loop4: detected capacity change from 0 to 1024
=====================================================
BUG: KMSAN: uninit-value in __hfsplus_ext_read_extent fs/hfsplus/extents.c:167 [inline]
BUG: KMSAN: uninit-value in __hfsplus_ext_cache_extent+0x82c/0x970 fs/hfsplus/extents.c:191
 __hfsplus_ext_read_extent fs/hfsplus/extents.c:167 [inline]
 __hfsplus_ext_cache_extent+0x82c/0x970 fs/hfsplus/extents.c:191
 hfsplus_ext_read_extent fs/hfsplus/extents.c:218 [inline]
 hfsplus_file_extend+0x775/0x1ba0 fs/hfsplus/extents.c:462
 hfsplus_get_block+0xe99/0x1690 fs/hfsplus/extents.c:245
 __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
 hfsplus_write_begin+0x85/0x120 fs/hfsplus/inode.c:46
 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
 new_sync_write fs/read_write.c:586 [inline]
 vfs_write+0xb2b/0x1540 fs/read_write.c:679
 ksys_write+0x240/0x4b0 fs/read_write.c:731
 __do_sys_write fs/read_write.c:742 [inline]
 __se_sys_write fs/read_write.c:739 [inline]
 __x64_sys_write+0x93/0xe0 fs/read_write.c:739
 x64_sys_call+0x3161/0x3c30 arch/x86/include/generated/asm/syscalls_64.h:2
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Uninit was created at:
 slab_post_alloc_hook mm/slub.c:4110 [inline]
 slab_alloc_node mm/slub.c:4153 [inline]
 __do_kmalloc_node mm/slub.c:4282 [inline]
 __kmalloc_noprof+0x923/0x1230 mm/slub.c:4295
 kmalloc_noprof include/linux/slab.h:905 [inline]
 hfsplus_find_init+0x95/0x1d0 fs/hfsplus/bfind.c:21
 hfsplus_ext_read_extent fs/hfsplus/extents.c:216 [inline]
 hfsplus_file_extend+0x6d8/0x1ba0 fs/hfsplus/extents.c:462
 hfsplus_get_block+0xe99/0x1690 fs/hfsplus/extents.c:245
 __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
 hfsplus_write_begin+0x85/0x120 fs/hfsplus/inode.c:46
 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
 new_sync_write fs/read_write.c:586 [inline]
 vfs_write+0xb2b/0x1540 fs/read_write.c:679
 ksys_write+0x240/0x4b0 fs/read_write.c:731
 __do_sys_write fs/read_write.c:742 [inline]
 __se_sys_write fs/read_write.c:739 [inline]
 __x64_sys_write+0x93/0xe0 fs/read_write.c:739
 x64_sys_call+0x3161/0x3c30 arch/x86/include/generated/asm/syscalls_64.h:2
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

CPU: 1 UID: 0 PID: 6732 Comm: syz.4.227 Not tainted 6.12.0-syzkaller-12113-gbcc8eda6d349 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
=====================================================