================================================================== BUG: KASAN: slab-use-after-free in ext4_ext_binsearch fs/ext4/extents.c:837 [inline] BUG: KASAN: slab-use-after-free in ext4_find_extent+0xbc8/0xde0 fs/ext4/extents.c:953 Read of size 4 at addr ffff88807ecad39c by task syz-executor.5/20192 CPU: 0 PID: 20192 Comm: syz-executor.5 Not tainted 6.7.0-rc4-syzkaller-00384-gb10a3ccaf6e3 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:364 [inline] print_report+0x163/0x540 mm/kasan/report.c:475 kasan_report+0x142/0x170 mm/kasan/report.c:588 ext4_ext_binsearch fs/ext4/extents.c:837 [inline] ext4_find_extent+0xbc8/0xde0 fs/ext4/extents.c:953 ext4_ext_map_blocks+0x2cb/0x7150 fs/ext4/extents.c:4101 ext4_map_blocks+0x405/0x1cd0 fs/ext4/inode.c:548 _ext4_get_block+0x238/0x6a0 fs/ext4/inode.c:763 ext4_block_write_begin+0x537/0x1850 fs/ext4/inode.c:1053 ext4_write_begin+0x619/0x10b0 ext4_da_write_begin+0x300/0xa50 fs/ext4/inode.c:2875 generic_perform_write+0x31b/0x630 mm/filemap.c:3918 ext4_buffered_write_iter+0xc6/0x350 fs/ext4/file.c:299 ext4_file_write_iter+0x1dc/0x19b0 call_write_iter include/linux/fs.h:2020 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x792/0xb20 fs/read_write.c:584 ksys_write+0x1a0/0x2c0 fs/read_write.c:637 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x45/0x110 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b RIP: 0033:0x7fec5e87cba9 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:00007fec5d3bc0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fec5e99c120 RCX: 00007fec5e87cba9 RDX: 000000000000fea7 RSI: 0000000020000080 RDI: 0000000000000007 RBP: 00007fec5e8c847a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000006e R14: 00007fec5e99c120 R15: 00007ffe2ac0c538 Allocated by task 2979: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4f/0x70 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:374 [inline] __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:383 kasan_kmalloc include/linux/kasan.h:198 [inline] __do_kmalloc_node mm/slab_common.c:1007 [inline] __kmalloc+0xb3/0x1a0 mm/slab_common.c:1020 kmalloc include/linux/slab.h:604 [inline] kzalloc include/linux/slab.h:721 [inline] ieee802_11_parse_elems_full+0xe7/0x2470 net/mac80211/util.c:1628 ieee802_11_parse_elems_crc net/mac80211/ieee80211_i.h:2288 [inline] ieee802_11_parse_elems net/mac80211/ieee80211_i.h:2295 [inline] ieee80211_rx_mgmt_probe_beacon net/mac80211/ibss.c:1573 [inline] ieee80211_ibss_rx_queued_mgmt+0x4b3/0x2d30 net/mac80211/ibss.c:1604 ieee80211_iface_process_skb net/mac80211/iface.c:1589 [inline] ieee80211_iface_work+0x805/0xd90 net/mac80211/iface.c:1643 cfg80211_wiphy_work+0x21e/0x250 net/wireless/core.c:437 process_one_work kernel/workqueue.c:2627 [inline] process_scheduled_works+0x90f/0x1420 kernel/workqueue.c:2700 worker_thread+0xa5f/0x1000 kernel/workqueue.c:2781 kthread+0x2d3/0x370 kernel/kthread.c:388 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242 Freed by task 2979: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4f/0x70 mm/kasan/common.c:52 kasan_save_free_info+0x28/0x40 mm/kasan/generic.c:522 ____kasan_slab_free+0xd6/0x120 mm/kasan/common.c:236 kasan_slab_free include/linux/kasan.h:164 [inline] slab_free_hook mm/slub.c:1800 [inline] slab_free_freelist_hook mm/slub.c:1826 [inline] slab_free mm/slub.c:3809 [inline] __kmem_cache_free+0x263/0x3a0 mm/slub.c:3822 ieee80211_rx_mgmt_probe_beacon net/mac80211/ibss.c:1578 [inline] ieee80211_ibss_rx_queued_mgmt+0x1ad9/0x2d30 net/mac80211/ibss.c:1604 ieee80211_iface_process_skb net/mac80211/iface.c:1589 [inline] ieee80211_iface_work+0x805/0xd90 net/mac80211/iface.c:1643 cfg80211_wiphy_work+0x21e/0x250 net/wireless/core.c:437 process_one_work kernel/workqueue.c:2627 [inline] process_scheduled_works+0x90f/0x1420 kernel/workqueue.c:2700 worker_thread+0xa5f/0x1000 kernel/workqueue.c:2781 kthread+0x2d3/0x370 kernel/kthread.c:388 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242 Last potentially related work creation: kasan_save_stack+0x3f/0x60 mm/kasan/common.c:45 __kasan_record_aux_stack+0xad/0xc0 mm/kasan/generic.c:492 insert_work+0x3e/0x330 kernel/workqueue.c:1647 __queue_work+0xbf4/0x1000 kernel/workqueue.c:1796 queue_work_on+0x14f/0x250 kernel/workqueue.c:1831 req_bio_endio block/blk-mq.c:788 [inline] blk_update_request+0x53f/0x1020 block/blk-mq.c:933 blk_mq_end_request+0x3e/0x70 block/blk-mq.c:1056 blk_flush_complete_seq+0x603/0xd20 block/blk-flush.c:206 flush_end_io+0x7de/0xa30 block/blk-flush.c:264 __blk_mq_end_request+0x2be/0x3b0 block/blk-mq.c:1046 blk_complete_reqs block/blk-mq.c:1131 [inline] blk_done_softirq+0x103/0x150 block/blk-mq.c:1136 __do_softirq+0x2b8/0x939 kernel/softirq.c:553 Second to last potentially related work creation: kasan_save_stack+0x3f/0x60 mm/kasan/common.c:45 __kasan_record_aux_stack+0xad/0xc0 mm/kasan/generic.c:492 kvfree_call_rcu+0xfc/0x790 kernel/rcu/tree.c:3400 fuse_dev_free+0x159/0x190 fs/fuse/inode.c:1414 fuse_dev_release+0x56d/0x5d0 fs/fuse/dev.c:2220 __fput+0x3cc/0xa10 fs/file_table.c:394 task_work_run+0x24a/0x300 kernel/task_work.c:180 exit_task_work include/linux/task_work.h:38 [inline] do_exit+0xa34/0x2750 kernel/exit.c:871 do_group_exit+0x206/0x2c0 kernel/exit.c:1021 get_signal+0x1769/0x1840 kernel/signal.c:2904 arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:309 exit_to_user_mode_loop+0x6a/0x100 kernel/entry/common.c:168 exit_to_user_mode_prepare+0xb1/0x150 kernel/entry/common.c:204 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline] syscall_exit_to_user_mode+0x69/0x2a0 kernel/entry/common.c:296 do_syscall_64+0x52/0x110 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x63/0x6b The buggy address belongs to the object at ffff88807ecad000 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 924 bytes inside of freed 1024-byte region [ffff88807ecad000, ffff88807ecad400) The buggy address belongs to the physical page: page:ffffea0001fb2a00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7eca8 head:ffffea0001fb2a00 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000840(slab|head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000840 ffff888012c41dc0 ffffea0001941c00 dead000000000002 raw: 0000000000000000 0000000000100010 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 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5185, tgid 5185 (kworker/u4:5), ts 197231151301, free_ts 197180891252 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x1e6/0x210 mm/page_alloc.c:1537 prep_new_page mm/page_alloc.c:1544 [inline] get_page_from_freelist+0x33ea/0x3570 mm/page_alloc.c:3312 __alloc_pages+0x255/0x680 mm/page_alloc.c:4568 alloc_pages_mpol+0x3de/0x640 mm/mempolicy.c:2133 alloc_slab_page+0x6a/0x170 mm/slub.c:1870 allocate_slab mm/slub.c:2017 [inline] new_slab+0x84/0x2f0 mm/slub.c:2070 ___slab_alloc+0xc8a/0x1330 mm/slub.c:3223 __slab_alloc mm/slub.c:3322 [inline] __slab_alloc_node mm/slub.c:3375 [inline] slab_alloc_node mm/slub.c:3468 [inline] __kmem_cache_alloc_node+0x21d/0x300 mm/slub.c:3517 __do_kmalloc_node mm/slab_common.c:1006 [inline] __kmalloc+0xa2/0x1a0 mm/slab_common.c:1020 kmalloc include/linux/slab.h:604 [inline] load_elf_phdrs fs/binfmt_elf.c:526 [inline] load_elf_binary+0x2ed/0x2590 fs/binfmt_elf.c:855 search_binary_handler fs/exec.c:1737 [inline] exec_binprm fs/exec.c:1779 [inline] bprm_execve+0xa0f/0x18a0 fs/exec.c:1854 kernel_execve+0x8ec/0xa20 fs/exec.c:2022 call_usermodehelper_exec_async+0x233/0x370 kernel/umh.c:110 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1137 [inline] free_unref_page_prepare+0x931/0xa60 mm/page_alloc.c:2347 free_unref_page+0x37/0x3f0 mm/page_alloc.c:2487 discard_slab mm/slub.c:2116 [inline] __unfreeze_partials+0x1e0/0x220 mm/slub.c:2655 put_cpu_partial+0x17b/0x250 mm/slub.c:2731 __slab_free+0x2b6/0x390 mm/slub.c:3679 qlink_free mm/kasan/quarantine.c:168 [inline] qlist_free_all+0x75/0xe0 mm/kasan/quarantine.c:187 kasan_quarantine_reduce+0x14b/0x160 mm/kasan/quarantine.c:294 __kasan_slab_alloc+0x23/0x70 mm/kasan/common.c:305 kasan_slab_alloc include/linux/kasan.h:188 [inline] slab_post_alloc_hook+0x6c/0x3c0 mm/slab.h:763 slab_alloc_node mm/slub.c:3478 [inline] __kmem_cache_alloc_node+0x1d0/0x300 mm/slub.c:3517 kmalloc_trace+0x2a/0x60 mm/slab_common.c:1098 kmalloc include/linux/slab.h:600 [inline] kzalloc include/linux/slab.h:721 [inline] mca_alloc net/ipv6/mcast.c:880 [inline] __ipv6_dev_mc_inc+0x426/0xa90 net/ipv6/mcast.c:936 addrconf_join_solict net/ipv6/addrconf.c:2200 [inline] addrconf_dad_begin net/ipv6/addrconf.c:4045 [inline] addrconf_dad_work+0x448/0x16e0 net/ipv6/addrconf.c:4170 process_one_work kernel/workqueue.c:2627 [inline] process_scheduled_works+0x90f/0x1420 kernel/workqueue.c:2700 worker_thread+0xa5f/0x1000 kernel/workqueue.c:2781 kthread+0x2d3/0x370 kernel/kthread.c:388 Memory state around the buggy address: ffff88807ecad280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88807ecad300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88807ecad380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88807ecad400: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88807ecad480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================