From: <gregkh@linuxfoundation.org>
To: tsgatesv@gmail.com, adilger@dilger.ca,
gregkh@linuxfoundation.org, tytso@mit.edu
Cc: <stable@vger.kernel.org>, <stable-commits@vger.kernel.org>
Subject: Patch "jbd2: fix incorrect unlock on j_list_lock" has been added to the 4.8-stable tree
Date: Wed, 26 Oct 2016 13:59:58 +0200 [thread overview]
Message-ID: <1477483198197150@kroah.com> (raw)
This is a note to let you know that I've just added the patch titled
jbd2: fix incorrect unlock on j_list_lock
to the 4.8-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
jbd2-fix-incorrect-unlock-on-j_list_lock.patch
and it can be found in the queue-4.8 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.
>From 559cce698eaf4ccecb2213b2519ea3a0413e5155 Mon Sep 17 00:00:00 2001
From: Taesoo Kim <tsgatesv@gmail.com>
Date: Wed, 12 Oct 2016 23:19:18 -0400
Subject: jbd2: fix incorrect unlock on j_list_lock
From: Taesoo Kim <tsgatesv@gmail.com>
commit 559cce698eaf4ccecb2213b2519ea3a0413e5155 upstream.
When 'jh->b_transaction == transaction' (asserted by below)
J_ASSERT_JH(jh, (jh->b_transaction == transaction || ...
'journal->j_list_lock' will be incorrectly unlocked, since
the the lock is aquired only at the end of if / else-if
statements (missing the else case).
Signed-off-by: Taesoo Kim <tsgatesv@gmail.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Reviewed-by: Andreas Dilger <adilger@dilger.ca>
Fixes: 6e4862a5bb9d12be87e4ea5d9a60836ebed71d28
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
fs/jbd2/transaction.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/fs/jbd2/transaction.c
+++ b/fs/jbd2/transaction.c
@@ -1149,6 +1149,7 @@ int jbd2_journal_get_create_access(handl
JBUFFER_TRACE(jh, "file as BJ_Reserved");
spin_lock(&journal->j_list_lock);
__jbd2_journal_file_buffer(jh, transaction, BJ_Reserved);
+ spin_unlock(&journal->j_list_lock);
} else if (jh->b_transaction == journal->j_committing_transaction) {
/* first access by this transaction */
jh->b_modified = 0;
@@ -1156,8 +1157,8 @@ int jbd2_journal_get_create_access(handl
JBUFFER_TRACE(jh, "set next transaction");
spin_lock(&journal->j_list_lock);
jh->b_next_transaction = transaction;
+ spin_unlock(&journal->j_list_lock);
}
- spin_unlock(&journal->j_list_lock);
jbd_unlock_bh_state(bh);
/*
Patches currently in stable-queue which might be from tsgatesv@gmail.com are
queue-4.8/jbd2-fix-incorrect-unlock-on-j_list_lock.patch
reply other threads:[~2016-10-26 12:01 UTC|newest]
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