[PATCH 029/104] target: Fix trailing ASCII space usage in INQUIRY vendor+model

[Luis Henriques]

3.5.7.22 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>

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@xxxxxxxxxxxxx>
Signed-off-by: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
[ luis: backported to 3.5:
  - file rename: target_core_spc.c -> target_core_cdb.c
  - use dev->se_sub_dev->t10_wwn instead of dev->t10_wwn ]
Signed-off-by: Luis Henriques <luis.henriques@xxxxxxxxxxxxx>
---
 drivers/target/target_core_cdb.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/target/target_core_cdb.c b/drivers/target/target_core_cdb.c
index dd09f0f..1756838 100644
--- a/drivers/target/target_core_cdb.c
+++ b/drivers/target/target_core_cdb.c
@@ -97,9 +97,12 @@ target_emulate_inquiry_std(struct se_cmd *cmd, char *buf)
 
 	buf[7] = 0x2; /* CmdQue=1 */
 
-	snprintf(&buf[8], 8, "LIO-ORG");
-	snprintf(&buf[16], 16, "%s", dev->se_sub_dev->t10_wwn.model);
-	snprintf(&buf[32], 4, "%s", dev->se_sub_dev->t10_wwn.revision);
+	memcpy(&buf[8], "LIO-ORG ", 8);
+	memset(&buf[16], 0x20, 16);
+	memcpy(&buf[16], dev->se_sub_dev->t10_wwn.model,
+	       min_t(size_t, strlen(dev->se_sub_dev->t10_wwn.model), 16));
+	memcpy(&buf[32], dev->se_sub_dev->t10_wwn.revision,
+	       min_t(size_t, strlen(dev->se_sub_dev->t10_wwn.revision), 4));
 	buf[4] = 31; /* Set additional length to 31 */
 
 	return 0;
-- 
1.8.3.2

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