diff options
| author | void0red | 2022-11-23 22:39:45 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman | 2023-01-07 11:11:38 +0100 |
| commit | 169a4cf46882974d4db6d85eb623ec898e51bbc0 (patch) | |
| tree | 195191505d37c0d2aa0cabab58ab6ab6f6826577 | |
| parent | 712b0938166a68b7685ef7ce911a52051ba21329 (diff) | |
btrfs: fix extent map use-after-free when handling missing device in read_one_chunk
commit 1742e1c90c3da344f3bb9b1f1309b3f47482756a upstream.
Store the error code before freeing the extent_map. Though it's
reference counted structure, in that function it's the first and last
allocation so this would lead to a potential use-after-free.
The error can happen eg. when chunk is stored on a missing device and
the degraded mount option is missing.
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=216721
Reported-by: eriri <1527030098@qq.com>
Fixes: adfb69af7d8c ("btrfs: add_missing_dev() should return the actual error")
CC: stable@vger.kernel.org # 4.9+
Signed-off-by: void0red <void0red@gmail.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | fs/btrfs/volumes.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c index 635f45f1a2ef..dba087ad40ea 100644 --- a/fs/btrfs/volumes.c +++ b/fs/btrfs/volumes.c @@ -7241,8 +7241,9 @@ static int read_one_chunk(struct btrfs_key *key, struct extent_buffer *leaf, map->stripes[i].dev = handle_missing_device(fs_info, devid, uuid); if (IS_ERR(map->stripes[i].dev)) { + ret = PTR_ERR(map->stripes[i].dev); free_extent_map(em); - return PTR_ERR(map->stripes[i].dev); + return ret; } } |