linux-ext4 - [PATCH 2/2] jbd2: Fix memory leak in jbd2_journal

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Date:	Wed,  6 May 2015 10:05:14 +0200
From:	Lukas Czerner <lczerner@...hat.com>
To:	tytso@....edu
Cc:	linux-ext4@...r.kernel.org, Lukas Czerner <lczerner@...hat.com>
Subject: [PATCH 2/2] jbd2: Fix memory leak in jbd2_journal_stop()

Currently in the case that we've got to the jbd2_journal_stop() with
already sopped handle we might leak the memory previously allocated
for the reserved handle because we only free the handle structure
leaving handle->h_rsv_handle intact.

Fix it by freeing the handle->h_rsv_handle structure in case we're
dealing with already stopped handle in jbd2_journal_stop().

Signed-off-by: Lukas Czerner <lczerner@...hat.com>
---
 fs/jbd2/transaction.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/fs/jbd2/transaction.c b/fs/jbd2/transaction.c
index 34bd0c5..807c378 100644
--- a/fs/jbd2/transaction.c
+++ b/fs/jbd2/transaction.c
@@ -1535,8 +1535,11 @@ int jbd2_journal_stop(handle_t *handle)
 			jbd_debug(4, "h_ref %d -> %d\n", handle->h_ref + 1,
 							 handle->h_ref);
 			return err;
-		} else
+		} else {
+			if (handle->h_rsv_handle)
+				jbd2_free_handle(handle->h_rsv_handle);
 			goto free_and_exit;
+		}
 	}
 	journal = transaction->t_journal;
 
-- 
1.8.3.1

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