[PATCH 18/29] btrfs: Fix race in btrfs_free_dummy_fs_info()

From: Matthew Wilcox
Date: Wed Nov 16 2016 - 17:30:08 EST


From: Matthew Wilcox <mawilcox@xxxxxxxxxxxxx>

We drop the lock which protects the radix tree, so we must call
radix_tree_iter_next() in order to avoid a modification to the tree
invalidating the iterator state.

Signed-off-by: Matthew Wilcox <mawilcox@xxxxxxxxxxxxx>
---
fs/btrfs/tests/btrfs-tests.c | 1 +
1 file changed, 1 insertion(+)

diff --git a/fs/btrfs/tests/btrfs-tests.c b/fs/btrfs/tests/btrfs-tests.c
index bf62ad9..73076a0 100644
--- a/fs/btrfs/tests/btrfs-tests.c
+++ b/fs/btrfs/tests/btrfs-tests.c
@@ -162,6 +162,7 @@ void btrfs_free_dummy_fs_info(struct btrfs_fs_info *fs_info)
slot = radix_tree_iter_retry(&iter);
continue;
}
+ slot = radix_tree_iter_next(&iter);
spin_unlock(&fs_info->buffer_lock);
free_extent_buffer_stale(eb);
spin_lock(&fs_info->buffer_lock);
--
2.10.2