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f2fs: Constrain the modification range of dir_level in the sysfs

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The {struct f2fs_sb_info}->dir_level can be modified through the sysfs
interface, but its value range is not limited. If the value exceeds
MAX_DIR_HASH_DEPTH and the mount options include "noinline_dentry",
the following error will occur:
[root@fedora ~]# mount -o noinline_dentry /dev/sdb  /mnt/sdb/
[root@fedora ~]# echo 128 > /sys/fs/f2fs/sdb/dir_level
[root@fedora ~]# cd /mnt/sdb/
[root@fedora sdb]# mkdir test
[root@fedora sdb]# cd test/
[root@fedora test]# mkdir test
mkdir: cannot create directory 'test': Argument list too long

Signed-off-by: Yongpeng Yang <yangyongpeng1@oppo.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Yongpeng Yang 2023-12-22 11:29:00 +08:00 committed by Jaegeuk Kim
parent 94e7eb4241
commit 0145eed6ed
1 changed files with 7 additions and 0 deletions
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7
fs/f2fs/sysfs.c
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@ -741,6 +741,13 @@ static ssize_t __sbi_store(struct f2fs_attr *a,
return count;
}
if (!strcmp(a->attr.name, "dir_level")) {
if (t > MAX_DIR_HASH_DEPTH)
return -EINVAL;
sbi->dir_level = t;
return count;
}
*ui = (unsigned int)t;
return count;