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From: Alexander Motin <mav@FreeBSD.org>
Date: Tue, 28 Feb 2017 05:17:51 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
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Subject: svn commit: r314374 - head/sys/dev/firewire
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Author: mav
Date: Tue Feb 28 05:17:50 2017
New Revision: 314374
URL: https://svnweb.freebsd.org/changeset/base/314374

Log:
  Add safety check against too long CDB.
  
  SBP-2 specification defined maximum CDB length as 12 bytes.  Newer SBP-3
  specification allows CDB of any size, but this driver is too old.  Proper
  solution would be to look on maximal ORB size supported by the target.
  
  MFC after:	1 week

Modified:
  head/sys/dev/firewire/sbp.c

Modified: head/sys/dev/firewire/sbp.c
==============================================================================
--- head/sys/dev/firewire/sbp.c	Tue Feb 28 05:14:42 2017	(r314373)
+++ head/sys/dev/firewire/sbp.c	Tue Feb 28 05:17:50 2017	(r314374)
@@ -2367,6 +2367,11 @@ END_DEBUG
 			xpt_done(ccb);
 			return;
 		}
+		if (csio->cdb_len > sizeof(ocb->orb) - 5 * sizeof(uint32_t)) {
+			ccb->ccb_h.status = CAM_REQ_INVALID;
+			xpt_done(ccb);
+			return;
+		}
 #if 0
 		/* if we are in probe stage, pass only probe commands */
 		if (sdev->status == SBP_DEV_PROBE) {