[PATCH 5.15 094/159] ksmbd: fix uninitialized pointer read in smb2_create_link()

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

5.15-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Namjae Jeon <linkinjeon@kernel.org>

[ Upstream commit df14afeed2e6c1bbadef7d2f9c46887bbd6d8d94 ]

There is a case that file_present is true and path is uninitialized.
This patch change file_present is set to false by default and set to
true when patch is initialized.

Fixes: 74d7970febf7 ("ksmbd: fix racy issue from using ->d_parent and ->d_name")
Reported-by: Coverity Scan <scan-admin@coverity.com>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 fs/ksmbd/smb2pdu.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

--- a/fs/ksmbd/smb2pdu.c
+++ b/fs/ksmbd/smb2pdu.c
@@ -5529,7 +5529,7 @@ static int smb2_create_link(struct ksmbd
 {
 	char *link_name = NULL, *target_name = NULL, *pathname = NULL;
 	struct path path;
-	bool file_present = true;
+	bool file_present = false;
 	int rc;
 
 	if (buf_len < (u64)sizeof(struct smb2_file_link_info) +
@@ -5562,8 +5562,8 @@ static int smb2_create_link(struct ksmbd
 	if (rc) {
 		if (rc != -ENOENT)
 			goto out;
-		file_present = false;
-	}
+	} else
+		file_present = true;
 
 	if (file_info->ReplaceIfExists) {
 		if (file_present) {