From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Coverity Scan <scan-admin@coverity.com>,
        Hyunchul Lee <hyc.lee@gmail.com>,
        Namjae Jeon <linkinjeon@kernel.org>,
        Steve French <stfrench@microsoft.com>
Subject: [PATCH 5.15 046/179] ksmbd: fix memleak in get_file_stream_info()
Date:   Mon, 29 Nov 2021 19:17:20 +0100
Message-Id: <20211129181720.487852046@linuxfoundation.org>
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From: Namjae Jeon <linkinjeon@kernel.org>

commit 178ca6f85aa3231094467691f5ea1ff2f398aa8d upstream.

Fix memleak in get_file_stream_info()

Fixes: 34061d6b76a4 ("ksmbd: validate OutputBufferLength of QUERY_DIR, QUERY_INFO, IOCTL requests")
Cc: stable@vger.kernel.org # v5.15
Reported-by: Coverity Scan <scan-admin@coverity.com>
Acked-by: Hyunchul Lee <hyc.lee@gmail.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 |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/fs/ksmbd/smb2pdu.c
+++ b/fs/ksmbd/smb2pdu.c
@@ -4489,8 +4489,10 @@ static void get_file_stream_info(struct
 				     ":%s", &stream_name[XATTR_NAME_STREAM_LEN]);
 
 		next = sizeof(struct smb2_file_stream_info) + streamlen * 2;
-		if (next > buf_free_len)
+		if (next > buf_free_len) {
+			kfree(stream_buf);
 			break;
+		}
 
 		file_info = (struct smb2_file_stream_info *)&rsp->Buffer[nbytes];
 		streamlen  = smbConvertToUTF16((__le16 *)file_info->StreamName,