diff --git a/fs/smb/server/smb2pdu.c b/fs/smb/server/smb2pdu.c
index 6d0896c76b09..dab4c7d71091 100644
--- a/fs/smb/server/smb2pdu.c
+++ b/fs/smb/server/smb2pdu.c
@@ -8623,7 +8623,8 @@ int smb3_decrypt_req(struct ksmbd_work *work)
 	struct smb2_transform_hdr *tr_hdr = smb2_get_msg(buf);
 	int rc = 0;
 
-	if (buf_data_size < sizeof(struct smb2_hdr)) {
+	if (pdu_length < sizeof(struct smb2_transform_hdr) ||
+	    buf_data_size < sizeof(struct smb2_hdr)) {
 		pr_err("Transform message is too small (%u)\n",
 		       pdu_length);
 		return -ECONNABORTED;