diff options
| author | Zhihao Cheng <chengzhihao1@huawei.com> | 2022-09-23 21:45:54 +0800 |
|---|---|---|
| committer | Jan Kara <jack@suse.cz> | 2022-09-29 15:37:30 +0200 |
| commit | 191249f708897fc34c78f4494f7156896aaaeca9 (patch) | |
| tree | 5d10066f0b4a10b4a50c9718f8a3c04decef22fe /fs/quota | |
| parent | 3fc61e0e96a3261aacfd3150fb3a9228f7ce5dd6 (diff) | |
quota: Add more checking after reading from quota file
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>
Diffstat (limited to 'fs/quota')
| -rw-r--r-- | fs/quota/quota_tree.c | 19 |
1 files changed, 17 insertions, 2 deletions
diff --git a/fs/quota/quota_tree.c b/fs/quota/quota_tree.c index 0fa73ca28045..0f1493e0f6d0 100644 --- a/fs/quota/quota_tree.c +++ b/fs/quota/quota_tree.c @@ -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; } |