linux-ext4 - [PATCH] jbd: Check return value of _

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Date:	Wed, 13 Oct 2010 17:17:18 +0900
From:	Namhyung Kim <namhyung@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>, Jan Kara <jack@...e.cz>
Cc:	linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] jbd: Check return value of __getblk()

Fail journal creation if __getblk() returns NULL.  unlikely() is
added because it is called in a loop and we've been OK without
the check until now.

Signed-off-by: Namhyung Kim <namhyung@...il.com>
---
 fs/jbd/journal.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/fs/jbd/journal.c b/fs/jbd/journal.c
index 7fee247..3290fe9 100644
--- a/fs/jbd/journal.c
+++ b/fs/jbd/journal.c
@@ -950,6 +950,8 @@ int journal_create(journal_t *journal)
 		if (err)
 			return err;
 		bh = __getblk(journal->j_dev, blocknr, journal->j_blocksize);
+		if (unlikely(!bh))
+			return -ENOMEM;
 		lock_buffer(bh);
 		memset (bh->b_data, 0, journal->j_blocksize);
 		BUFFER_TRACE(bh, "marking dirty");
-- 
1.7.0.4

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