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 7f6a0d288f02f7a514ff6d75894c5ec3379d17a6..1d31ffb5d78939096b9d3f32d9580361e622e09a 100644 (file)
--- 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;