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Index: head/sys/geom/geom_ctl.c
===================================================================
--- head/sys/geom/geom_ctl.c
+++ head/sys/geom/geom_ctl.c
@@ -139,6 +139,12 @@
char *p;
u_int i;
+ if (req->narg > 2048) {
+ gctl_error(req, "too many arguments");
+ req->arg = NULL;
+ return;
+ }
+
ap = geom_alloc_copyin(req, req->arg, req->narg * sizeof(*ap));
if (ap == NULL) {
gctl_error(req, "bad control request");

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