KASAN: use-after-free Read in __ext4_check_dir

Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KASAN: use-after-free Read in __ext4_check_dir_entry (3) ext4	C	inconclusive		6	33d	186d	0/28	upstream: reported C repro on 2024/10/06 17:11
linux-4.14	KASAN: use-after-free Read in __ext4_check_dir_entry	C		inconclusive	6	1660d	1763d	0/1	upstream: reported C repro on 2020/06/12 02:23
upstream	KASAN: use-after-free Read in __ext4_check_dir_entry (2) ext4	C	error		1	321d	331d	0/28	closed as dup on 2024/06/26 08:39
android-5-15	KASAN: use-after-free Read in __ext4_check_dir_entry (2) origin:lts	C			2	1d04h	1d06h	0/2	upstream: reported C repro on 2025/04/09 15:24
linux-5.15	KASAN: use-after-free Read in __ext4_check_dir_entry origin:upstream	C		error	10	52d	311d	0/3	upstream: reported C repro on 2024/06/03 01:15
android-5-15	KASAN: use-after-free Read in __ext4_check_dir_entry missing-backport origin:upstream	C		error	4	162d	286d	0/2	auto-obsoleted due to no activity on 2025/02/07 07:57
upstream	KASAN: use-after-free Read in __ext4_check_dir_entry ext4	C			8	2564d	2567d	22/28	closed as dup on 2018/03/31 22:38
android-5-10	KASAN: use-after-free Read in __ext4_check_dir_entry	C		error	2	217d	335d	0/2	auto-obsoleted due to no activity on 2024/12/26 18:56
android-6-1	KASAN: use-after-free Read in __ext4_check_dir_entry missing-backport origin:upstream	C		error	4	210d	334d	0/2	auto-obsoleted due to no activity on 2024/12/21 14:06
linux-6.1	KASAN: use-after-free Read in __ext4_check_dir_entry				15	275d	311d	0/3	auto-obsoleted due to no activity on 2024/09/17 20:54
android-6-1	KASAN: use-after-free Read in __ext4_check_dir_entry (2) origin:lts	C			2	5d07h	5d08h	0/2	upstream: reported C repro on 2025/04/05 13:22

Created	Duration	User	Repo	Result
2025/03/29 10:25	14m	retest repro	android13-5.10-lts	report log
2025/02/02 22:29	6m	retest repro	android13-5.10-lts	report log
2025/02/02 22:29	6m	retest repro	android13-5.10-lts	report log

Created

Duration

User

Patch

Repo

Result

2025/03/29 10:25

14m

retest repro

android13-5.10-lts

report log

2025/02/02 22:29

retest repro

android13-5.10-lts

report log

2025/02/02 22:29

retest repro

android13-5.10-lts

report log

Created	Duration	User	Patch	Repo	Result
2025/03/05 14:18	1h47m	bisect fix		android13-5.10-lts	OK (0) job log log

