loop5: detected capacity change from 0 to 32768 ================================================================== BUG: KASAN: slab-use-after-free in dbAllocBits+0x623/0x630 fs/jfs/jfs_dmap.c:2238 Read of size 8 at addr ffff88808601f6b8 by task syz-executor.5/11744 CPU: 0 PID: 11744 Comm: syz-executor.5 Not tainted 6.4.0-rc4-syzkaller-00198-g9e87b63ed37e #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/25/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106 print_address_description.constprop.0+0x2c/0x3c0 mm/kasan/report.c:351 print_report mm/kasan/report.c:462 [inline] kasan_report+0x11c/0x130 mm/kasan/report.c:572 dbAllocBits+0x623/0x630 fs/jfs/jfs_dmap.c:2238 dbAllocDmap+0x61/0x110 fs/jfs/jfs_dmap.c:2015 dbAllocNear fs/jfs/jfs_dmap.c:1244 [inline] dbAlloc+0x78e/0xab0 fs/jfs/jfs_dmap.c:829 extBalloc fs/jfs/jfs_extent.c:321 [inline] extAlloc+0x4eb/0xeb0 fs/jfs/jfs_extent.c:122 jfs_get_block+0x665/0xa90 fs/jfs/inode.c:248 __block_write_begin_int+0x3bd/0x14b0 fs/buffer.c:2064 __block_write_begin fs/buffer.c:2114 [inline] block_write_begin+0xb9/0x4d0 fs/buffer.c:2175 jfs_write_begin+0x31/0xd0 fs/jfs/inode.c:299 generic_perform_write+0x256/0x570 mm/filemap.c:3923 __generic_file_write_iter+0x2ae/0x500 mm/filemap.c:4051 generic_file_write_iter+0xe3/0x350 mm/filemap.c:4083 call_write_iter include/linux/fs.h:1868 [inline] do_iter_readv_writev+0x20b/0x3b0 fs/read_write.c:735 do_iter_write+0x185/0x7e0 fs/read_write.c:860 vfs_iter_write+0x74/0xa0 fs/read_write.c:901 iter_file_splice_write+0x743/0xc80 fs/splice.c:795 do_splice_from fs/splice.c:873 [inline] direct_splice_actor+0x114/0x180 fs/splice.c:1039 splice_direct_to_actor+0x335/0x8a0 fs/splice.c:994 do_splice_direct+0x1ab/0x280 fs/splice.c:1082 do_sendfile+0xb19/0x12c0 fs/read_write.c:1254 __do_sys_sendfile64 fs/read_write.c:1322 [inline] __se_sys_sendfile64 fs/read_write.c:1308 [inline] __x64_sys_sendfile64+0x1d0/0x210 fs/read_write.c:1308 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f0a9cc8c169 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f0a9d918168 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007f0a9cdabf80 RCX: 00007f0a9cc8c169 RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000004 RBP: 00007f0a9cce7ca1 R08: 0000000000000000 R09: 0000000000000000 R10: 000080001d00c0d0 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc92d4fb7f R14: 00007f0a9d918300 R15: 0000000000022000 Allocated by task 11726: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:374 [inline] ____kasan_kmalloc mm/kasan/common.c:333 [inline] __kasan_kmalloc+0xa2/0xb0 mm/kasan/common.c:383 kmalloc include/linux/slab.h:559 [inline] dbMount+0x50/0xa10 fs/jfs/jfs_dmap.c:164 jfs_mount+0x289/0x8b0 fs/jfs/jfs_mount.c:121 jfs_fill_super+0x5a8/0xd40 fs/jfs/super.c:556 mount_bdev+0x358/0x420 fs/super.c:1380 legacy_get_tree+0x109/0x220 fs/fs_context.c:610 vfs_get_tree+0x8d/0x350 fs/super.c:1510 do_new_mount fs/namespace.c:3039 [inline] path_mount+0x134b/0x1e40 fs/namespace.c:3369 do_mount fs/namespace.c:3382 [inline] __do_sys_mount fs/namespace.c:3591 [inline] __se_sys_mount fs/namespace.c:3568 [inline] __x64_sys_mount+0x283/0x300 fs/namespace.c:3568 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Freed by task 5037: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 kasan_save_free_info+0x2e/0x40 mm/kasan/generic.c:521 ____kasan_slab_free mm/kasan/common.c:236 [inline] ____kasan_slab_free+0x160/0x1c0 mm/kasan/common.c:200 kasan_slab_free include/linux/kasan.h:162 [inline] slab_free_hook mm/slub.c:1781 [inline] slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1807 slab_free mm/slub.c:3786 [inline] __kmem_cache_free+0xaf/0x2d0 mm/slub.c:3799 dbUnmount+0x103/0x140 fs/jfs/jfs_dmap.c:265 jfs_umount+0x247/0x430 fs/jfs/jfs_umount.c:87 jfs_put_super+0x85/0x1d0 fs/jfs/super.c:194 generic_shutdown_super+0x158/0x480 fs/super.c:500 kill_block_super+0xa1/0x100 fs/super.c:1407 deactivate_locked_super+0x98/0x160 fs/super.c:331 deactivate_super+0xb1/0xd0 fs/super.c:362 cleanup_mnt+0x2ae/0x3d0 fs/namespace.c:1177 task_work_run+0x16f/0x270 kernel/task_work.c:179 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop kernel/entry/common.c:171 [inline] exit_to_user_mode_prepare+0x210/0x240 kernel/entry/common.c:204 __syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline] syscall_exit_to_user_mode+0x1d/0x50 kernel/entry/common.c:297 do_syscall_64+0x46/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd The buggy address belongs to the object at ffff88808601f000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1720 bytes inside of freed 2048-byte region [ffff88808601f000, ffff88808601f800) The buggy address belongs to the physical page: page:ffffea0002180600 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x86018 head:ffffea0002180600 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000010200 ffff888012442000 ffffea0001eef200 dead000000000002 raw: 0000000000000000 0000000080080008 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 5032, tgid 5032 (syz-executor.0), ts 248605787649, free_ts 0 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x2db/0x350 mm/page_alloc.c:1731 prep_new_page mm/page_alloc.c:1738 [inline] get_page_from_freelist+0xf41/0x2c00 mm/page_alloc.c:3502 __alloc_pages+0x1cb/0x4a0 mm/page_alloc.c:4768 alloc_pages+0x1aa/0x270 mm/mempolicy.c:2279 alloc_slab_page mm/slub.c:1851 [inline] allocate_slab+0x25f/0x390 mm/slub.c:1998 new_slab mm/slub.c:2051 [inline] ___slab_alloc+0xa91/0x1400 mm/slub.c:3192 __slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3291 __slab_alloc_node mm/slub.c:3344 [inline] slab_alloc_node mm/slub.c:3441 [inline] __kmem_cache_alloc_node+0x136/0x320 mm/slub.c:3490 kmalloc_trace+0x26/0xe0 mm/slab_common.c:1057 kmalloc include/linux/slab.h:559 [inline] kzalloc include/linux/slab.h:680 [inline] device_create_groups_vargs+0x8a/0x280 drivers/base/core.c:4284 device_create+0xe3/0x120 drivers/base/core.c:4341 mac80211_hwsim_new_radio+0x37d/0x4c10 drivers/net/wireless/virtual/mac80211_hwsim.c:4980 hwsim_new_radio_nl+0xacf/0x1210 drivers/net/wireless/virtual/mac80211_hwsim.c:5974 genl_family_rcv_msg_doit.isra.0+0x1e6/0x2d0 net/netlink/genetlink.c:968 genl_family_rcv_msg net/netlink/genetlink.c:1048 [inline] genl_rcv_msg+0x4ff/0x7e0 net/netlink/genetlink.c:1065 netlink_rcv_skb+0x165/0x440 net/netlink/af_netlink.c:2546 page_owner free stack trace missing Memory state around the buggy address: ffff88808601f580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88808601f600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88808601f680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88808601f700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88808601f780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================