linux-kernel - [49/94] btrfs: don't stop searching after encountering the wrong item

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Message-ID: <lsq.1369712993.712451516@decadent.org.uk>
Date:	Tue, 28 May 2013 04:49:53 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org, "Josef Bacik" <jbacik@...ionio.com>,
	"Gabriel de Perthuis" <g2p.code+btrfs@...il.com>,
	"Gabriel de Perthuis" <g2p.code@...il.com>
Subject: [49/94] btrfs: don't stop searching after encountering the wrong item

3.2.46-rc1 review patch.  If anyone has any objections, please let me know.

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

From: Gabriel de Perthuis <g2p.code@...il.com>

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@...il.com>
Signed-off-by: Josef Bacik <jbacik@...ionio.com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 fs/btrfs/ioctl.c |   10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -1571,7 +1571,11 @@ static noinline int copy_to_sk(struct bt
 		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 >
@@ -1580,10 +1584,6 @@ static noinline int copy_to_sk(struct bt
 			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;

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