=====================================================
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+0xaae/0x3000 fs/buffer.c:2149
 block_write_begin fs/buffer.c:2260 [inline]
 cont_write_begin+0x10df/0x1ba0 fs/buffer.c:2599
 hfsplus_write_begin+0x85/0x130 fs/hfsplus/inode.c:46
 cont_expand_zero fs/buffer.c:2526 [inline]
 cont_write_begin+0x35d/0x1ba0 fs/buffer.c:2589
 hfsplus_write_begin+0x85/0x130 fs/hfsplus/inode.c:46
 generic_cont_expand_simple+0x162/0x390 fs/buffer.c:2490
 hfsplus_setattr+0x2af/0x5c0 fs/hfsplus/inode.c:258
 notify_change+0x1990/0x1aa0 fs/attr.c:552
 do_truncate+0x224/0x2a0 fs/open.c:65
 vfs_truncate+0x921/0x9d0 fs/open.c:115
 do_sys_truncate+0x103/0x240 fs/open.c:138
 __do_compat_sys_truncate fs/open.c:156 [inline]
 __se_compat_sys_truncate fs/open.c:154 [inline]
 __ia32_compat_sys_truncate+0x77/0xc0 fs/open.c:154
 ia32_sys_call+0xa11/0x42c0 arch/x86/include/generated/asm/syscalls_32.h:93
 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
 __do_fast_syscall_32+0xb0/0x110 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:4153 [inline]
 slab_alloc_node mm/slub.c:4196 [inline]
 __do_kmalloc_node mm/slub.c:4326 [inline]
 __kmalloc_noprof+0x95f/0x1310 mm/slub.c:4339
 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+0xaae/0x3000 fs/buffer.c:2149
 block_write_begin fs/buffer.c:2260 [inline]
 cont_write_begin+0x10df/0x1ba0 fs/buffer.c:2599
 hfsplus_write_begin+0x85/0x130 fs/hfsplus/inode.c:46
 cont_expand_zero fs/buffer.c:2526 [inline]
 cont_write_begin+0x35d/0x1ba0 fs/buffer.c:2589
 hfsplus_write_begin+0x85/0x130 fs/hfsplus/inode.c:46
 generic_cont_expand_simple+0x162/0x390 fs/buffer.c:2490
 hfsplus_setattr+0x2af/0x5c0 fs/hfsplus/inode.c:258
 notify_change+0x1990/0x1aa0 fs/attr.c:552
 do_truncate+0x224/0x2a0 fs/open.c:65
 vfs_truncate+0x921/0x9d0 fs/open.c:115
 do_sys_truncate+0x103/0x240 fs/open.c:138
 __do_compat_sys_truncate fs/open.c:156 [inline]
 __se_compat_sys_truncate fs/open.c:154 [inline]
 __ia32_compat_sys_truncate+0x77/0xc0 fs/open.c:154
 ia32_sys_call+0xa11/0x42c0 arch/x86/include/generated/asm/syscalls_32.h:93
 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
 __do_fast_syscall_32+0xb0/0x110 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: 1 UID: 0 PID: 4889 Comm: syz.1.13124 Tainted: G        W           6.15.0-rc7-syzkaller-00002-gb36ddb9210e6 #0 PREEMPT(undef) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
=====================================================