From: Clement Deschamps <clement.deschamps@greensocs.com>
Date: Tue, 22 Oct 2019 14:00:16 +0000 (+0200)
Subject: translate-all: fix uninitialized tb->orig_tb
X-Git-Url: http://git.osdn.net/view?a=commitdiff_plain;h=1b1940026c95b941d9cf75bd38b37fe3feaa78a7;p=qmiga%2Fqemu.git

translate-all: fix uninitialized tb->orig_tb

This fixes a segmentation fault in icount mode when executing
from an IO region.

TB is marked as CF_NOCACHE but tb->orig_tb is not initialized
(equals previous value in code_gen_buffer).

The issue happens in cpu_io_recompile() when it tries to invalidate orig_tb.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Clement Deschamps <clement.deschamps@greensocs.com>
Message-Id: <20191022140016.918371-1-clement.deschamps@greensocs.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---

diff --git a/accel/tcg/translate-all.c b/accel/tcg/translate-all.c
index 66d4bc4341..f9b7ba159d 100644
--- a/accel/tcg/translate-all.c
+++ b/accel/tcg/translate-all.c
@@ -1722,6 +1722,7 @@ TranslationBlock *tb_gen_code(CPUState *cpu,
     tb->cs_base = cs_base;
     tb->flags = flags;
     tb->cflags = cflags;
+    tb->orig_tb = NULL;
     tb->trace_vcpu_dstate = *cpu->trace_dstate;
     tcg_ctx->tb_cflags = cflags;
  tb_overflow: