This is a note to let you know that we have just queued up the patch titled
Subject: jbd: fix race in buffer processing in commit code
to the 2.6.27-stable tree. Its filename is
jbd-fix-race-in-buffer-processing-in-commit-code.patch
A git repo of this tree can be found at
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
>From a61d90d75d0f9e86432c45b496b4b0fbf0fd03dc Mon Sep 17 00:00:00 2001
From: Jan Kara <jack@xxxxxxx>
Date: Tue, 9 Jun 2009 16:26:26 -0700
Subject: jbd: fix race in buffer processing in commit code
From: Jan Kara <jack@xxxxxxx>
commit a61d90d75d0f9e86432c45b496b4b0fbf0fd03dc upstream.
In commit code, we scan buffers attached to a transaction. During this
scan, we sometimes have to drop j_list_lock and then we recheck whether
the journal buffer head didn't get freed by journal_try_to_free_buffers().
But checking for buffer_jbd(bh) isn't enough because a new journal head
could get attached to our buffer head. So add a check whether the journal
head remained the same and whether it's still at the same transaction and
list.
This is a nasty bug and can cause problems like memory corruption (use after
free) or trigger various assertions in JBD code (observed).
Signed-off-by: Jan Kara <jack@xxxxxxx>
Cc: <linux-ext4@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>
---
fs/jbd/commit.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
--- a/fs/jbd/commit.c
+++ b/fs/jbd/commit.c
@@ -238,7 +238,7 @@ write_out_data:
spin_lock(&journal->j_list_lock);
}
/* Someone already cleaned up the buffer? */
- if (!buffer_jbd(bh)
+ if (!buffer_jbd(bh) || bh2jh(bh) != jh
|| jh->b_transaction != commit_transaction
|| jh->b_jlist != BJ_SyncData) {
jbd_unlock_bh_state(bh);
@@ -463,7 +463,9 @@ void journal_commit_transaction(journal_
spin_lock(&journal->j_list_lock);
continue;
}
- if (buffer_jbd(bh) && jh->b_jlist == BJ_Locked) {
+ if (buffer_jbd(bh) && bh2jh(bh) == jh &&
+ jh->b_transaction == commit_transaction &&
+ jh->b_jlist == BJ_Locked) {
__journal_unfile_buffer(jh);
jbd_unlock_bh_state(bh);
journal_remove_journal_head(bh);
Patches currently in stable-queue which might be from jack@xxxxxxx are
queue-2.6.27/jbd-fix-race-in-buffer-processing-in-commit-code.patch
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