linux-kernel - [PATCH] nilfs2: fix dereferencing freed memory

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Message-Id: <20230818092022.111054-1-mengferry@linux.alibaba.com>
Date:   Fri, 18 Aug 2023 17:20:22 +0800
From:   Ferry Meng <mengferry@...ux.alibaba.com>
To:     Ryusuke Konishi <konishi.ryusuke@...il.com>,
        linux-nilfs@...r.kernel.org
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Ferry Meng <mengferry@...ux.alibaba.com>
Subject: [PATCH] nilfs2: fix dereferencing freed memory

Fix smatch warning:

fs/nilfs2/gcinode.c:103 nilfs_gccache_submit_read_data() error:
dereferencing freed memory 'bh'

Signed-off-by: Ferry Meng <mengferry@...ux.alibaba.com>

diff --git a/fs/nilfs2/gcinode.c b/fs/nilfs2/gcinode.c
index 48fe71d309cb..6319e825f317 100644
--- a/fs/nilfs2/gcinode.c
+++ b/fs/nilfs2/gcinode.c
@@ -73,10 +73,8 @@ int nilfs_gccache_submit_read_data(struct inode *inode, sector_t blkoff,
 		struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
 
 		err = nilfs_dat_translate(nilfs->ns_dat, vbn, &pbn);
-		if (unlikely(err)) { /* -EIO, -ENOMEM, -ENOENT */
-			brelse(bh);
+		if (unlikely(err)) /* -EIO, -ENOMEM, -ENOENT */
 			goto failed;
-		}
 	}
 
 	lock_buffer(bh);
@@ -102,6 +100,8 @@ int nilfs_gccache_submit_read_data(struct inode *inode, sector_t blkoff,
  failed:
 	unlock_page(bh->b_page);
 	put_page(bh->b_page);
+	if (err)
+		brelse(bh);
 	return err;
 }
 
-- 
2.19.1.6.gb485710b