================================================================== BUG: KASAN: slab-out-of-bounds in udf_write_aext+0x5e9/0x7a0 fs/udf/inode.c:2105 Write of size 4 at addr ffff888024adabf0 by task syz.4.702/6852 CPU: 1 PID: 6852 Comm: syz.4.702 Not tainted 6.1.112-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106 print_address_description mm/kasan/report.c:284 [inline] print_report+0x15f/0x4f0 mm/kasan/report.c:395 kasan_report+0x136/0x160 mm/kasan/report.c:495 udf_write_aext+0x5e9/0x7a0 fs/udf/inode.c:2105 udf_add_entry+0x17b7/0x3350 fs/udf/namei.c:482 udf_mkdir+0x1a8/0xaa0 fs/udf/namei.c:681 vfs_mkdir+0x3b6/0x590 fs/namei.c:4108 do_mkdirat+0x225/0x360 fs/namei.c:4133 __do_sys_mkdirat fs/namei.c:4148 [inline] __se_sys_mkdirat fs/namei.c:4146 [inline] __x64_sys_mkdirat+0x85/0x90 fs/namei.c:4146 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f1efbd7dff9 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:00007f1efcc11038 EFLAGS: 00000246 ORIG_RAX: 0000000000000102 RAX: ffffffffffffffda RBX: 00007f1efbf36058 RCX: 00007f1efbd7dff9 RDX: 0000000000000000 RSI: 00000000200005c0 RDI: ffffffffffffff9c RBP: 00007f1efbdf0296 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f1efbf36058 R15: 00007fff35f6d1a8 Allocated by task 3290: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:374 [inline] __kasan_kmalloc+0x97/0xb0 mm/kasan/common.c:383 kmalloc include/linux/slab.h:557 [inline] kzalloc include/linux/slab.h:693 [inline] ep_alloc fs/eventpoll.c:982 [inline] do_epoll_create+0x109/0x300 fs/eventpoll.c:2043 __do_sys_epoll_create1 fs/eventpoll.c:2074 [inline] __se_sys_epoll_create1 fs/eventpoll.c:2072 [inline] __x64_sys_epoll_create1+0x33/0x40 fs/eventpoll.c:2072 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 The buggy address belongs to the object at ffff888024ada800 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 496 bytes to the right of 512-byte region [ffff888024ada800, ffff888024adaa00) The buggy address belongs to the physical page: page:ffffea000092b600 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x24ad8 head:ffffea000092b600 order:2 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 0000000000000000 dead000000000001 ffff888017c41c80 raw: 0000000000000000 0000000080100010 00000001ffffffff 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 0xd2000(__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, tgid 1 (swapper/0), ts 8996933460, free_ts 8996038509 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x18d/0x1b0 mm/page_alloc.c:2517 prep_new_page mm/page_alloc.c:2524 [inline] get_page_from_freelist+0x322e/0x33b0 mm/page_alloc.c:4290 __alloc_pages+0x28d/0x770 mm/page_alloc.c:5558 __alloc_pages_node include/linux/gfp.h:237 [inline] alloc_slab_page+0x59/0x150 mm/slub.c:1796 allocate_slab mm/slub.c:1939 [inline] new_slab+0x84/0x2d0 mm/slub.c:1992 ___slab_alloc+0xc20/0x1270 mm/slub.c:3180 __slab_alloc mm/slub.c:3279 [inline] slab_alloc_node mm/slub.c:3364 [inline] __kmem_cache_alloc_node+0x19f/0x260 mm/slub.c:3437 __do_kmalloc_node mm/slab_common.c:935 [inline] __kmalloc_node+0xa2/0x230 mm/slab_common.c:943 kmalloc_node include/linux/slab.h:583 [inline] kzalloc_node include/linux/slab.h:704 [inline] blk_alloc_flush_queue+0xdf/0x260 block/blk-flush.c:484 blk_mq_alloc_hctx block/blk-mq.c:3744 [inline] blk_mq_alloc_and_init_hctx+0x867/0xdb0 block/blk-mq.c:4184 blk_mq_realloc_hw_ctxs+0x194/0x4a0 block/blk-mq.c:4217 blk_mq_init_allocated_queue+0x51c/0x1710 block/blk-mq.c:4279 blk_mq_init_queue_data block/blk-mq.c:4088 [inline] __blk_mq_alloc_disk+0xba/0x1e0 block/blk-mq.c:4137 null_add_dev+0x81e/0x1800 drivers/block/null_blk/main.c:2067 null_create_dev drivers/block/null_blk/main.c:2188 [inline] null_init+0x28a/0x4f0 drivers/block/null_blk/main.c:2262 do_one_initcall+0x265/0x8f0 init/main.c:1298 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1444 [inline] free_pcp_prepare mm/page_alloc.c:1494 [inline] free_unref_page_prepare+0xf63/0x1120 mm/page_alloc.c:3369 free_unref_page+0x33/0x3e0 mm/page_alloc.c:3464 __stack_depot_save+0x409/0x470 lib/stackdepot.c:506 kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x60/0x70 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:374 [inline] __kasan_kmalloc+0x97/0xb0 mm/kasan/common.c:383 kmalloc include/linux/slab.h:557 [inline] kzalloc include/linux/slab.h:693 [inline] kobject_create lib/kobject.c:760 [inline] kobject_create_and_add+0x57/0x230 lib/kobject.c:786 rnbd_clt_create_sysfs_files+0x78/0xc0 drivers/block/rnbd/rnbd-clt-sysfs.c:660 rnbd_client_init+0x37/0xdb drivers/block/rnbd/rnbd-clt.c:1821 do_one_initcall+0x265/0x8f0 init/main.c:1298 do_initcall_level+0x157/0x207 init/main.c:1371 do_initcalls+0x49/0x86 init/main.c:1387 kernel_init_freeable+0x45c/0x60f init/main.c:1626 kernel_init+0x19/0x290 init/main.c:1514 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Memory state around the buggy address: ffff888024adaa80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888024adab00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888024adab80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff888024adac00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888024adac80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================