Created

Duration

User

Patch

Repo

Result

2025/03/05 14:18

1h47m

bisect fix

android13-5.10-lts

OK (0) job log log

================================================================== BUG: KASAN: use-after-free in __ext4_check_dir_entry+0x700/0x880 fs/ext4/dir.c:85 Read of size 2 at addr ffff88811362f003 by task syz-executor262/287 CPU: 0 PID: 287 Comm: syz-executor262 Not tainted 5.10.234-syzkaller-00033-g094fc3778d6b #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack_lvl+0x1e2/0x24b lib/dump_stack.c:118 print_address_description+0x81/0x3b0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:435 [inline] kasan_report+0x179/0x1c0 mm/kasan/report.c:452 __asan_report_load2_noabort+0x14/0x20 mm/kasan/report_generic.c:307 __ext4_check_dir_entry+0x700/0x880 fs/ext4/dir.c:85 ext4_readdir+0x1402/0x37c0 fs/ext4/dir.c:258 iterate_dir+0x265/0x580 fs/readdir.c:-1 __do_sys_getdents64 fs/readdir.c:369 [inline] __se_sys_getdents64+0x1c1/0x460 fs/readdir.c:354 __x64_sys_getdents64+0x7b/0x90 fs/readdir.c:354 do_syscall_64+0x34/0x70 arch/x86/entry/common.c:-1 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7f7d62370899 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 61 17 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:00007ffe345955d8 EFLAGS: 00000246 ORIG_RAX: 00000000000000d9 RAX: ffffffffffffffda RBX: 626b5f657a69735f RCX: 00007f7d62370899 RDX: 0000000000000010 RSI: 0000000000000000 RDI: 0000000000000006 RBP: 00007ffe345955e8 R08: 6c616b7a79732f2e R09: 6c616b7a79732f2e R10: 6c616b7a79732f2e R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe34595848 R14: 0000000000000001 R15: 0000000000000001 The buggy address belongs to the page: page:ffffea00044d8bc0 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x11362f flags: 0x4000000000000000() raw: 4000000000000000 ffffea00047f8308 ffff8881f705ab70 0000000000000000 raw: 0000000000000001 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as freed page last allocated via order 0, migratetype Movable, gfp_mask 0x8100dca(GFP_HIGHUSER_MOVABLE|__GFP_ZERO|0x8000000), pid 272, ts 21621670164, free_ts 21655213079 set_page_owner include/linux/page_owner.h:35 [inline] post_alloc_hook mm/page_alloc.c:2456 [inline] prep_new_page+0x166/0x180 mm/page_alloc.c:2462 get_page_from_freelist+0x2d8c/0x2f30 mm/page_alloc.c:4254 __alloc_pages_nodemask+0x435/0xaf0 mm/page_alloc.c:5348 __alloc_pages include/linux/gfp.h:544 [inline] __alloc_pages_node include/linux/gfp.h:557 [inline] alloc_pages_node include/linux/gfp.h:571 [inline] alloc_pages include/linux/gfp.h:590 [inline] do_anonymous_page mm/memory.c:3963 [inline] handle_pte_fault+0x175a/0x3e10 mm/memory.c:4786 __handle_mm_fault mm/memory.c:4944 [inline] handle_mm_fault+0x11d6/0x1a10 mm/memory.c:5358 do_user_addr_fault arch/x86/mm/fault.c:1362 [inline] handle_page_fault arch/x86/mm/fault.c:1428 [inline] exc_page_fault+0x2a6/0x5b0 arch/x86/mm/fault.c:1484 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:571 page last free stack trace: reset_page_owner include/linux/page_owner.h:28 [inline] free_pages_prepare mm/page_alloc.c:1349 [inline] free_pcp_prepare mm/page_alloc.c:1421 [inline] free_unref_page_prepare+0x2ae/0x2d0 mm/page_alloc.c:3336 free_unref_page_list+0x122/0xb20 mm/page_alloc.c:3443 release_pages+0xea0/0xef0 mm/swap.c:1103 free_pages_and_swap_cache+0x8a/0xa0 mm/swap_state.c:356 tlb_batch_pages_flush mm/mmu_gather.c:49 [inline] tlb_flush_mmu_free mm/mmu_gather.c:240 [inline] tlb_flush_mmu mm/mmu_gather.c:247 [inline] tlb_finish_mmu+0x177/0x320 mm/mmu_gather.c:326 unmap_region+0x31c/0x370 mm/mmap.c:2799 __do_munmap+0x699/0x8c0 mm/mmap.c:3029 __vm_munmap mm/mmap.c:3082 [inline] __do_sys_munmap mm/mmap.c:3108 [inline] __se_sys_munmap+0x120/0x1a0 mm/mmap.c:3104 __x64_sys_munmap+0x5b/0x70 mm/mmap.c:3104 do_syscall_64+0x34/0x70 arch/x86/entry/common.c:-1 entry_SYSCALL_64_after_hwframe+0x61/0xcb Memory state around the buggy address: ffff88811362ef00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88811362ef80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88811362f000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff88811362f080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff88811362f100: ff ff ff ff ff

Crashes (5):
Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	Assets (help?)	Manager	Title
2025/04/02 14:12	android13-5.10-lts	094fc3778d6b	c799dfdd	.config	console log	report	syz / log	C	[disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)]	ci2-android-5-10	KASAN: use-after-free Read in __ext4_check_dir_entry
2025/04/02 07:54	android13-5.10-lts	094fc3778d6b	c799dfdd	.config	strace log	report	syz / log	C	[disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)]	ci2-android-5-10	KASAN: use-after-free Read in __ext4_check_dir_entry
2025/03/15 02:34	android13-5.10-lts	fc9aa81462ee	e2826670	.config	strace log	report	syz / log	C	[disk image] [vmlinux] [kernel image] [mounted in repro (clean fs)]	ci2-android-5-10	KASAN: use-after-free Read in __ext4_check_dir_entry
2025/01/19 17:50	android13-5.10-lts	fbe98d68b6b3	f2cb035c	.config	strace log	report	syz / log	C	[disk image] [vmlinux] [kernel image] [mounted in repro]	ci2-android-5-10	KASAN: use-after-free Read in __ext4_check_dir_entry
2025/01/19 16:50	android13-5.10-lts	fbe98d68b6b3	f2cb035c	.config	strace log	report	syz / log	C	[disk image] [vmlinux] [kernel image] [mounted in repro]	ci2-android-5-10	KASAN: use-after-free Read in __ext4_check_dir_entry

Crashes (5):

Assets (help?)