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@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>
diff --git a/fs/jbd/journal.c b/fs/jbd/journal.c
index e561176..ac18404 100644
--- a/fs/jbd/journal.c
+++ b/fs/jbd/journal.c
@@ -952,6 +952,8 @@
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");