linux-kernel - [PATCH] udf: fix an uninitialized read bug

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Date:   Mon, 15 Apr 2019 10:26:24 -0500
From:   Wenwen Wang <wang6495@....edu>
To:     Wenwen Wang <wang6495@....edu>
Cc:     Jan Kara <jack@...e.com>, linux-kernel@...r.kernel.org (open list)
Subject: [PATCH] udf: fix an uninitialized read bug

In udf_lookup(), the pointer 'fi' is a local variable initialized by the
return value of the function call udf_find_entry(). However, if the macro
'UDF_RECOVERY' is defined, this variable will become uninitialized if the
else branch is not taken, which can potentially cause incorrect results in
the following execution.

This patch simply initializes this local pointer to NULL.

Signed-off-by: Wenwen Wang <wang6495@....edu>
---
 fs/udf/namei.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/udf/namei.c b/fs/udf/namei.c
index 58cc241..9d499e1 100644
--- a/fs/udf/namei.c
+++ b/fs/udf/namei.c
@@ -299,7 +299,7 @@ static struct dentry *udf_lookup(struct inode *dir, struct dentry *dentry,
 	struct inode *inode = NULL;
 	struct fileIdentDesc cfi;
 	struct udf_fileident_bh fibh;
-	struct fileIdentDesc *fi;
+	struct fileIdentDesc *fi = NULL;

 	if (dentry->d_name.len > UDF_NAME_LEN)
 		return ERR_PTR(-ENAMETOOLONG);
-- 
2.7.4