Re: [syzbot] [crypto?] KMSAN: uninit-value in lzo1x_1_do_compress (2)

[syzbot <syzbot+9a049ebdaacbb076e50a@syzkaller.appspotmail.com>]

syzbot has found a reproducer for the following issue on:

HEAD commit:    3b68086599f8 Merge tag 'sched_urgent_for_v6.9_rc5' of git:..
git tree:       upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=1717a99f180000
kernel config:  https://syzkaller.appspot.com/x/.config?x=87a805e655619c64
dashboard link: https://syzkaller.appspot.com/bug?extid=9a049ebdaacbb076e50a
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1293271b180000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=173fe0fd180000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/6a0c6d102762/disk-3b680865.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/02126711948e/vmlinux-3b680865.xz
kernel image: https://storage.googleapis.com/syzbot-assets/7d390469c033/bzImage-3b680865.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/4f2c52f00058/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+9a049ebdaacbb076e50a@syzkaller.appspotmail.com

=====================================================
BUG: KMSAN: uninit-value in lzo1x_1_do_compress+0x913/0x2510 lib/lzo/lzo1x_compress.c:107
 lzo1x_1_do_compress+0x913/0x2510 lib/lzo/lzo1x_compress.c:107
 lzogeneric1x_1_compress+0x26a/0x11b0 lib/lzo/lzo1x_compress.c:333
 lzo1x_1_compress+0x47/0x80 lib/lzo/lzo1x_compress.c:383
 __lzo_compress crypto/lzo.c:58 [inline]
 lzo_scompress+0x98/0x180 crypto/lzo.c:79
 scomp_acomp_comp_decomp+0x7c6/0xb90
 scomp_acomp_compress+0x32/0x40 crypto/scompress.c:187
 crypto_acomp_compress include/crypto/acompress.h:308 [inline]
 zswap_compress+0x377/0xb10 mm/zswap.c:1040
 zswap_store+0x2180/0x2ca0 mm/zswap.c:1573
 swap_writepage+0x126/0x4c0 mm/page_io.c:198
 shmem_writepage+0x1826/0x1f70 mm/shmem.c:1518
 pageout mm/vmscan.c:660 [inline]
 shrink_folio_list+0x4a55/0x7910 mm/vmscan.c:1323
 evict_folios+0x9d7f/0xcc20 mm/vmscan.c:4537
 try_to_shrink_lruvec+0x160e/0x1a50 mm/vmscan.c:4733
 shrink_one+0x66f/0xd40 mm/vmscan.c:4772
 shrink_many mm/vmscan.c:4835 [inline]
 lru_gen_shrink_node mm/vmscan.c:4935 [inline]
 shrink_node+0x4856/0x55f0 mm/vmscan.c:5894
 kswapd_shrink_node mm/vmscan.c:6704 [inline]
 balance_pgdat mm/vmscan.c:6895 [inline]
 kswapd+0x1eba/0x4460 mm/vmscan.c:7164
 kthread+0x3e2/0x540 kernel/kthread.c:388
 ret_from_fork+0x6d/0x90 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

Uninit was stored to memory at:
 memcpy_from_iter lib/iov_iter.c:73 [inline]
 iterate_bvec include/linux/iov_iter.h:122 [inline]
 iterate_and_advance2 include/linux/iov_iter.h:249 [inline]
 iterate_and_advance include/linux/iov_iter.h:271 [inline]
 __copy_from_iter lib/iov_iter.c:249 [inline]
 copy_page_from_iter_atomic+0x12b7/0x2b60 lib/iov_iter.c:481
 generic_perform_write+0x4c1/0xc60 mm/filemap.c:3982
 shmem_file_write_iter+0x2bd/0x2f0 mm/shmem.c:2920
 do_iter_readv_writev+0x7e6/0x960
 vfs_iter_write+0x459/0xd00 fs/read_write.c:895
 lo_write_bvec drivers/block/loop.c:246 [inline]
 lo_write_simple drivers/block/loop.c:267 [inline]
 do_req_filebacked drivers/block/loop.c:491 [inline]
 loop_handle_cmd drivers/block/loop.c:1907 [inline]
 loop_process_work+0x1502/0x3440 drivers/block/loop.c:1942
 loop_rootcg_workfn+0x2b/0x40 drivers/block/loop.c:1973
 process_one_work kernel/workqueue.c:3254 [inline]
 process_scheduled_works+0xa81/0x1bd0 kernel/workqueue.c:3335
 worker_thread+0xea5/0x1560 kernel/workqueue.c:3416
 kthread+0x3e2/0x540 kernel/kthread.c:388
 ret_from_fork+0x6d/0x90 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

