loop0: detected capacity change from 0 to 1024 hfsplus: invalid length 256 has been corrected to 255 ================================================================== BUG: KASAN: slab-out-of-bounds in hfsplus_uni2asc+0x5b9/0x1240 fs/hfsplus/unicode.c:210 Read of size 2 at addr ffff88807dc77a18 by task syz.0.70/4586 CPU: 0 PID: 4586 Comm: syz.0.70 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Call Trace: dump_stack_lvl+0x168/0x230 lib/dump_stack.c:106 print_address_description+0x60/0x2d0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:434 [inline] kasan_report+0xdf/0x130 mm/kasan/report.c:451 hfsplus_uni2asc+0x5b9/0x1240 fs/hfsplus/unicode.c:210 hfsplus_listxattr+0x58b/0xb80 fs/hfsplus/xattr.c:740 vfs_listxattr fs/xattr.c:448 [inline] listxattr+0x283/0x2e0 fs/xattr.c:783 path_listxattr+0xd9/0x1b0 fs/xattr.c:807 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f3113910749 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:00007f3111b77038 EFLAGS: 00000246 ORIG_RAX: 00000000000000c2 RAX: ffffffffffffffda RBX: 00007f3113b66fa0 RCX: 00007f3113910749 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000200000000080 RBP: 00007f3113994f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f3113b67038 R14: 00007f3113b66fa0 R15: 00007ffcab93fac8 Allocated by task 4586: 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_kmalloc mm/kasan/common.c:513 [inline] __kasan_kmalloc+0xb5/0xf0 mm/kasan/common.c:522 kmalloc include/linux/slab.h:612 [inline] kzalloc include/linux/slab.h:738 [inline] hfsplus_find_init+0x85/0x1c0 fs/hfsplus/bfind.c:21 hfsplus_listxattr+0x38c/0xb80 fs/hfsplus/xattr.c:700 vfs_listxattr fs/xattr.c:448 [inline] listxattr+0x283/0x2e0 fs/xattr.c:783 path_listxattr+0xd9/0x1b0 fs/xattr.c:807 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 The buggy address belongs to the object at ffff88807dc77800 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 536 bytes inside of 1024-byte region [ffff88807dc77800, ffff88807dc77c00) The buggy address belongs to the page: page:ffffea0001f71c00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7dc70 head:ffffea0001f71c00 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 0000000000000000 0000000100000001 ffff888016841dc0 raw: 0000000000000000 0000000080100010 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 0x1d2040(__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 4340, ts 63306041406, free_ts 60609380561 prep_new_page mm/page_alloc.c:2426 [inline] get_page_from_freelist+0x1b77/0x1c60 mm/page_alloc.c:4192 __alloc_pages+0x1e1/0x470 mm/page_alloc.c:5487 alloc_slab_page mm/slub.c:1780 [inline] allocate_slab mm/slub.c:1917 [inline] new_slab+0xc0/0x4b0 mm/slub.c:1980 ___slab_alloc+0x81e/0xdf0 mm/slub.c:3013 __slab_alloc mm/slub.c:3100 [inline] slab_alloc_node mm/slub.c:3191 [inline] __kmalloc_node+0x200/0x3b0 mm/slub.c:4456 kmalloc_node include/linux/slab.h:630 [inline] kvmalloc_node+0x84/0x130 mm/util.c:619 kvmalloc include/linux/mm.h:816 [inline] xlog_cil_alloc_shadow_bufs fs/xfs/xfs_log_cil.c:224 [inline] xlog_cil_commit+0x2aa/0x2010 fs/xfs/xfs_log_cil.c:1264 __xfs_trans_commit+0x6b2/0xc50 fs/xfs/xfs_trans.c:881 xfs_qm_qino_alloc+0x754/0x950 fs/xfs/xfs_qm.c:824 xfs_qm_init_quotainos+0x4d4/0x6c0 fs/xfs/xfs_qm.c:1559 xfs_qm_init_quotainfo+0xa3/0x990 fs/xfs/xfs_qm.c:644 xfs_qm_mount_quotas+0x95/0x5f0 fs/xfs/xfs_qm.c:1435 xfs_mountfs+0x1449/0x1b10 fs/xfs/xfs_mount.c:904 xfs_fs_fill_super+0x11a4/0x13f0 fs/xfs/xfs_super.c:1684 get_tree_bdev+0x3f1/0x610 fs/super.c:1325 vfs_get_tree+0x88/0x270 fs/super.c:1530 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1340 [inline] free_pcp_prepare mm/page_alloc.c:1391 [inline] free_unref_page_prepare+0x637/0x6c0 mm/page_alloc.c:3317 free_unref_page+0x94/0x280 mm/page_alloc.c:3396 free_slab mm/slub.c:2020 [inline] discard_slab mm/slub.c:2026 [inline] __unfreeze_partials+0x1a5/0x200 mm/slub.c:2512 put_cpu_partial+0x12d/0x190 mm/slub.c:2592 qlist_free_all+0x35/0x90 mm/kasan/quarantine.c:176 kasan_quarantine_reduce+0x150/0x160 mm/kasan/quarantine.c:283 __kasan_slab_alloc+0x2f/0xd0 mm/kasan/common.c:444 kasan_slab_alloc include/linux/kasan.h:254 [inline] slab_post_alloc_hook+0x4c/0x380 mm/slab.h:519 slab_alloc_node mm/slub.c:3225 [inline] slab_alloc mm/slub.c:3233 [inline] kmem_cache_alloc_trace+0x103/0x2a0 mm/slub.c:3250 kmalloc include/linux/slab.h:607 [inline] kzalloc include/linux/slab.h:738 [inline] snd_pcm_oss_change_params_locked+0x13d/0x3e00 sound/core/oss/pcm_oss.c:862 snd_pcm_oss_change_params sound/core/oss/pcm_oss.c:1107 [inline] snd_pcm_oss_get_active_substream+0x1dd/0x270 sound/core/oss/pcm_oss.c:1124 snd_pcm_oss_get_channels sound/core/oss/pcm_oss.c:1819 [inline] snd_pcm_oss_set_channels+0x1b7/0x4d0 sound/core/oss/pcm_oss.c:1811 snd_pcm_oss_ioctl+0xac9/0xc60 sound/core/oss/pcm_oss.c:2672 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl+0xfa/0x170 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 Memory state around the buggy address: ffff88807dc77900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88807dc77980: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88807dc77a00: 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff88807dc77a80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88807dc77b00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================