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| author | Zhang Yi <yi.zhang@huawei.com> | 2021-10-08 11:38:20 +0200 |
|---|---|---|
| committer | Jan Kara <jack@suse.cz> | 2021-10-11 10:55:47 +0200 |
| commit | 9bf3d20331295b1ecb81f4ed9ef358c51699a050 (patch) | |
| tree | 2f3f6e8e8fa3d5fe79e092c152b3fedff25d259a /fs/quota/quota_tree.c | |
| parent | Linux 5.15-rc5 (diff) | |
| download | linux-9bf3d20331295b1ecb81f4ed9ef358c51699a050.tar.xz linux-9bf3d20331295b1ecb81f4ed9ef358c51699a050.zip | |
quota: check block number when reading the block in quota file
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>
Diffstat (limited to 'fs/quota/quota_tree.c')
| -rw-r--r-- | fs/quota/quota_tree.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/fs/quota/quota_tree.c b/fs/quota/quota_tree.c index d3e995e1046f..583b7f7715f9 100644 --- a/fs/quota/quota_tree.c +++ b/fs/quota/quota_tree.c @@ -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 |