malloc the temp array used for sorting in .compile().

For large sets, workspace could be too small.

src/vmod_selector.c

@@ -355,11 +355,9 @@ VCL_VOID
 vmod_set_compile(VRT_CTX, struct VPFX(selector_set) *set)
 {
 	char **members;
-	unsigned sz;
 	struct memberidx *idx;
 
 	CHECK_OBJ_NOTNULL(ctx, VRT_CTX_MAGIC);
-	CHECK_OBJ_NOTNULL(ctx->ws, WS_MAGIC);
 	CHECK_OBJ_NOTNULL(set, VMOD_SELECTOR_SET_MAGIC);
 
 	if ((ctx->method & VCL_MET_INIT) == 0) {
@@ -380,13 +378,11 @@ vmod_set_compile(VRT_CTX, struct VPFX(selector_set) *set)
 		return;
 	}
 
-	sz = WS_ReserveSize(ctx->ws, sizeof(*idx) * set->nmembers);
-	if (sz == 0) {
-		VFAIL(ctx, "%s.compile(): insufficient workspace",
-		      set->vcl_name);
+	idx = malloc(set->nmembers * sizeof(*idx));
+	if (idx == NULL) {
+		VFAIL(ctx, "%s.compile(): out of memory", set->vcl_name);
 		return;
 	}
-	idx = (struct memberidx *)WS_Front(ctx->ws);
 	for (unsigned i = 0; i < set->nmembers; i++) {
 		idx[i].n = i;
 		idx[i].member = members[i];
@@ -402,11 +398,11 @@ vmod_set_compile(VRT_CTX, struct VPFX(selector_set) *set)
 				VFAIL(ctx, "%s.compile(\"%s\") failed: %s",
 				      set->vcl_name, members[i],
 				      strerror(errno));
-			WS_Release(ctx->ws, sz);
+			free(idx);
 			return;
 		}
 	}
-	WS_Release(ctx->ws, sz);
+	free(idx);
 
 	errno = 0;
 	if ((set->hash = PH_Generate(members, set->nmembers)) == NULL) {