linux-kernel - [PATCH 4.20 09/76] staging: erofs: fix memleak of inodes shared xattr array

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Message-Id: <20190308124915.114823190@linuxfoundation.org>
Date:   Fri,  8 Mar 2019 13:49:21 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Sheng Yong <shengyong1@...wei.com>,
        Gao Xiang <gaoxiang25@...wei.com>
Subject: [PATCH 4.20 09/76] staging: erofs: fix memleak of inodes shared xattr array

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

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

From: Sheng Yong <shengyong1@...wei.com>

commit 3b1b5291f79d040d549d7c746669fc30e8045b9b upstream.

If it fails to read a shared xattr page, the inode's shared xattr array
is not freed. The next time the inode's xattr is accessed, the previously
allocated array is leaked.

Signed-off-by: Sheng Yong <shengyong1@...wei.com>
Fixes: b17500a0fdba ("staging: erofs: introduce xattr & acl support")
Cc: <stable@...r.kernel.org> # 4.19+
Reviewed-by: Gao Xiang <gaoxiang25@...wei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/staging/erofs/xattr.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- a/drivers/staging/erofs/xattr.c
+++ b/drivers/staging/erofs/xattr.c
@@ -111,8 +111,11 @@ static int init_inode_xattrs(struct inod
 
 			it.page = erofs_get_meta_page(sb,
 				++it.blkaddr, S_ISDIR(inode->i_mode));
-			if (IS_ERR(it.page))
+			if (IS_ERR(it.page)) {
+				kfree(vi->xattr_shared_xattrs);
+				vi->xattr_shared_xattrs = NULL;
 				return PTR_ERR(it.page);
+			}
 
 			it.kaddr = kmap_atomic(it.page);
 			atomic_map = true;