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| author | Nikolay Borisov <nborisov@suse.com> | 2019-03-18 17:45:19 +0200 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2019-03-19 14:12:31 +0100 |
| commit | 7ff2c2a1a71e83f74574b8001ea88deb3c166ad7 (patch) | |
| tree | 97cec6b8466e56b77f6aadc84cbea18d64ee114b /fs | |
| parent | 3897b6f0a859288c22fb793fad11ec2327e60fcd (diff) | |
| download | linux-7ff2c2a1a71e83f74574b8001ea88deb3c166ad7.tar.bz2 | |
btrfs: Fix bound checking in qgroup_trace_new_subtree_blocks
If 'cur_level' is 7 then the bound checking at the top of the function
will actually pass. Later on, it's possible to dereference
ds_path->nodes[cur_level+1] which will be an out of bounds.
The correct check will be cur_level >= BTRFS_MAX_LEVEL - 1 .
Fixes-coverty-id: 1440918
Fixes-coverty-id: 1440911
Fixes: ea49f3e73c4b ("btrfs: qgroup: Introduce function to find all new tree blocks of reloc tree")
CC: stable@vger.kernel.org # 4.20+
Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/btrfs/qgroup.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/btrfs/qgroup.c b/fs/btrfs/qgroup.c index eb680b715dd6..e659d9d61107 100644 --- a/fs/btrfs/qgroup.c +++ b/fs/btrfs/qgroup.c @@ -1922,8 +1922,8 @@ static int qgroup_trace_new_subtree_blocks(struct btrfs_trans_handle* trans, int i; /* Level sanity check */ - if (cur_level < 0 || cur_level >= BTRFS_MAX_LEVEL || - root_level < 0 || root_level >= BTRFS_MAX_LEVEL || + if (cur_level < 0 || cur_level >= BTRFS_MAX_LEVEL - 1 || + root_level < 0 || root_level >= BTRFS_MAX_LEVEL - 1 || root_level < cur_level) { btrfs_err_rl(fs_info, "%s: bad levels, cur_level=%d root_level=%d", |