loop1: 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 ffff888074c91218 by task syz.1.205/4859 CPU: 1 PID: 4859 Comm: syz.1.205 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 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: 0033:0x7f7e036ea749 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:00007f7e01951038 EFLAGS: 00000246 ORIG_RAX: 00000000000000c2 RAX: ffffffffffffffda RBX: 00007f7e03940fa0 RCX: 00007f7e036ea749 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000200000000080 RBP: 00007f7e0376ef91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f7e03941038 R14: 00007f7e03940fa0 R15: 00007ffedf42c278 Allocated by task 4859: 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 ffff888074c91000 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 536 bytes inside of 1024-byte region [ffff888074c91000, ffff888074c91400) The buggy address belongs to the page: page:ffffea0001d32400 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x74c90 head:ffffea0001d32400 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 0xd2a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 4173, ts 49347848049, free_ts 49347688171 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_track_caller+0x1fc/0x3a0 mm/slub.c:4963 kmalloc_reserve net/core/skbuff.c:356 [inline] __alloc_skb+0x22c/0x750 net/core/skbuff.c:427 alloc_skb_fclone include/linux/skbuff.h:1212 [inline] sk_stream_alloc_skb+0x1fa/0xa60 net/ipv4/tcp.c:889 tso_fragment net/ipv4/tcp_output.c:2131 [inline] tcp_write_xmit+0xf9e/0x6580 net/ipv4/tcp_output.c:2704 __tcp_push_pending_frames+0x92/0x250 net/ipv4/tcp_output.c:2903 tcp_push_pending_frames include/net/tcp.h:1916 [inline] tcp_data_snd_check net/ipv4/tcp_input.c:5572 [inline] tcp_rcv_established+0xf25/0x1cb0 net/ipv4/tcp_input.c:5983 tcp_v4_do_rcv+0x44b/0x9b0 net/ipv4/tcp_ipv4.c:1731 sk_backlog_rcv include/net/sock.h:1067 [inline] __release_sock+0x1b9/0x420 net/core/sock.c:2730 __sk_flush_backlog+0x22/0x30 net/core/sock.c:2750 sk_flush_backlog include/net/sock.h:1164 [inline] tcp_sendmsg_locked+0x27f0/0x3590 net/ipv4/tcp.c:1310 tcp_sendmsg+0x2b/0x40 net/ipv4/tcp.c:1457 sock_sendmsg_nosec net/socket.c:706 [inline] __sock_sendmsg net/socket.c:718 [inline] sock_write_iter+0x29c/0x380 net/socket.c:1089 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 put_page include/linux/mm.h:1258 [inline] __skb_frag_unref include/linux/skbuff.h:3254 [inline] skb_release_data+0x3fa/0x850 net/core/skbuff.c:672 skb_release_all net/core/skbuff.c:742 [inline] __kfree_skb+0x4c/0x60 net/core/skbuff.c:756 tcp_clean_rtx_queue net/ipv4/tcp_input.c:3407 [inline] tcp_ack+0x2086/0x6260 net/ipv4/tcp_input.c:3964 tcp_rcv_established+0xea6/0x1cb0 net/ipv4/tcp_input.c:5981 tcp_v4_do_rcv+0x44b/0x9b0 net/ipv4/tcp_ipv4.c:1731 sk_backlog_rcv include/net/sock.h:1067 [inline] __release_sock+0x1b9/0x420 net/core/sock.c:2730 __sk_flush_backlog+0x22/0x30 net/core/sock.c:2750 sk_flush_backlog include/net/sock.h:1164 [inline] tcp_sendmsg_locked+0x27f0/0x3590 net/ipv4/tcp.c:1310 tcp_sendmsg+0x2b/0x40 net/ipv4/tcp.c:1457 sock_sendmsg_nosec net/socket.c:706 [inline] __sock_sendmsg net/socket.c:718 [inline] sock_write_iter+0x29c/0x380 net/socket.c:1089 call_write_iter include/linux/fs.h:2173 [inline] new_sync_write fs/read_write.c:507 [inline] vfs_write+0x712/0xd00 fs/read_write.c:594 ksys_write+0x14d/0x250 fs/read_write.c:647 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: ffff888074c91100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888074c91180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888074c91200: 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff888074c91280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888074c91300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================