syz.0.1 calls setitimer() with new_value NULL pointer. Misfeature support will be removed EXT4-fs (loop0): mounted filesystem without journal. Opts: ,errors=continue ================================================================== BUG: KASAN: out-of-bounds in ext4_xattr_set_entry+0x1d6d/0x36c0 fs/ext4/xattr.c:1719 Read of size 18446744073709550624 at addr ffff8881289417e0 by task syz.0.1/308 CPU: 0 PID: 308 Comm: syz.0.1 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 Call Trace: __dump_stack+0x21/0x24 lib/dump_stack.c:77 dump_stack_lvl+0x169/0x1d8 lib/dump_stack.c:118 print_address_description+0x7f/0x2c0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:435 [inline] kasan_report+0xe2/0x130 mm/kasan/report.c:452 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x280/0x290 mm/kasan/generic.c:189 memmove+0x2d/0x70 mm/kasan/shadow.c:54 ext4_xattr_set_entry+0x1d6d/0x36c0 fs/ext4/xattr.c:1719 ext4_xattr_block_set+0x4d6/0x2a50 fs/ext4/xattr.c:1927 ext4_xattr_set_handle+0xbd5/0x12a0 fs/ext4/xattr.c:2412 ext4_xattr_set+0x1ec/0x320 fs/ext4/xattr.c:2513 ext4_xattr_trusted_set+0x3b/0x50 fs/ext4/xattr_trusted.c:37 __vfs_setxattr+0x42a/0x480 fs/xattr.c:177 __vfs_setxattr_noperm+0x11e/0x4e0 fs/xattr.c:208 __vfs_setxattr_locked+0x203/0x220 fs/xattr.c:266 vfs_setxattr+0x8d/0x1c0 fs/xattr.c:283 setxattr+0x1a9/0x370 fs/xattr.c:548 path_setxattr+0x110/0x210 fs/xattr.c:567 __do_sys_lsetxattr fs/xattr.c:589 [inline] __se_sys_lsetxattr fs/xattr.c:585 [inline] __x64_sys_lsetxattr+0xc2/0xe0 fs/xattr.c:585 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7f1b3b41afc9 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:00007f1b39e83038 EFLAGS: 00000246 ORIG_RAX: 00000000000000bd RAX: ffffffffffffffda RBX: 00007f1b3b671fa0 RCX: 00007f1b3b41afc9 RDX: 0000200000000440 RSI: 00002000000000c0 RDI: 0000200000000100 RBP: 00007f1b3b49df91 R08: 0000000000000000 R09: 0000000000000000 R10: 000000000000fe37 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f1b3b672038 R14: 00007f1b3b671fa0 R15: 00007ffc7187c7c8 The buggy address belongs to the page: page:ffffea0004a25040 refcount:2 mapcount:0 mapping:ffff8881092f5390 index:0x1c pfn:0x128941 aops:def_blk_aops ino:0 flags: 0x400000000000203a(referenced|dirty|lru|active|private) raw: 400000000000203a ffffea0004a5b1c8 ffffea0004a25388 ffff8881092f5390 raw: 000000000000001c ffff88811aa43348 00000002ffffffff ffff88810d27c000 page dumped because: kasan: bad access detected page->mem_cgroup:ffff88810d27c000 page_owner tracks the page as allocated page last allocated via order 0, migratetype Movable, gfp_mask 0x108c48(GFP_NOFS|__GFP_NOFAIL|__GFP_HARDWALL|__GFP_MOVABLE), pid 308, ts 23775641859, free_ts 23771300927 set_page_owner include/linux/page_owner.h:35 [inline] post_alloc_hook mm/page_alloc.c:2456 [inline] prep_new_page+0x179/0x180 mm/page_alloc.c:2462 get_page_from_freelist+0x2235/0x23d0 mm/page_alloc.c:4254 __alloc_pages_nodemask+0x268/0x5f0 mm/page_alloc.c:5370 __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] __page_cache_alloc include/linux/pagemap.h:290 [inline] pagecache_get_page+0x642/0x930 mm/filemap.c:1848 find_or_create_page include/linux/pagemap.h:402 [inline] grow_dev_page fs/buffer.c:976 [inline] grow_buffers fs/buffer.c:1045 [inline] __getblk_slow fs/buffer.c:1072 [inline] __getblk_gfp+0x212/0x780 fs/buffer.c:1370 sb_getblk include/linux/buffer_head.h:361 [inline] ext4_xattr_block_set+0x1c06/0x2a50 fs/ext4/xattr.c:2108 ext4_xattr_set_handle+0xbd5/0x12a0 fs/ext4/xattr.c:2412 ext4_xattr_set+0x1ec/0x320 fs/ext4/xattr.c:2513 ext4_xattr_user_set+0xc9/0xf0 fs/ext4/xattr_user.c:40 __vfs_setxattr+0x42a/0x480 fs/xattr.c:177 __vfs_setxattr_noperm+0x11e/0x4e0 fs/xattr.c:208 __vfs_setxattr_locked+0x203/0x220 fs/xattr.c:266 vfs_setxattr+0x8d/0x1c0 fs/xattr.c:283 setxattr+0x1a9/0x370 fs/xattr.c:548 path_setxattr+0x110/0x210 fs/xattr.c:567 __do_sys_setxattr fs/xattr.c:582 [inline] __se_sys_setxattr fs/xattr.c:578 [inline] __x64_sys_setxattr+0xc5/0xe0 fs/xattr.c:578 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+0x2b7/0x2d0 mm/page_alloc.c:3336 free_unref_page_list+0x12e/0x9b0 mm/page_alloc.c:3443 release_pages+0xe38/0xe80 mm/swap.c:1103 free_pages_and_swap_cache+0x86/0xa0 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+0x175/0x300 mm/mmu_gather.c:326 exit_mmap+0x2fc/0x540 mm/mmap.c:3387 __mmput+0x93/0x2f0 kernel/fork.c:1153 mmput+0x4e/0x150 kernel/fork.c:1176 exit_mm kernel/exit.c:539 [inline] do_exit+0x9ae/0x2480 kernel/exit.c:859 do_group_exit+0x141/0x310 kernel/exit.c:986 get_signal+0xf7d/0x12e0 kernel/signal.c:2793 arch_do_signal_or_restart+0xbf/0x10f0 arch/x86/kernel/signal.c:805 handle_signal_work kernel/entry/common.c:145 [inline] exit_to_user_mode_loop+0xa2/0xe0 kernel/entry/common.c:169 exit_to_user_mode_prepare+0x76/0xa0 kernel/entry/common.c:199 syscall_exit_to_user_mode+0x1d/0x40 kernel/entry/common.c:274 do_syscall_64+0x3d/0x40 arch/x86/entry/common.c:56 Memory state around the buggy address: ffff888128941680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888128941700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888128941780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff888128941800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888128941880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================