Commit 4e240d1b authored by Jaegeuk Kim's avatar Jaegeuk Kim

f2fs: check memory boundary by insane namelen

If namelen is corrupted to have very long value, fill_dentries can copy
wrong memory area.
Reviewed-by: default avatarChao Yu <yuchao0@huawei.com>
Signed-off-by: default avatarJaegeuk Kim <jaegeuk@kernel.org>
parent 1e771e83
......@@ -808,6 +808,17 @@ int f2fs_fill_dentries(struct dir_context *ctx, struct f2fs_dentry_ptr *d,
de_name.name = d->filename[bit_pos];
de_name.len = le16_to_cpu(de->name_len);
/* check memory boundary before moving forward */
bit_pos += GET_DENTRY_SLOTS(le16_to_cpu(de->name_len));
if (unlikely(bit_pos > d->max)) {
f2fs_msg(sbi->sb, KERN_WARNING,
"%s: corrupted namelen=%d, run fsck to fix.",
__func__, le16_to_cpu(de->name_len));
set_sbi_flag(sbi, SBI_NEED_FSCK);
err = -EINVAL;
goto out;
}
if (f2fs_encrypted_inode(d->inode)) {
int save_len = fstr->len;
......@@ -830,7 +841,6 @@ int f2fs_fill_dentries(struct dir_context *ctx, struct f2fs_dentry_ptr *d,
if (readdir_ra)
f2fs_ra_node_page(sbi, le32_to_cpu(de->ino));
bit_pos += GET_DENTRY_SLOTS(le16_to_cpu(de->name_len));
ctx->pos = start_pos + bit_pos;
}
out:
......
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