[3.5.y.z,extended,stable] Patch "drivers/block/brd.c: fix brd_lookup_page() race" has been added to staging queue

Message ID 1369734701-7334-1-git-send-email-luis.henriques@canonical.com
State New
Headers show

Commit Message

Luis Henriques May 28, 2013, 9:51 a.m.
This is a note to let you know that I have just added a patch titled

    drivers/block/brd.c: fix brd_lookup_page() race

to the linux-3.5.y-queue branch of the 3.5.y.z extended stable tree 
which can be found at:


If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.5.y.z tree, see



From 16b1038e4a5ab8fa141c912b60671c7189cf2d98 Mon Sep 17 00:00:00 2001
From: Brian Behlendorf <behlendorf1@llnl.gov>
Date: Fri, 24 May 2013 15:55:28 -0700
Subject: [PATCH] drivers/block/brd.c: fix brd_lookup_page() race

commit dfd20b2b174d3a9b258ea3b7a35ead33576587b1 upstream.

The index on the page must be set before it is inserted in the radix
tree.  Otherwise there is a small race which can occur during lookup
where the page can be found with the incorrect index.  This will trigger
the BUG_ON() in brd_lookup_page().

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reported-by: Chris Wedgwood <cw@f00f.org>
Cc: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>
 drivers/block/brd.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)



diff --git a/drivers/block/brd.c b/drivers/block/brd.c
index 531ceb3..4e8213a 100644
--- a/drivers/block/brd.c
+++ b/drivers/block/brd.c
@@ -117,13 +117,13 @@  static struct page *brd_insert_page(struct brd_device *brd, sector_t sector)

 	idx = sector >> PAGE_SECTORS_SHIFT;
+	page->index = idx;
 	if (radix_tree_insert(&brd->brd_pages, idx, page)) {
 		page = radix_tree_lookup(&brd->brd_pages, idx);
 		BUG_ON(page->index != idx);
-	} else
-		page->index = idx;
+	}