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authorRobbie Ko <robbieko@synology.com>2016-10-07 17:30:47 +0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-01-06 10:40:10 +0100
commit26dc52465f0df557d154ab59f8567431d4876671 (patch)
treee92a60220ed7999e1bd6767d88d29592d38490e1
parent664b053c53638f9a7b9f129d65182268fb504bf0 (diff)
Btrfs: fix tree search logic when replaying directory entry deletes
commit 2a7bf53f577e49c43de4ffa7776056de26db65d9 upstream. If a log tree has a layout like the following: leaf N: ... item 240 key (282 DIR_LOG_ITEM 0) itemoff 8189 itemsize 8 dir log end 1275809046 leaf N + 1: item 0 key (282 DIR_LOG_ITEM 3936149215) itemoff 16275 itemsize 8 dir log end 18446744073709551615 ... When we pass the value 1275809046 + 1 as the parameter start_ret to the function tree-log.c:find_dir_range() (done by replay_dir_deletes()), we end up with path->slots[0] having the value 239 (points to the last item of leaf N, item 240). Because the dir log item in that position has an offset value smaller than *start_ret (1275809046 + 1) we need to move on to the next leaf, however the logic for that is wrong since it compares the current slot to the number of items in the leaf, which is smaller and therefore we don't lookup for the next leaf but instead we set the slot to point to an item that does not exist, at slot 240, and we later operate on that slot which has unexpected content or in the worst case can result in an invalid memory access (accessing beyond the last page of leaf N's extent buffer). So fix the logic that checks when we need to lookup at the next leaf by first incrementing the slot and only after to check if that slot is beyond the last item of the current leaf. Signed-off-by: Robbie Ko <robbieko@synology.com> Reviewed-by: Filipe Manana <fdmanana@suse.com> Fixes: e02119d5a7b4 (Btrfs: Add a write ahead tree log to optimize synchronous operations) Signed-off-by: Filipe Manana <fdmanana@suse.com> [Modified changelog for clarity and correctness] Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--fs/btrfs/tree-log.c3
1 files changed, 1 insertions, 2 deletions
diff --git a/fs/btrfs/tree-log.c b/fs/btrfs/tree-log.c
index 23dc153cf60b..b89004513c09 100644
--- a/fs/btrfs/tree-log.c
+++ b/fs/btrfs/tree-log.c
@@ -1940,12 +1940,11 @@ static noinline int find_dir_range(struct btrfs_root *root,
next:
/* check the next slot in the tree to see if it is a valid item */
nritems = btrfs_header_nritems(path->nodes[0]);
+ path->slots[0]++;
if (path->slots[0] >= nritems) {
ret = btrfs_next_leaf(root, path);
if (ret)
goto out;
- } else {
- path->slots[0]++;
}
btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);