linux-kernel - [PATCH 18/29] btrfs: Fix race in btrfs_free_dummy_fs

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Message-Id: <1479341856-30320-57-git-send-email-mawilcox@linuxonhyperv.com>
Date:   Wed, 16 Nov 2016 16:17:21 -0800
From:   Matthew Wilcox <mawilcox@...uxonhyperv.com>
To:     linux-kernel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Konstantin Khlebnikov <koct9i@...il.com>,
        Ross Zwisler <ross.zwisler@...ux.intel.com>
Cc:     linux-fsdevel@...r.kernel.org,
        Matthew Wilcox <mawilcox@...rosoft.com>, linux-mm@...ck.org,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: [PATCH 18/29] btrfs: Fix race in btrfs_free_dummy_fs_info()

From: Matthew Wilcox <mawilcox@...rosoft.com>

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@...rosoft.com>
---
 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