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quota: Add more checking after reading from quota file

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It would be better to do more sanity checking (eg. dqdh_entries,
block no.) for the content read from quota file, which can prevent
corrupting the quota file.

Link: https://lore.kernel.org/r/20220923134555.2623931-4-chengzhihao1@huawei.com
Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Zhihao Cheng 2022-09-23 21:45:54 +08:00 committed by Jan Kara
parent 3fc61e0e96
commit 191249f708
1 changed files with 17 additions and 2 deletions
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19
fs/quota/quota_tree.c
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@ -96,6 +96,11 @@ static int check_dquot_block_header(struct qtree_mem_dqinfo *info,
err = do_check_range(info->dqi_sb, "dqdh_prev_free",
le32_to_cpu(dh->dqdh_prev_free), 0,
info->dqi_blocks - 1);
if (err)
return err;
err = do_check_range(info->dqi_sb, "dqdh_entries",
le16_to_cpu(dh->dqdh_entries), 0,
qtree_dqstr_in_blk(info));
return err;
}
@ -348,6 +353,10 @@ static int do_insert_tree(struct qtree_mem_dqinfo *info, struct dquot *dquot,
}
ref = (__le32 *)buf;
newblk = le32_to_cpu(ref[get_index(info, dquot->dq_id, depth)]);
ret = do_check_range(dquot->dq_sb, "block", newblk, 0,
info->dqi_blocks - 1);
if (ret)
goto out_buf;
if (!newblk)
newson = 1;
if (depth == info->dqi_qtree_depth - 1) {
@ -739,15 +748,21 @@ static int find_next_id(struct qtree_mem_dqinfo *info, qid_t *id,
goto out_buf;
}
for (i = __get_index(info, *id, depth); i < epb; i++) {
if (ref[i] == cpu_to_le32(0)) {
uint blk_no = le32_to_cpu(ref[i]);
if (blk_no == 0) {
*id += level_inc;
continue;
}
ret = do_check_range(info->dqi_sb, "block", blk_no, 0,
info->dqi_blocks - 1);
if (ret)
goto out_buf;
if (depth == info->dqi_qtree_depth - 1) {
ret = 0;
goto out_buf;
}
ret = find_next_id(info, id, le32_to_cpu(ref[i]), depth + 1);
ret = find_next_id(info, id, blk_no, depth + 1);
if (ret != -ENOENT)
break;
}