From: Catherine <whitequark@whitequark.org>
Date: Tue, 14 Dec 2021 16:27:37 +0000 (+0000)
Subject: Fix null pointer dereference after failing to extract DFF from memory.
X-Git-Tag: yosys-0.13~24^2~1
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=48ed6d998bb2943891acd730c4aaef5d1deecb7e;p=yosys.git

Fix null pointer dereference after failing to extract DFF from memory.

Fixes #3110.
---

diff --git a/kernel/mem.cc b/kernel/mem.cc
index 746f667ea..96168ff76 100644
--- a/kernel/mem.cc
+++ b/kernel/mem.cc
@@ -985,7 +985,8 @@ Cell *Mem::extract_rdff(int idx, FfInitVals *initvals) {
 		c = ff.emit();
 	}
 
-	log("Extracted %s FF from read port %d of %s.%s: %s\n", trans_use_addr ? "addr" : "data",
+	if (c)
+		log("Extracted %s FF from read port %d of %s.%s: %s\n", trans_use_addr ? "addr" : "data",
 			idx, log_id(module), log_id(memid), log_id(c));
 
 	port.en = State::S1;