[PATCH 04/70] btrfs: don't stop searching after encountering the wrong item

From: Luis Henriques
Date: Tue Jun 04 2013 - 10:29:03 EST


3.5.7.14 -stable review patch. If anyone has any objections, please let me know.

------------------

From: Gabriel de Perthuis <g2p.code@xxxxxxxxx>

commit 03b71c6ca6286625d8f1ed44aabab9b5bf5dac10 upstream.

The search ioctl skips items that are too large for a result buffer, but
inline items of a certain size occuring before any search result is
found would trigger an overflow and stop the search entirely.

Bug: https://bugzilla.kernel.org/show_bug.cgi?id=57641

Signed-off-by: Gabriel de Perthuis <g2p.code+btrfs@xxxxxxxxx>
Signed-off-by: Josef Bacik <jbacik@xxxxxxxxxxxx>
Signed-off-by: Luis Henriques <luis.henriques@xxxxxxxxxxxxx>
---
fs/btrfs/ioctl.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 0e92e57..baa4a40 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -1665,7 +1665,11 @@ static noinline int copy_to_sk(struct btrfs_root *root,
item_off = btrfs_item_ptr_offset(leaf, i);
item_len = btrfs_item_size_nr(leaf, i);

- if (item_len > BTRFS_SEARCH_ARGS_BUFSIZE)
+ btrfs_item_key_to_cpu(leaf, key, i);
+ if (!key_in_sk(key, sk))
+ continue;
+
+ if (sizeof(sh) + item_len > BTRFS_SEARCH_ARGS_BUFSIZE)
item_len = 0;

if (sizeof(sh) + item_len + *sk_offset >
@@ -1674,10 +1678,6 @@ static noinline int copy_to_sk(struct btrfs_root *root,
goto overflow;
}

- btrfs_item_key_to_cpu(leaf, key, i);
- if (!key_in_sk(key, sk))
- continue;
-
sh.objectid = key->objectid;
sh.offset = key->offset;
sh.type = key->type;
--
1.8.1.2

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