Bugfix reporting pcre2 error messages when workspace is exhausted.

src/vmod_pcre2.c

@@ -214,9 +214,20 @@ report_pcre2_err(VRT_CTX, int errcode, const char * const restrict msg,
 		VERR(ctx, "%s (unknown error code)%s", msg, post);
 	}
 	else if (ret == PCRE2_ERROR_NOMEMORY) {
-		WS_Release(ctx->ws, strlen(buf) + 1);
-		VERR(ctx, "%s: %s (truncated error message)%s", msg, buf,
-		     post);
+		unsigned len = strlen(buf) + 1;
+
+		if (len > bytes) {
+			WS_Release(ctx->ws, 0);
+			ERRNOMEM(ctx, "allocating workspace for pcre2 error "
+				 "message");
+			VERR(ctx, "%s: libpcre2 error code %d%s", msg, errcode,
+			     post);
+		}
+		else {
+			WS_Release(ctx->ws, len);
+			VERR(ctx, "%s: %s (truncated error message)%s", msg,
+			     buf, post);
+		}
 	}
 	else {
 		WS_Release(ctx->ws, ret);