From b44a2b6790b04621c14de176757a09193699bc37 Mon Sep 17 00:00:00 2001
From: Sagi Grimberg <sagig@mellanox.com>
Date: Mon, 26 Jan 2015 12:49:08 +0200
Subject: iser-target: Fix wrong allocation in the case of an empty text
 message

if text message dlength is 0, don't allocate a buffer for it, pass
NULL to iscsit_process_text_cmd.

Signed-off-by: Sagi Grimberg <sagig@mellanox.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

diff --git a/drivers/infiniband/ulp/isert/ib_isert.c b/drivers/infiniband/ulp/isert/ib_isert.c
index 7f6a0d2..1d31ffb 100644
--- a/drivers/infiniband/ulp/isert/ib_isert.c
+++ b/drivers/infiniband/ulp/isert/ib_isert.c
@@ -1351,17 +1351,19 @@ isert_handle_text_cmd(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd
 	struct iscsi_conn *conn = isert_conn->conn;
 	u32 payload_length = ntoh24(hdr->dlength);
 	int rc;
-	unsigned char *text_in;
+	unsigned char *text_in = NULL;
 
 	rc = iscsit_setup_text_cmd(conn, cmd, hdr);
 	if (rc < 0)
 		return rc;
 
-	text_in = kzalloc(payload_length, GFP_KERNEL);
-	if (!text_in) {
-		isert_err("Unable to allocate text_in of payload_length: %u\n",
-			  payload_length);
-		return -ENOMEM;
+	if (payload_length) {
+		text_in = kzalloc(payload_length, GFP_KERNEL);
+		if (!text_in) {
+			isert_err("Unable to allocate text_in of payload_length: %u\n",
+				  payload_length);
+			return -ENOMEM;
+		}
 	}
 	cmd->text_in_ptr = text_in;
 
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