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| author | Liu Bo <bo.liu@linux.alibaba.com> | 2018-04-02 19:59:47 +0200 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2018-04-05 19:22:17 +0200 |
| commit | 80c0b4210a963e31529e15bf90519708ec947596 (patch) | |
| tree | 526c3e6f1bdc12aabf541687a992c806576aaa5b /fs/btrfs/tree-log.c | |
| parent | btrfs: lift errors from add_extent_changeset to the callers (diff) | |
| download | linux-80c0b4210a963e31529e15bf90519708ec947596.tar.xz linux-80c0b4210a963e31529e15bf90519708ec947596.zip | |
Btrfs: fix NULL pointer dereference in log_dir_items
0, 1 and <0 can be returned by btrfs_next_leaf(), and when <0 is
returned, path->nodes[0] could be NULL, log_dir_items lacks such a
check for <0 and we may run into a null pointer dereference panic.
Fixes: e02119d5a7b4 ("Btrfs: Add a write ahead tree log to optimize synchronous operations")
Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: Liu Bo <bo.liu@linux.alibaba.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to '')
| -rw-r--r-- | fs/btrfs/tree-log.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/fs/btrfs/tree-log.c b/fs/btrfs/tree-log.c index c91babc6aa4b..c6bfa86e2f22 100644 --- a/fs/btrfs/tree-log.c +++ b/fs/btrfs/tree-log.c @@ -3520,8 +3520,11 @@ static noinline int log_dir_items(struct btrfs_trans_handle *trans, * from this directory and from this transaction */ ret = btrfs_next_leaf(root, path); - if (ret == 1) { - last_offset = (u64)-1; + if (ret) { + if (ret == 1) + last_offset = (u64)-1; + else + err = ret; goto done; } btrfs_item_key_to_cpu(path->nodes[0], &tmp, path->slots[0]); |