linux-kernel - [PATCH v2] staging: erofs: fix memleak of inode's shared xattr array

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Date:   Thu, 14 Feb 2019 14:46:36 +0800
From:   Sheng Yong <shengyong1@...wei.com>
To:     <gaoxiang25@...wei.com>, <yuchao0@...wei.com>,
        <gregkh@...uxfoundation.org>
CC:     <linux-erofs@...ts.ozlabs.org>, <devel@...verdev.osuosl.org>,
        <linux-kernel@...r.kernel.org>, <chao@...nel.org>
Subject: [PATCH v2] staging: erofs: fix memleak of inode's shared xattr array

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>
---
v2: * s/node/inode in commit message
    * add prefix `staging:' to the subject
---
 drivers/staging/erofs/xattr.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/staging/erofs/xattr.c b/drivers/staging/erofs/xattr.c
index 80dca6a4adbe..e3f8b904a680 100644
--- a/drivers/staging/erofs/xattr.c
+++ b/drivers/staging/erofs/xattr.c
@@ -92,8 +92,11 @@ static int init_inode_xattrs(struct inode *inode)
 
 			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;
-- 
2.17.1