From: Rui Xiang <rui.xiang@huawei.com>
Date: Tue, 12 Nov 2013 23:06:55 +0000 (-0800)
Subject: ocfs2: add necessary check in case sb_getblk() fails
X-Git-Tag: accepted/tizen/common/20141203.182822~1142^2~259
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=58796207cf09552706b0c3e0669f2ce52ea6cee1;p=platform%2Fkernel%2Flinux-arm64.git

ocfs2: add necessary check in case sb_getblk() fails

sb_getblk() may return an err, so add a check for bh.

[joseph.qi@huawei.com: also add a check after calling sb_getblk() in ocfs2_create_xattr_block()]
Signed-off-by: Rui Xiang <rui.xiang@huawei.com>
Reviewed-by: Jie Liu <jeff.liu@oracle.com>
Reviewed-by: Mark Fasheh <mfasheh@suse.de>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Joseph Qi <joseph.qi@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/fs/ocfs2/refcounttree.c b/fs/ocfs2/refcounttree.c
index 70d083e..55767e1 100644
--- a/fs/ocfs2/refcounttree.c
+++ b/fs/ocfs2/refcounttree.c
@@ -612,6 +612,11 @@ static int ocfs2_create_refcount_tree(struct inode *inode,
 	}
 
 	new_bh = sb_getblk(inode->i_sb, first_blkno);
+	if (!new_bh) {
+		ret = -ENOMEM;
+		mlog_errno(ret);
+		goto out_commit;
+	}
 	ocfs2_set_new_buffer_uptodate(&new_tree->rf_ci, new_bh);
 
 	ret = ocfs2_journal_access_rb(handle, &new_tree->rf_ci, new_bh,
diff --git a/fs/ocfs2/xattr.c b/fs/ocfs2/xattr.c
index 8225729..f0a1326 100644
--- a/fs/ocfs2/xattr.c
+++ b/fs/ocfs2/xattr.c
@@ -2864,6 +2864,12 @@ static int ocfs2_create_xattr_block(struct inode *inode,
 	}
 
 	new_bh = sb_getblk(inode->i_sb, first_blkno);
+	if (!new_bh) {
+		ret = -ENOMEM;
+		mlog_errno(ret);
+		goto end;
+	}
+
 	ocfs2_set_new_buffer_uptodate(INODE_CACHE(inode), new_bh);
 
 	ret = ocfs2_journal_access_xb(ctxt->handle, INODE_CACHE(inode),