From 4227f811cdeb4d85db91ea6b9adf9ac049cec12e Mon Sep 17 00:00:00 2001
From: Namjae Jeon <linkinjeon@kernel.org>
Date: Wed, 29 Sep 2021 19:52:51 +0900
Subject: [PATCH] ksmbd: fix transform header validation
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Validate that the transform and smb request headers are present
before checking OriginalMessageSize and SessionId fields.
Cc: Ronnie Sahlberg <ronniesahlberg@gmail.com>
Cc: Ralph Böhme <slow@samba.org>
Cc: Sergey Senozhatsky <senozhatsky@chromium.org>
Reviewed-by: Tom Talpey <tom@talpey.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>
---
fs/ksmbd/smb2pdu.c | 18 +++++++++---------
1 file changed, 9 insertions(+), 9 deletions(-)
diff --git a/fs/ksmbd/smb2pdu.c b/fs/ksmbd/smb2pdu.c
index 99c6349a44fa6..dcf9077386108 100644
--- a/fs/ksmbd/smb2pdu.c
+++ b/fs/ksmbd/smb2pdu.c
@@ -8414,16 +8414,8 @@ int smb3_decrypt_req(struct ksmbd_work *work)
unsigned int buf_data_size = pdu_length + 4 -
sizeof(struct smb2_transform_hdr);
struct smb2_transform_hdr *tr_hdr = (struct smb2_transform_hdr *)buf;
- unsigned int orig_len = le32_to_cpu(tr_hdr->OriginalMessageSize);
int rc = 0;
- sess = ksmbd_session_lookup_all(conn, le64_to_cpu(tr_hdr->SessionId));
- if (!sess) {
- pr_err("invalid session id(%llx) in transform header\n",
- le64_to_cpu(tr_hdr->SessionId));
- return -ECONNABORTED;
- }
-
if (pdu_length + 4 <
sizeof(struct smb2_transform_hdr) + sizeof(struct smb2_hdr)) {
pr_err("Transform message is too small (%u)\n",
@@ -8431,11 +8423,19 @@ int smb3_decrypt_req(struct ksmbd_work *work)
return -ECONNABORTED;
}
- if (pdu_length + 4 < orig_len + sizeof(struct smb2_transform_hdr)) {
+ if (pdu_length + 4 <
+ le32_to_cpu(tr_hdr->OriginalMessageSize) + sizeof(struct smb2_transform_hdr)) {
pr_err("Transform message is broken\n");
return -ECONNABORTED;
}
+ sess = ksmbd_session_lookup_all(conn, le64_to_cpu(tr_hdr->SessionId));
+ if (!sess) {
+ pr_err("invalid session id(%llx) in transform header\n",
+ le64_to_cpu(tr_hdr->SessionId));
+ return -ECONNABORTED;
+ }
+
iov[0].iov_base = buf;
iov[0].iov_len = sizeof(struct smb2_transform_hdr);
iov[1].iov_base = buf + sizeof(struct smb2_transform_hdr);
--
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