ksmbd: fix uninitialized pointer read in smb2_create_link()

commit df14afeed2e6c1bbadef7d2f9c46887bbd6d8d94 upstream.

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>

diff --git a/fs/ksmbd/smb2pdu.c b/fs/ksmbd/smb2pdu.c
index 1d365eb79c3ef0ed69d413020383cf8595ce414d..9610b8a884d0e85c14c346038e239e2da8649e0b 100644 (file)
--- a/fs/ksmbd/smb2pdu.c
+++ b/fs/ksmbd/smb2pdu.c
@@ -5560,7 +5560,7 @@ static int smb2_create_link(struct ksmbd_work *work,
 {
        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) +
@@ -5593,8 +5593,8 @@ static int smb2_create_link(struct ksmbd_work *work,
        if (rc) {
                if (rc != -ENOENT)
                        goto out;
-               file_present = false;
-       }
+       } else
+               file_present = true;
 
        if (file_info->ReplaceIfExists) {
                if (file_present) {