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| author |   Qu Wenruo <wqu@suse.com> | 2018-08-01 10:37:20 +0800 |
|---|---|---|
| committer |   David Sterba <dsterba@suse.com> | 2018-08-06 13:13:03 +0200 |
| commit | 64f64f43c89aca1782aa672e0586f6903c5d8979 (patch) | |
| tree | faf9455a54d072d1ba33ece10942f4ead8e5b477 /fs/btrfs | |
| parent | btrfs: Introduce mount time chunk <-> dev extent mapping check (diff) | |
| download | linux-dev-64f64f43c89aca1782aa672e0586f6903c5d8979.tar.xz linux-dev-64f64f43c89aca1782aa672e0586f6903c5d8979.zip | |
btrfs: Exit gracefully when chunk map cannot be inserted to the tree
It's entirely possible that a crafted btrfs image contains overlapping
chunks.
Although we can't detect such problem by tree-checker, it's not a
catastrophic problem, current extent map can already detect such problem
and return -EEXIST.
We just only need to exit gracefully and fail the mount.
Reported-by: Xu Wen <wen.xu@gatech.edu>
Link: https://bugzilla.kernel.org/show_bug.cgi?id=200409
Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs')
| -rw-r--r-- | fs/btrfs/volumes.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c index 96be1e50b027..7218a79a0e57 100644 --- a/fs/btrfs/volumes.c +++ b/fs/btrfs/volumes.c @@ -6489,10 +6489,14 @@ static int read_one_chunk(struct btrfs_fs_info *fs_info, struct btrfs_key *key, write_lock(&map_tree->map_tree.lock); ret = add_extent_mapping(&map_tree->map_tree, em, 0); write_unlock(&map_tree->map_tree.lock); - BUG_ON(ret); /* Tree corruption */ + if (ret < 0) { + btrfs_err(fs_info, + "failed to add chunk map, start=%llu len=%llu: %d", + em->start, em->len, ret); + } free_extent_map(em); - return 0; + return ret; } static void fill_device_from_item(struct extent_buffer *leaf, |