[lvc-project] [PATCH v2] f2fs: ensure that node info flags are always initialized

[Chao Yu]

On 2024/12/13 1:57, Dmitry Antipov wrote:
> Syzbot has reported the following KMSAN splat:
> 
> BUG: KMSAN: uninit-value in f2fs_new_node_page+0x1494/0x1630
>   f2fs_new_node_page+0x1494/0x1630
>   f2fs_new_inode_page+0xb9/0x100
>   f2fs_init_inode_metadata+0x176/0x1e90
>   f2fs_add_inline_entry+0x723/0xc90
>   f2fs_do_add_link+0x48f/0xa70
>   f2fs_symlink+0x6af/0xfc0
>   vfs_symlink+0x1f1/0x470
>   do_symlinkat+0x471/0xbc0
>   __x64_sys_symlink+0xcf/0x140
>   x64_sys_call+0x2fcc/0x3d90
>   do_syscall_64+0xd9/0x1b0
>   entry_SYSCALL_64_after_hwframe+0x77/0x7f
> 
> Local variable new_ni created at:
>   f2fs_new_node_page+0x9d/0x1630
>   f2fs_new_inode_page+0xb9/0x100
> 
> So adjust 'f2fs_get_node_info()' to ensure that 'flag'
> field of 'struct node_info' is always initialized.
> 
> Reported-by: syzbot+5141f6db57a2f7614352 at syzkaller.appspotmail.com
> Closes: https://syzkaller.appspot.com/bug?extid=5141f6db57a2f7614352
> Fixes: e05df3b115e7 ("f2fs: add node operations")
> Suggested-by: Chao Yu <chao at kernel.org>
> Signed-off-by: Dmitry Antipov <dmantipov at yandex.ru>

Reviewed-by: Chao Yu <chao at kernel.org>

Thanks,