linux-kernel - [PATCH] adfs: obj.file_id is uninitialized if __adfs_dir

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Message-Id: <20190829053528.15702-1-yzhai003@ucr.edu>
Date:   Wed, 28 Aug 2019 22:35:28 -0700
From:   Yizhuo <yzhai003@....edu>
To:     unlisted-recipients:; (no To-header on input)
Cc:     csong@...ucr.edu, zhiyunq@...ucr.edu, Yizhuo <yzhai003@....edu>,
        linux-kernel@...r.kernel.org
Subject: [PATCH] adfs: obj.file_id is uninitialized if __adfs_dir_get() returns error code

Inside function adfs_dir_find_entry(), obj.file_id could be uninitialized
if __adfs_dir_get() returns error code. However, the return check cannot
promise the initialization of obj.file_id, which is used in the if
statement. This is potentially unsafe.

Signed-off-by: Yizhuo <yzhai003@....edu>
---
 fs/adfs/dir_f.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/adfs/dir_f.c b/fs/adfs/dir_f.c
index 0fbfd0b04ae0..d7fc47598e78 100644
--- a/fs/adfs/dir_f.c
+++ b/fs/adfs/dir_f.c
@@ -335,7 +335,7 @@ adfs_dir_find_entry(struct adfs_dir *dir, unsigned long object_id)
 	ret = -ENOENT;
 
 	for (pos = 5; pos < ADFS_NUM_DIR_ENTRIES * 26 + 5; pos += 26) {
-		struct object_info obj;
+		struct object_info obj = {};
 
 		if (!__adfs_dir_get(dir, pos, &obj))
 			break;
-- 
2.17.1