netlink: 4 bytes leftover after parsing attributes in process `syz.8.2642'.
=====================================================
BUG: KMSAN: uninit-value in __hfsplus_ext_read_extent fs/hfsplus/extents.c:167 [inline]
BUG: KMSAN: uninit-value in __hfsplus_ext_cache_extent+0x7cb/0x990 fs/hfsplus/extents.c:191
 __hfsplus_ext_read_extent fs/hfsplus/extents.c:167 [inline]
 __hfsplus_ext_cache_extent+0x7cb/0x990 fs/hfsplus/extents.c:191
 hfsplus_ext_read_extent fs/hfsplus/extents.c:218 [inline]
 hfsplus_file_extend+0x7b5/0x1df0 fs/hfsplus/extents.c:462
 hfsplus_get_block+0xfc3/0x1a20 fs/hfsplus/extents.c:245
 __block_write_begin_int+0xaab/0x3000 fs/buffer.c:2116
 block_write_begin fs/buffer.c:2227 [inline]
 cont_write_begin+0x10df/0x1ba0 fs/buffer.c:2566
 hfsplus_write_begin+0x85/0x130 fs/hfsplus/inode.c:46
 generic_perform_write+0x3f4/0x10c0 mm/filemap.c:4103
 __generic_file_write_iter+0x213/0x460 mm/filemap.c:4220
 generic_file_write_iter+0x131/0x980 mm/filemap.c:4246
 __kernel_write_iter+0x679/0xda0 fs/read_write.c:617
 dump_emit_page fs/coredump.c:885 [inline]
 dump_user_range+0xd76/0x1480 fs/coredump.c:959
 elf_core_dump+0x67df/0x6ac0 fs/binfmt_elf.c:2128
 do_coredump+0x4719/0x5f20 fs/coredump.c:759
 get_signal+0x20ab/0x2a20 kernel/signal.c:3019
 arch_do_signal_or_restart+0x53/0xbe0 arch/x86/kernel/signal.c:337
 exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0x6c/0xb0 kernel/entry/common.c:218
 do_syscall_64+0xe6/0x1b0 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Uninit was created at:
 slab_post_alloc_hook mm/slub.c:4167 [inline]
 slab_alloc_node mm/slub.c:4210 [inline]
 __do_kmalloc_node mm/slub.c:4340 [inline]
 __kmalloc_noprof+0x95f/0x1310 mm/slub.c:4353
 kmalloc_noprof include/linux/slab.h:909 [inline]
 hfsplus_find_init+0x90/0x1d0 fs/hfsplus/bfind.c:21
 hfsplus_ext_read_extent fs/hfsplus/extents.c:216 [inline]
 hfsplus_file_extend+0x72f/0x1df0 fs/hfsplus/extents.c:462
 hfsplus_get_block+0xfc3/0x1a20 fs/hfsplus/extents.c:245
 __block_write_begin_int+0xaab/0x3000 fs/buffer.c:2116
 block_write_begin fs/buffer.c:2227 [inline]
 cont_write_begin+0x10df/0x1ba0 fs/buffer.c:2566
 hfsplus_write_begin+0x85/0x130 fs/hfsplus/inode.c:46
 generic_perform_write+0x3f4/0x10c0 mm/filemap.c:4103
 __generic_file_write_iter+0x213/0x460 mm/filemap.c:4220
 generic_file_write_iter+0x131/0x980 mm/filemap.c:4246
 __kernel_write_iter+0x679/0xda0 fs/read_write.c:617
 dump_emit_page fs/coredump.c:885 [inline]
 dump_user_range+0xd76/0x1480 fs/coredump.c:959
 elf_core_dump+0x67df/0x6ac0 fs/binfmt_elf.c:2128
 do_coredump+0x4719/0x5f20 fs/coredump.c:759
 get_signal+0x20ab/0x2a20 kernel/signal.c:3019
 arch_do_signal_or_restart+0x53/0xbe0 arch/x86/kernel/signal.c:337
 exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0x6c/0xb0 kernel/entry/common.c:218
 do_syscall_64+0xe6/0x1b0 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

CPU: 1 UID: 0 PID: 17849 Comm: syz.8.2642 Tainted: G        W           6.15.0-rc3-syzkaller-00094-g02ddfb981de8 #0 PREEMPT(undef) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/29/2025
=====================================================