e 0f 1f 84 00 00 00 00 00 90 b8 02 01 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f5267906e58 EFLAGS: 00000246 ORIG_RAX: 0000000000000102 RAX: ffffffffffffffda RBX: 00007f5267906ee0 RCX: 00007f526699d007 RDX: 00000000000001ff RSI: 0000200000000040 RDI: 00000000ffffff9c RBP: 0000200000000140 R08: 00002000000000c0 R09: 0000000000000000 R10: 0000200000000140 R11: 0000000000000246 R12: 0000200000000040 R13: 00007f5267906ea0 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 9138: kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:53 __kasan_slab_alloc+0x6b/0x80 mm/kasan/common.c:329 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook+0x4b/0x490 mm/slab.h:737 kmem_cache_alloc_bulk+0x3ba/0x4e0 mm/slub.c:3880 mt_alloc_bulk lib/maple_tree.c:159 [inline] mas_alloc_nodes+0x449/0x880 lib/maple_tree.c:1301 mas_node_count_gfp lib/maple_tree.c:1361 [inline] mas_preallocate+0x162/0x3b0 lib/maple_tree.c:5809 __mmap_region mm/mmap.c:2765 [inline] mmap_region+0xdcb/0x1c50 mm/mmap.c:2916 do_mmap+0x9ce/0x10d0 mm/mmap.c:1436 vm_mmap_pgoff+0x1c1/0x2d0 mm/util.c:520 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 Freed by task 9138: kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:53 kasan_save_free_info+0x27/0x40 mm/kasan/generic.c:516 ____kasan_slab_free+0x126/0x1f0 mm/kasan/common.c:237 kasan_slab_free include/linux/kasan.h:177 [inline] slab_free_hook mm/slub.c:1729 [inline] slab_free_freelist_hook+0x133/0x1b0 mm/slub.c:1755 slab_free mm/slub.c:3687 [inline] kmem_cache_free+0xf7/0x2a0 mm/slub.c:3709 mas_destroy+0x2542/0x2d40 lib/maple_tree.c:5867 mas_store_prealloc+0x32c/0x430 lib/maple_tree.c:5792 __mmap_region mm/mmap.c:2831 [inline] mmap_region+0x1420/0x1c50 mm/mmap.c:2916 do_mmap+0x9ce/0x10d0 mm/mmap.c:1436 vm_mmap_pgoff+0x1c1/0x2d0 mm/util.c:520 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 The buggy address belongs to the object at ffff88807d209e00 which belongs to the cache maple_node of size 256 The buggy address is located 224 bytes to the right of 256-byte region [ffff88807d209e00, ffff88807d209f00) The buggy address belongs to the physical page: page:ffffea0001f48200 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7d208 head:ffffea0001f48200 order:1 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 dead000000000100 dead000000000122 ffff8880174c5000 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 1, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 7829, tgid 7829 (cmp), ts 227124732026, free_ts 224101264133 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x173/0x1a0 mm/page_alloc.c:2560 prep_new_page mm/page_alloc.c:2567 [inline] get_page_from_freelist+0x206b/0x2180 mm/page_alloc.c:4358 __alloc_pages+0x1ec/0x4f0 mm/page_alloc.c:5658 alloc_slab_page+0x5d/0x180 mm/slub.c:1799 allocate_slab mm/slub.c:1944 [inline] new_slab+0x87/0x2d0 mm/slub.c:1997 ___slab_alloc+0xbc5/0x1240 mm/slub.c:3154 kmem_cache_alloc_bulk+0x1a3/0x4e0 mm/slub.c:3856 mt_alloc_bulk lib/maple_tree.c:159 [inline] mas_alloc_nodes+0x449/0x880 lib/maple_tree.c:1301 mas_node_count_gfp lib/maple_tree.c:1361 [inline] mas_preallocate+0x162/0x3b0 lib/maple_tree.c:5809 __vma_adjust+0x2ff/0x1d00 mm/mmap.c:724 vma_adjust include/linux/mm.h:2810 [inline] __split_vma+0x3a2/0x4f0 mm/mmap.c:-1 mprotect_fixup+0x5dc/0x840 mm/mprotect.c:623 do_mprotect_pkey+0x7ff/0xba0 mm/mprotect.c:792 __do_sys_mprotect mm/mprotect.c:819 [inline] __se_sys_mprotect mm/mprotect.c:816 [inline] __x64_sys_mprotect+0x7c/0x90 mm/mprotect.c:816 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1487 [inline] free_pcp_prepare mm/page_alloc.c:1537 [inline] free_unref_page_prepare+0x8e5/0x9e0 mm/page_alloc.c:3414 free_unref_page+0x2e/0x3f0 mm/page_alloc.c:3509 qlink_free mm/kasan/quarantine.c:168 [inline] qlist_free_all+0x76/0xe0 mm/kasan/quarantine.c:187 kasan_quarantine_reduce+0x144/0x160 mm/kasan/quarantine.c:294 __kasan_slab_alloc+0x1e/0x80 mm/kasan/common.c:306 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook+0x4b/0x490 mm/slab.h:737 slab_alloc_node mm/slub.c:3359 [inline] __kmem_cache_alloc_node+0x19d/0x270 mm/slub.c:3398 __do_kmalloc_node mm/slab_common.c:935 [inline] __kmalloc+0xa3/0x240 mm/slab_common.c:949 kmalloc include/linux/slab.h:568 [inline] kzalloc include/linux/slab.h:699 [inline] tomoyo_encode2 security/tomoyo/realpath.c:45 [inline] tomoyo_encode+0x28a/0x550 security/tomoyo/realpath.c:80 tomoyo_path_perm+0x382/0x610 security/tomoyo/file.c:831 tomoyo_path_symlink+0xa8/0xf0 security/tomoyo/tomoyo.c:199 security_path_symlink+0xdc/0x130 security/security.c:1202 do_symlinkat+0x10c/0x400 fs/namei.c:4546 __do_sys_symlink fs/namei.c:4573 [inline] __se_sys_symlink fs/namei.c:4571 [inline] __x64_sys_symlink+0x7a/0x90 fs/namei.c:4571 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 Memory state around the buggy address: ffff88807d209e80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88807d209f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88807d209f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff88807d20a000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88807d20a080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================