target: Fix trailing ASCII space usage in INQUIRY vendor+model

commit ee60bddba5a5f23e39598195d944aa0eb2d455e5 upstream.

This patch fixes spc_emulate_inquiry_std() to add trailing ASCII
spaces for INQUIRY vendor + model fields following SPC-4 text:

  "ASCII data fields described as being left-aligned shall have any
   unused bytes at the end of the field (i.e., highest offset) and
   the unused bytes shall be filled with ASCII space characters (20h)."

This addresses a problem with Falconstor NSS multipathing.

Reported-by: Tomas Molota <tomas.molota@lightstorm.sk>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/target/target_core_spc.c b/drivers/target/target_core_spc.c
index 4cb667d720a74e18584199454ce0b7af548fe802..9fabbf7214cd70cc3d4ad3e1bfa74f7ac516cdd0 100644 (file)
--- a/drivers/target/target_core_spc.c
+++ b/drivers/target/target_core_spc.c
@@ -97,9 +97,12 @@ spc_emulate_inquiry_std(struct se_cmd *cmd, unsigned char *buf)
 
        buf[7] = 0x2; /* CmdQue=1 */
 
-       snprintf(&buf[8], 8, "LIO-ORG");
-       snprintf(&buf[16], 16, "%s", dev->t10_wwn.model);
-       snprintf(&buf[32], 4, "%s", dev->t10_wwn.revision);
+       memcpy(&buf[8], "LIO-ORG ", 8);
+       memset(&buf[16], 0x20, 16);
+       memcpy(&buf[16], dev->t10_wwn.model,
+              min_t(size_t, strlen(dev->t10_wwn.model), 16));
+       memcpy(&buf[32], dev->t10_wwn.revision,
+              min_t(size_t, strlen(dev->t10_wwn.revision), 4));
        buf[4] = 31; /* Set additional length to 31 */
 
        return 0;