=====================================================
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:459
 hfsplus_get_block+0xfc3/0x1a20 fs/hfsplus/extents.c:245
 __block_write_begin_int+0xa73/0x3030 fs/buffer.c:2145
 block_write_begin fs/buffer.c:2256 [inline]
 cont_write_begin+0x10e1/0x1bc0 fs/buffer.c:2594
 hfsplus_write_begin+0x85/0x130 fs/hfsplus/inode.c:48
 cont_expand_zero fs/buffer.c:2522 [inline]
 cont_write_begin+0x35d/0x1bc0 fs/buffer.c:2584
 hfsplus_write_begin+0x85/0x130 fs/hfsplus/inode.c:48
 generic_perform_write+0x362/0x1050 mm/filemap.c:4175
 __generic_file_write_iter+0x213/0x460 mm/filemap.c:4292
 generic_file_write_iter+0x131/0x980 mm/filemap.c:4318
 new_sync_write fs/read_write.c:593 [inline]
 vfs_write+0xbdf/0x15d0 fs/read_write.c:686
 ksys_pwrite64+0x1d6/0x2a0 fs/read_write.c:793
 __do_sys_ia32_pwrite64 arch/x86/kernel/sys_ia32.c:78 [inline]
 __se_sys_ia32_pwrite64 arch/x86/kernel/sys_ia32.c:75 [inline]
 __ia32_sys_ia32_pwrite64+0xf0/0x150 arch/x86/kernel/sys_ia32.c:75
 ia32_sys_call+0x3120/0x4310 arch/x86/include/generated/asm/syscalls_32.h:182
 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
 __do_fast_syscall_32+0xb0/0x150 arch/x86/entry/syscall_32.c:306
 do_fast_syscall_32+0x38/0x80 arch/x86/entry/syscall_32.c:331
 do_SYSENTER_32+0x1f/0x30 arch/x86/entry/syscall_32.c:369
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e

Uninit was created at:
 slab_post_alloc_hook mm/slub.c:4186 [inline]
 slab_alloc_node mm/slub.c:4229 [inline]
 __do_kmalloc_node mm/slub.c:4364 [inline]
 __kmalloc_noprof+0x95f/0x1310 mm/slub.c:4377
 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:459
 hfsplus_get_block+0xfc3/0x1a20 fs/hfsplus/extents.c:245
 __block_write_begin_int+0xa73/0x3030 fs/buffer.c:2145
 block_write_begin fs/buffer.c:2256 [inline]
 cont_write_begin+0x10e1/0x1bc0 fs/buffer.c:2594
 hfsplus_write_begin+0x85/0x130 fs/hfsplus/inode.c:48
 cont_expand_zero fs/buffer.c:2522 [inline]
 cont_write_begin+0x35d/0x1bc0 fs/buffer.c:2584
 hfsplus_write_begin+0x85/0x130 fs/hfsplus/inode.c:48
 generic_perform_write+0x362/0x1050 mm/filemap.c:4175
 __generic_file_write_iter+0x213/0x460 mm/filemap.c:4292
 generic_file_write_iter+0x131/0x980 mm/filemap.c:4318
 new_sync_write fs/read_write.c:593 [inline]
 vfs_write+0xbdf/0x15d0 fs/read_write.c:686
 ksys_pwrite64+0x1d6/0x2a0 fs/read_write.c:793
 __do_sys_ia32_pwrite64 arch/x86/kernel/sys_ia32.c:78 [inline]
 __se_sys_ia32_pwrite64 arch/x86/kernel/sys_ia32.c:75 [inline]
 __ia32_sys_ia32_pwrite64+0xf0/0x150 arch/x86/kernel/sys_ia32.c:75
 ia32_sys_call+0x3120/0x4310 arch/x86/include/generated/asm/syscalls_32.h:182
 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
 __do_fast_syscall_32+0xb0/0x150 arch/x86/entry/syscall_32.c:306
 do_fast_syscall_32+0x38/0x80 arch/x86/entry/syscall_32.c:331
 do_SYSENTER_32+0x1f/0x30 arch/x86/entry/syscall_32.c:369
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e

CPU: 0 UID: 0 PID: 6038 Comm: syz.1.13 Not tainted syzkaller #0 PREEMPT(none) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
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