linux-kernel - [PATCH] [v3] hfs: fix a memleak in hfs_find

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Message-Id: <20240207121202.3142524-1-alexious@zju.edu.cn>
Date: Wed,  7 Feb 2024 20:12:00 +0800
From: Zhipeng Lu <alexious@....edu.cn>
To: alexious@....edu.cn
Cc: Desmond Cheong Zhi Xi <desmondcheongzx@...il.com>,
	Viacheslav Dubeyko <slava@...eyko.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] [v3] hfs: fix a memleak in hfs_find_init

If hfs_find_init succeeds but some other function called after it fails,
the overall cleanup function of hfs_find_init (i.e. hfs_find_exit) will
be called and `fd->search_key` is freed. However, if hfs_find_init fails
and returns an error, neither external nor internal deallocation of
`fd->search_key` is triggered.

This observation suggests that there could be a memleak problem in
hfs_find_init. In this patch, we add the missing deallocation in the
error-handling path (i.e. the default branch of the switch statement) to
prevent such memory leak.

Fixes: b3b2177a2d79 ("hfs: add lock nesting notation to hfs_find_init")
Signed-off-by: Zhipeng Lu <alexious@....edu.cn>
---
Changelog:

v2: Improve commit message to be more clear.
v3: Update commit message.
---
 fs/hfs/bfind.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/hfs/bfind.c b/fs/hfs/bfind.c
index ef9498a6e88a..7aa3b9aba4d1 100644
--- a/fs/hfs/bfind.c
+++ b/fs/hfs/bfind.c
@@ -36,6 +36,7 @@ int hfs_find_init(struct hfs_btree *tree, struct hfs_find_data *fd)
 		mutex_lock_nested(&tree->tree_lock, ATTR_BTREE_MUTEX);
 		break;
 	default:
+		kfree(fd->search_key);
 		return -EINVAL;
 	}
 	return 0;
-- 
2.34.1