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From: Gao Xiang <hsiangkao@linux.alibaba.com>
To: linux-erofs@lists.ozlabs.org, Chao Yu <chao@kernel.org>,
	Liu Bo <bo.liu@linux.alibaba.com>
Cc: LKML <linux-kernel@vger.kernel.org>,
	Gao Xiang <hsiangkao@linux.alibaba.com>,
	kernel test robot <lkp@intel.com>,
	Dan Carpenter <dan.carpenter@oracle.com>
Subject: [PATCH] erofs: fix double free of 'copied'
Date: Wed, 25 Aug 2021 20:07:57 +0800	[thread overview]
Message-ID: <20210825120757.11034-1-hsiangkao@linux.alibaba.com> (raw)

Dan reported a new smatch warning [1]
"fs/erofs/inode.c:210 erofs_read_inode() error: double free of 'copied'"

Due to new chunk-based format handling logic, the error path can be
called after kfree(copied).

Set "copied = NULL" after kfree(copied) to fix this.

[1] https://lore.kernel.org/r/202108251030.bELQozR7-lkp@intel.com
Fixes: c5aa903a59db ("erofs: support reading chunk-based uncompressed files")
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
---
 fs/erofs/inode.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/erofs/inode.c b/fs/erofs/inode.c
index 4408929bd6f5..31ac3a73b390 100644
--- a/fs/erofs/inode.c
+++ b/fs/erofs/inode.c
@@ -127,6 +127,7 @@ static struct page *erofs_read_inode(struct inode *inode,
 			/* fill chunked inode summary info */
 			vi->chunkformat = le16_to_cpu(die->i_u.c.format);
 		kfree(copied);
+		copied = NULL;
 		break;
 	case EROFS_INODE_LAYOUT_COMPACT:
 		vi->inode_isize = sizeof(struct erofs_inode_compact);
-- 
2.24.4


WARNING: multiple messages have this Message-ID (diff)
From: Gao Xiang <hsiangkao@linux.alibaba.com>
To: linux-erofs@lists.ozlabs.org, Chao Yu <chao@kernel.org>,
	Liu Bo <bo.liu@linux.alibaba.com>
Cc: LKML <linux-kernel@vger.kernel.org>,
	Dan Carpenter <dan.carpenter@oracle.com>,
	kernel test robot <lkp@intel.com>
Subject: [PATCH] erofs: fix double free of 'copied'
Date: Wed, 25 Aug 2021 20:07:57 +0800	[thread overview]
Message-ID: <20210825120757.11034-1-hsiangkao@linux.alibaba.com> (raw)

Dan reported a new smatch warning [1]
"fs/erofs/inode.c:210 erofs_read_inode() error: double free of 'copied'"

Due to new chunk-based format handling logic, the error path can be
called after kfree(copied).

Set "copied = NULL" after kfree(copied) to fix this.

[1] https://lore.kernel.org/r/202108251030.bELQozR7-lkp@intel.com
Fixes: c5aa903a59db ("erofs: support reading chunk-based uncompressed files")
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
---
 fs/erofs/inode.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/erofs/inode.c b/fs/erofs/inode.c
index 4408929bd6f5..31ac3a73b390 100644
--- a/fs/erofs/inode.c
+++ b/fs/erofs/inode.c
@@ -127,6 +127,7 @@ static struct page *erofs_read_inode(struct inode *inode,
 			/* fill chunked inode summary info */
 			vi->chunkformat = le16_to_cpu(die->i_u.c.format);
 		kfree(copied);
+		copied = NULL;
 		break;
 	case EROFS_INODE_LAYOUT_COMPACT:
 		vi->inode_isize = sizeof(struct erofs_inode_compact);
-- 
2.24.4


             reply	other threads:[~2021-08-25 12:08 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-25 12:07 Gao Xiang [this message]
2021-08-25 12:07 ` [PATCH] erofs: fix double free of 'copied' Gao Xiang
2021-08-25 12:16 ` Chao Yu
2021-08-25 12:16   ` Chao Yu

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