KASAN: use-after-free Read in ocfs2

Kernel	Title	Rank 🛈	Repro	Cause bisect	Count	Last	Reported	Patched	Status
linux-6.1	KASAN: use-after-free Read in ocfs2_fault origin:lts-only	19	C		16	2d08h	212d	0/3	upstream: reported C repro on 2025/05/31 00:13
upstream	KASAN: slab-use-after-free Read in ocfs2_fault ocfs2	19	C	done	283	2d17h	473d	0/29	upstream: reported C repro on 2024/09/12 09:21
linux-6.6	KASAN: slab-use-after-free Read in ocfs2_fault origin:upstream missing-backport	19	C		3	4d23h	102d	0/2	upstream: reported C repro on 2025/09/17 19:37

netlink: 'syz.4.275': attribute type 2 has an invalid length. netlink: 'syz.4.275': attribute type 2 has an invalid length. ================================================================== BUG: KASAN: use-after-free in ocfs2_fault+0xc8/0x414 fs/ocfs2/mmap.c:41 Read of size 8 at addr ffff0000c1da03b8 by task syz.4.275/5117 CPU: 0 PID: 5117 Comm: syz.4.275 Not tainted 5.15.182-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025 Call trace: dump_backtrace+0x0/0x43c arch/arm64/kernel/stacktrace.c:152 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216 __dump_stack+0x30/0x40 lib/dump_stack.c:88 dump_stack_lvl+0xf8/0x160 lib/dump_stack.c:106 print_address_description+0x78/0x30c mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:434 [inline] kasan_report+0xec/0x15c mm/kasan/report.c:451 __asan_report_load8_noabort+0x44/0x50 mm/kasan/report_generic.c:309 ocfs2_fault+0xc8/0x414 fs/ocfs2/mmap.c:41 __do_fault+0x120/0x5d0 mm/memory.c:3928 do_read_fault mm/memory.c:4264 [inline] do_fault mm/memory.c:4392 [inline] handle_pte_fault mm/memory.c:4650 [inline] __handle_mm_fault mm/memory.c:4785 [inline] handle_mm_fault+0x1b4c/0x2950 mm/memory.c:4883 __do_page_fault arch/arm64/mm/fault.c:505 [inline] do_page_fault+0x694/0xad4 arch/arm64/mm/fault.c:605 do_translation_fault+0xe0/0x130 arch/arm64/mm/fault.c:686 do_mem_abort+0x6c/0x1ac arch/arm64/mm/fault.c:819 el1_abort+0x3c/0x5c arch/arm64/kernel/entry-common.c:358 el1h_64_sync_handler+0x80/0xcc arch/arm64/kernel/entry-common.c:418 el1h_64_sync+0x78/0x7c arch/arm64/kernel/entry.S:522 __arch_copy_from_user+0x84/0x218 arch/arm64/lib/copy_template.S:89 copy_msghdr_from_user net/socket.c:2369 [inline] sendmsg_copy_msghdr net/socket.c:2467 [inline] ___sys_sendmsg+0x140/0x240 net/socket.c:2486 __sys_sendmsg net/socket.c:2519 [inline] __do_sys_sendmsg net/socket.c:2528 [inline] __se_sys_sendmsg net/socket.c:2526 [inline] __arm64_sys_sendmsg+0x1a8/0x254 net/socket.c:2526 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 Allocated by task 5154: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] __kasan_slab_alloc+0x8c/0xcc mm/kasan/common.c:467 kasan_slab_alloc include/linux/kasan.h:254 [inline] slab_post_alloc_hook+0x74/0x408 mm/slab.h:519 slab_alloc_node mm/slub.c:3220 [inline] slab_alloc mm/slub.c:3228 [inline] kmem_cache_alloc+0x1e0/0x3e4 mm/slub.c:3233 vm_area_alloc+0x2c/0xe0 kernel/fork.c:350 __mmap_region mm/mmap.c:1770 [inline] mmap_region+0x99c/0x1390 mm/mmap.c:2921 do_mmap+0x67c/0xdb4 mm/mmap.c:1574 vm_mmap_pgoff+0x184/0x284 mm/util.c:551 ksys_mmap_pgoff+0x410/0x620 mm/mmap.c:1623 __do_sys_mmap arch/arm64/kernel/sys.c:28 [inline] __se_sys_mmap arch/arm64/kernel/sys.c:21 [inline] __arm64_sys_mmap+0xf8/0x110 arch/arm64/kernel/sys.c:21 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 Freed by task 5154: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4c/0x84 mm/kasan/common.c:46 kasan_set_free_info+0x28/0x4c mm/kasan/generic.c:360 ____kasan_slab_free+0x118/0x164 mm/kasan/common.c:366 __kasan_slab_free+0x18/0x28 mm/kasan/common.c:374 kasan_slab_free include/linux/kasan.h:230 [inline] slab_free_hook mm/slub.c:1705 [inline] slab_free_freelist_hook+0x128/0x1e8 mm/slub.c:1731 slab_free mm/slub.c:3499 [inline] kmem_cache_free+0xdc/0x3b4 mm/slub.c:3515 vm_area_free+0x28/0x38 kernel/fork.c:376 remove_vma mm/mmap.c:187 [inline] remove_vma_list mm/mmap.c:2616 [inline] __do_munmap+0xaa0/0xc04 mm/mmap.c:2890 do_munmap mm/mmap.c:2898 [inline] munmap_vma_range mm/mmap.c:602 [inline] __mmap_region mm/mmap.c:1745 [inline] mmap_region+0x7b0/0x1390 mm/mmap.c:2921 do_mmap+0x67c/0xdb4 mm/mmap.c:1574 vm_mmap_pgoff+0x184/0x284 mm/util.c:551 ksys_mmap_pgoff+0x410/0x620 mm/mmap.c:1623 __do_sys_mmap arch/arm64/kernel/sys.c:28 [inline] __se_sys_mmap arch/arm64/kernel/sys.c:21 [inline] __arm64_sys_mmap+0xf8/0x110 arch/arm64/kernel/sys.c:21 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 The buggy address belongs to the object at ffff0000c1da0318 which belongs to the cache vm_area_struct of size 200 The buggy address is located 160 bytes inside of 200-byte region [ffff0000c1da0318, ffff0000c1da03e0) The buggy address belongs to the page: page:000000005e52425c refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x101da0 memcg:ffff0000c9b4fe01 flags: 0x5ffc00000000200(slab|node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000000200 0000000000000000 0000000900000001 ffff0000c0841500 raw: 0000000000000000 00000000000f000f 00000001ffffffff ffff0000c9b4fe01 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000c1da0280: fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc ffff0000c1da0300: fc fc fc fa fb fb fb fb fb fb fb fb fb fb fb fb >ffff0000c1da0380: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ^ ffff0000c1da0400: fc fc fc fc fa fb fb fb fb fb fb fb fb fb fb fb ffff0000c1da0480: fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc ==================================================================

Crashes (1):
Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Assets (help?)	Manager	Title
2025/05/10 07:54	linux-5.15.y	3b8db0e4f263	77908e5f	.config	console log	report			info	[disk image] [vmlinux] [kernel image]	ci2-linux-5-15-kasan-arm64	KASAN: use-after-free Read in ocfs2_fault

Crashes (1):

Assets (help?)