=====================================================
BUG: KMSAN: uninit-value in __hfs_ext_read_extent fs/hfs/extent.c:160 [inline]
BUG: KMSAN: uninit-value in __hfs_ext_cache_extent+0x69f/0x7e0 fs/hfs/extent.c:179
 __hfs_ext_read_extent fs/hfs/extent.c:160 [inline]
 __hfs_ext_cache_extent+0x69f/0x7e0 fs/hfs/extent.c:179
 hfs_ext_read_extent fs/hfs/extent.c:202 [inline]
 hfs_extend_file+0x44c/0x19f0 fs/hfs/extent.c:401
 hfs_get_block+0x3d8/0xf50 fs/hfs/extent.c:353
 __block_write_begin_int+0xa6b/0x2f80 fs/buffer.c:2116
 block_write_begin fs/buffer.c:2226 [inline]
 cont_write_begin+0xf82/0x1940 fs/buffer.c:2577
 hfs_write_begin+0x85/0x120 fs/hfs/inode.c:52
 cont_expand_zero fs/buffer.c:2504 [inline]
 cont_write_begin+0x32f/0x1940 fs/buffer.c:2567
 hfs_write_begin+0x85/0x120 fs/hfs/inode.c:52
 generic_perform_write+0x4d8/0x1080 mm/filemap.c:4055
 __generic_file_write_iter+0x207/0x460 mm/filemap.c:4156
 generic_file_write_iter+0x102/0x5b0 mm/filemap.c:4182
 do_iter_readv_writev+0x88a/0xa30
 vfs_writev+0x56a/0x14f0 fs/read_write.c:1050
 do_pwritev fs/read_write.c:1146 [inline]
 __do_compat_sys_pwritev2 fs/read_write.c:1291 [inline]
 __se_compat_sys_pwritev2+0x282/0x480 fs/read_write.c:1283
 __ia32_compat_sys_pwritev2+0x11d/0x1a0 fs/read_write.c:1283
 ia32_sys_call+0x3587/0x4180 arch/x86/include/generated/asm/syscalls_32.h:380
 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
 __do_fast_syscall_32+0xb0/0x110 arch/x86/entry/common.c:386
 do_fast_syscall_32+0x38/0x80 arch/x86/entry/common.c:411
 do_SYSENTER_32+0x1f/0x30 arch/x86/entry/common.c:449
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e

Uninit was created at:
 slab_post_alloc_hook mm/slub.c:4125 [inline]
 slab_alloc_node mm/slub.c:4168 [inline]
 __do_kmalloc_node mm/slub.c:4297 [inline]
 __kmalloc_noprof+0x923/0x1230 mm/slub.c:4310
 kmalloc_noprof include/linux/slab.h:905 [inline]
 hfs_find_init+0x91/0x250 fs/hfs/bfind.c:21
 hfs_ext_read_extent fs/hfs/extent.c:200 [inline]
 hfs_extend_file+0x316/0x19f0 fs/hfs/extent.c:401
 hfs_get_block+0x3d8/0xf50 fs/hfs/extent.c:353
 __block_write_begin_int+0xa6b/0x2f80 fs/buffer.c:2116
 block_write_begin fs/buffer.c:2226 [inline]
 cont_write_begin+0xf82/0x1940 fs/buffer.c:2577
 hfs_write_begin+0x85/0x120 fs/hfs/inode.c:52
 cont_expand_zero fs/buffer.c:2504 [inline]
 cont_write_begin+0x32f/0x1940 fs/buffer.c:2567
 hfs_write_begin+0x85/0x120 fs/hfs/inode.c:52
 generic_perform_write+0x4d8/0x1080 mm/filemap.c:4055
 __generic_file_write_iter+0x207/0x460 mm/filemap.c:4156
 generic_file_write_iter+0x102/0x5b0 mm/filemap.c:4182
 do_iter_readv_writev+0x88a/0xa30
 vfs_writev+0x56a/0x14f0 fs/read_write.c:1050
 do_pwritev fs/read_write.c:1146 [inline]
 __do_compat_sys_pwritev2 fs/read_write.c:1291 [inline]
 __se_compat_sys_pwritev2+0x282/0x480 fs/read_write.c:1283
 __ia32_compat_sys_pwritev2+0x11d/0x1a0 fs/read_write.c:1283
 ia32_sys_call+0x3587/0x4180 arch/x86/include/generated/asm/syscalls_32.h:380
 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
 __do_fast_syscall_32+0xb0/0x110 arch/x86/entry/common.c:386
 do_fast_syscall_32+0x38/0x80 arch/x86/entry/common.c:411
 do_SYSENTER_32+0x1f/0x30 arch/x86/entry/common.c:449
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e

CPU: 0 UID: 0 PID: 6614 Comm: syz.5.159 Not tainted 6.13.0-rc5-syzkaller-00012-g0bc21e701a6f #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
=====================================================