linux-kernel - [PATCH 1/4] hfsplus: Unmap the page in the "fail

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Message-Id: <20220809203105.26183-2-fmdefrancesco@gmail.com>
Date:   Tue,  9 Aug 2022 22:31:02 +0200
From:   "Fabio M. De Francesco" <fmdefrancesco@...il.com>
To:     "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        "Fabio M. De Francesco" <fmdefrancesco@...il.com>,
        Ira Weiny <ira.weiny@...el.com>, Jens Axboe <axboe@...nel.dk>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Bart Van Assche <bvanassche@....org>,
        Kees Cook <keescook@...omium.org>,
        Muchun Song <songmuchun@...edance.com>,
        Viacheslav Dubeyko <slava@...eyko.com>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 1/4] hfsplus: Unmap the page in the "fail_page" label

Several paths within hfs_btree_open() jump to the "fail_page" label
where put_page() is called while the page is still mapped.

Call kunmap() to unmap the page soon before put_page().

Cc: Viacheslav Dubeyko <slava@...eyko.com>
Reviewed-by: Ira Weiny <ira.weiny@...el.com>
Signed-off-by: Fabio M. De Francesco <fmdefrancesco@...il.com>
---
 fs/hfsplus/btree.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/hfsplus/btree.c b/fs/hfsplus/btree.c
index 66774f4cb4fd..3a917a9a4edd 100644
--- a/fs/hfsplus/btree.c
+++ b/fs/hfsplus/btree.c
@@ -245,6 +245,7 @@ struct hfs_btree *hfs_btree_open(struct super_block *sb, u32 id)
 	return tree;
 
  fail_page:
+	kunmap(page);
 	put_page(page);
  free_inode:
 	tree->inode->i_mapping->a_ops = &hfsplus_aops;
-- 
2.37.1