Uninit was stored to memory at:
 ntfs_write_bh+0x652/0xdb0 fs/ntfs3/fsntfs.c:1450
 indx_write fs/ntfs3/index.c:1027 [inline]
 indx_insert_into_root+0x36f4/0x37d0 fs/ntfs3/index.c:1761
 indx_insert_entry+0xe1d/0xee0 fs/ntfs3/index.c:1975
 ntfs_create_inode+0x49b6/0x5100 fs/ntfs3/inode.c:1671
 ntfs_atomic_open+0x90a/0xbb0 fs/ntfs3/namei.c:434
 atomic_open fs/namei.c:3360 [inline]
 lookup_open fs/namei.c:3468 [inline]
 open_last_lookups fs/namei.c:3566 [inline]
 path_openat+0x2230/0x5b00 fs/namei.c:3796
 do_filp_open+0x20e/0x590 fs/namei.c:3826
 do_sys_openat2+0x1bf/0x2f0 fs/open.c:1406
 do_sys_open fs/open.c:1421 [inline]
 __do_sys_creat fs/open.c:1497 [inline]
 __se_sys_creat fs/open.c:1491 [inline]
 __x64_sys_creat+0xe6/0x140 fs/open.c:1491
 x64_sys_call+0x2966/0x3b50 arch/x86/include/generated/asm/syscalls_64.h:86
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Uninit was stored to memory at:
 hdr_insert_de+0x3d4/0x3f0 fs/ntfs3/index.c:838
 indx_insert_into_root+0x33f6/0x37d0 fs/ntfs3/index.c:1753
 indx_insert_entry+0xe1d/0xee0 fs/ntfs3/index.c:1975
 ntfs_create_inode+0x49b6/0x5100 fs/ntfs3/inode.c:1671
 ntfs_atomic_open+0x90a/0xbb0 fs/ntfs3/namei.c:434
 atomic_open fs/namei.c:3360 [inline]
 lookup_open fs/namei.c:3468 [inline]
 open_last_lookups fs/namei.c:3566 [inline]
 path_openat+0x2230/0x5b00 fs/namei.c:3796
 do_filp_open+0x20e/0x590 fs/namei.c:3826
 do_sys_openat2+0x1bf/0x2f0 fs/open.c:1406
 do_sys_open fs/open.c:1421 [inline]
 __do_sys_creat fs/open.c:1497 [inline]
 __se_sys_creat fs/open.c:1491 [inline]
 __x64_sys_creat+0xe6/0x140 fs/open.c:1491
 x64_sys_call+0x2966/0x3b50 arch/x86/include/generated/asm/syscalls_64.h:86
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcf/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:3804 [inline]
 slab_alloc_node mm/slub.c:3845 [inline]
 kmem_cache_alloc+0x5b6/0xbe0 mm/slub.c:3852
 ntfs_create_inode+0x5e0/0x5100 fs/ntfs3/inode.c:1314
 ntfs_atomic_open+0x90a/0xbb0 fs/ntfs3/namei.c:434
 atomic_open fs/namei.c:3360 [inline]
 lookup_open fs/namei.c:3468 [inline]
 open_last_lookups fs/namei.c:3566 [inline]
 path_openat+0x2230/0x5b00 fs/namei.c:3796
 do_filp_open+0x20e/0x590 fs/namei.c:3826
 do_sys_openat2+0x1bf/0x2f0 fs/open.c:1406
 do_sys_open fs/open.c:1421 [inline]
 __do_sys_creat fs/open.c:1497 [inline]
 __se_sys_creat fs/open.c:1491 [inline]
 __x64_sys_creat+0xe6/0x140 fs/open.c:1491
 x64_sys_call+0x2966/0x3b50 arch/x86/include/generated/asm/syscalls_64.h:86
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

CPU: 0 PID: 80 Comm: kswapd0 Not tainted 6.9.0-rc4-syzkaller-00274-g3b68086599f8 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
=====================================================


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