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quota: check block number when reading the block in quota file

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The block number in the quota tree on disk should be smaller than the
v2_disk_dqinfo.dqi_blocks. If the quota file was corrupted, we may be
allocating an 'allocated' block and that would lead to a loop in a tree,
which will probably trigger oops later. This patch adds a check for the
block number in the quota tree to prevent such potential issue.

Link: https://lore.kernel.org/r/20211008093821.1001186-2-yi.zhang@huawei.com
Signed-off-by: Zhang Yi <yi.zhang@huawei.com>
Cc: stable@kernel.org
Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Zhang Yi 2021-10-08 17:38:20 +08:00 committed by Jan Kara
parent 64570fbc14
commit 9bf3d20331
1 changed files with 14 additions and 0 deletions
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14
fs/quota/quota_tree.c
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@ -479,6 +479,13 @@ static int remove_tree(struct qtree_mem_dqinfo *info, struct dquot *dquot,
goto out_buf;
}
newblk = le32_to_cpu(ref[get_index(info, dquot->dq_id, depth)]);
if (newblk < QT_TREEOFF || newblk >= info->dqi_blocks) {
quota_error(dquot->dq_sb, "Getting block too big (%u >= %u)",
newblk, info->dqi_blocks);
ret = -EUCLEAN;
goto out_buf;
}
if (depth == info->dqi_qtree_depth - 1) {
ret = free_dqentry(info, dquot, newblk);
newblk = 0;
@ -578,6 +585,13 @@ static loff_t find_tree_dqentry(struct qtree_mem_dqinfo *info,
blk = le32_to_cpu(ref[get_index(info, dquot->dq_id, depth)]);
if (!blk) /* No reference? */
goto out_buf;
if (blk < QT_TREEOFF || blk >= info->dqi_blocks) {
quota_error(dquot->dq_sb, "Getting block too big (%u >= %u)",
blk, info->dqi_blocks);
ret = -EUCLEAN;
goto out_buf;
}
if (depth < info->dqi_qtree_depth - 1)
ret = find_tree_dqentry(info, dquot, blk, depth+1);
else