linux-kernel - [PATCH 3.16 353/357] ext4: avoid trying to kfree an ERR

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Message-Id: <20141003212944.061183410@linuxfoundation.org>
Date:	Fri,  3 Oct 2014 14:32:19 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Theodore Tso <tytso@....edu>
Subject: [PATCH 3.16 353/357] ext4: avoid trying to kfree an ERR_PTR pointer

3.16-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Theodore Ts'o <tytso@....edu>

commit a9cfcd63e8d206ce4235c355d857c4fbdf0f4587 upstream.

Thanks to Dan Carpenter for extending smatch to find bugs like this.
(This was found using a development version of smatch.)

Fixes: 36de928641ee48b2078d3fe9514242aaa2f92013
Reported-by: Dan Carpenter <dan.carpenter@...cle.com
Signed-off-by: Theodore Ts'o <tytso@....edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/ext4/namei.c  |    2 ++
 fs/ext4/resize.c |    2 ++
 2 files changed, 4 insertions(+)

--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -3240,6 +3240,7 @@ static int ext4_rename(struct inode *old
 				 &new.de, &new.inlined);
 	if (IS_ERR(new.bh)) {
 		retval = PTR_ERR(new.bh);
+		new.bh = NULL;
 		goto end_rename;
 	}
 	if (new.bh) {
@@ -3386,6 +3387,7 @@ static int ext4_cross_rename(struct inod
 				 &new.de, &new.inlined);
 	if (IS_ERR(new.bh)) {
 		retval = PTR_ERR(new.bh);
+		new.bh = NULL;
 		goto end_rename;
 	}
 
--- a/fs/ext4/resize.c
+++ b/fs/ext4/resize.c
@@ -575,6 +575,7 @@ handle_bb:
 		bh = bclean(handle, sb, block);
 		if (IS_ERR(bh)) {
 			err = PTR_ERR(bh);
+			bh = NULL;
 			goto out;
 		}
 		overhead = ext4_group_overhead_blocks(sb, group);
@@ -603,6 +604,7 @@ handle_ib:
 		bh = bclean(handle, sb, block);
 		if (IS_ERR(bh)) {
 			err = PTR_ERR(bh);
+			bh = NULL;
 			goto out;
 		}
 


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