syzbot

loop0: detected capacity change from 0 to 64
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BUG: KMSAN: uninit-value in hfs_find_set_zero_bits+0x836/0xca0 fs/hfs/bitmap.c:45
 hfs_find_set_zero_bits+0x836/0xca0 fs/hfs/bitmap.c:45
 hfs_vbm_search_free+0x141/0x530 fs/hfs/bitmap.c:151
 hfs_extend_file+0x69e/0x19f0 fs/hfs/extent.c:408
 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
 generic_perform_write+0x4d8/0x1080 mm/filemap.c:4189
 __generic_file_write_iter+0x207/0x460 mm/filemap.c:4290
 generic_file_write_iter+0x10c/0x940 mm/filemap.c:4316
 new_sync_write fs/read_write.c:586 [inline]
 vfs_write+0xb34/0x1540 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:4121 [inline]
 slab_alloc_node mm/slub.c:4164 [inline]
 __kmalloc_cache_noprof+0x8e3/0xdf0 mm/slub.c:4320
 kmalloc_noprof include/linux/slab.h:901 [inline]
 hfs_mdb_get+0x1bce/0x28a0 fs/hfs/mdb.c:175
 hfs_fill_super+0x424/0xb00 fs/hfs/super.c:337
 get_tree_bdev_flags+0x6ec/0x910 fs/super.c:1636
 get_tree_bdev+0x37/0x50 fs/super.c:1659
 hfs_get_tree+0x34/0x40 fs/hfs/super.c:388
 vfs_get_tree+0xb1/0x5a0 fs/super.c:1814
 do_new_mount+0x71f/0x15e0 fs/namespace.c:3560
 path_mount+0x742/0x1f10 fs/namespace.c:3887
 do_mount fs/namespace.c:3900 [inline]
 __do_sys_mount fs/namespace.c:4111 [inline]
 __se_sys_mount+0x71f/0x800 fs/namespace.c:4088
 __x64_sys_mount+0xe4/0x150 fs/namespace.c:4088
 x64_sys_call+0x39bf/0x3c30 arch/x86/include/generated/asm/syscalls_64.h:166
 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: 5786 Comm: syz-executor101 Not tainted 6.14.0-rc1-syzkaller-00081-gbb066fe812d6 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
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