Author: markj
Date: Wed Feb 20 17:07:08 2019
New Revision: 344365
URL: https://svnweb.freebsd.org/changeset/base/344365

Log:
  Define a constant for the maximum number of GEOM_CTL arguments.
  
  Reviewed by:  eugen
  MFC with:     r344305
  Sponsored by: The FreeBSD Foundation
  Differential Revision:        https://reviews.freebsd.org/D19271

Modified:
  head/sys/geom/geom_ctl.c
  head/sys/geom/geom_ctl.h

Modified: head/sys/geom/geom_ctl.c
==============================================================================
--- head/sys/geom/geom_ctl.c    Wed Feb 20 17:05:13 2019        (r344364)
+++ head/sys/geom/geom_ctl.c    Wed Feb 20 17:07:08 2019        (r344365)
@@ -139,7 +139,7 @@ gctl_copyin(struct gctl_req *req)
        char *p;
        u_int i;
 
-       if (req->narg > 2048) {
+       if (req->narg > GEOM_CTL_ARG_MAX) {
                gctl_error(req, "too many arguments");
                req->arg = NULL;
                return;

Modified: head/sys/geom/geom_ctl.h
==============================================================================
--- head/sys/geom/geom_ctl.h    Wed Feb 20 17:05:13 2019        (r344364)
+++ head/sys/geom/geom_ctl.h    Wed Feb 20 17:07:08 2019        (r344365)
@@ -78,7 +78,8 @@ struct gctl_req {
 
 #define GEOM_CTL       _IOW('G', GCTL_VERSION, struct gctl_req)
 
-#define PATH_GEOM_CTL  "geom.ctl"
+#define GEOM_CTL_ARG_MAX 2048  /* maximum number of parameters */
 
+#define PATH_GEOM_CTL  "geom.ctl"
 
 #endif /* _GEOM_GEOM_CTL_H_ */
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