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[133.130.103.189]) by smtp.gmail.com with ESMTPSA id r74sm17819361pfb.67.2017.02.17.00.28.09 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 17 Feb 2017 00:28:13 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=3lwYUi+tew54WZg1BLaZjxHbTi1KbuqNZCn68PGlvw4=; b=Z2xN/CYhCa9zjoCv5xxWYcuydXgMWGMOhGy6JkISfxQk4hgH5pikl4DE4flTtz9T+9 bcKV3/6dF1zGXGhI9CX5byHm6qwzHFQo7JX+AsysScpeA+cgkdW4wO5v+jol7n1lyuxv PzgSN1QnJReEpskJ1aFYZIyn3mMeWNu6qIK6WIcLOwqydkxL50h0YJdmKhGuD6tXv3lD aYdOpIVuj1qcWLtpwwZy7jNaAxrtbJltOHiykeQeJSpG17AS5mXL5U1sRfhJDS3WvaA+ TaT5ccRIw9Ac+3X5YpMVm0HArY02CumYM9nllCEbu2IFDnqGSjkTQaSQYdn7pdVLgXd+ c2LA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=3lwYUi+tew54WZg1BLaZjxHbTi1KbuqNZCn68PGlvw4=; b=R/Kn6TrpXAtH244eeyylpx8hlCLrtVa9GDkBqij5bzRfnL5UiUtlBTfKqNxYzp1r+9 gmiar7yrLgVsrfx2XY7ejYjQ55+qHf+l/QdOlMxbGO3DER7twtIMPuJ41I4j8f2I5PMl rM0PqFj5RwLBlbr7SveOYKfTWkvkVFsL7PIEcC/X3aWg/aid1Io80Bd3gALfz2hTykUI HTUoJQ4Y2EwNYiCHe5QDLnDrsz1rhUTtjPiuH8je3GyORZbThXcdfVsfuZ87gE7h6E5D tKalWs7Q1+b4RAzDi88bThITk2cCwLYTznDNy8bnjSOFaEfqGs+ele0qM10WC5d96ghO gDXQ== X-Gm-Message-State: AMke39m0QFATfMFZkBR+IULuHrY31leOvkDiEydlzgfGbI0GaoUV/ZdIFAyHjH58mR/xXg== X-Received: by 10.84.195.1 with SMTP id i1mr9353615pld.77.1487320093579; Fri, 17 Feb 2017 00:28:13 -0800 (PST) From: Ziyue Yang To: qemu-devel@nongnu.org Date: Fri, 17 Feb 2017 16:27:04 +0800 Message-Id: <20170217082704.23270-3-skiver.cloud.yzy@gmail.com> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20170217082704.23270-1-skiver.cloud.yzy@gmail.com> References: <20170217082704.23270-1-skiver.cloud.yzy@gmail.com> X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 2607:f8b0:400e:c00::244 Subject: [Qemu-devel] [PATCH 2/2] target/i386/monitor.c: check return value of mon_get_cpu before using it X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Ziyue Yang , Ziyue Yang , "Dr . David Alan Gilbert" , Pavel Butsykin Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail: RSF_0 Z_629925259 SPT_0 Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" From: Ziyue Yang This patch eliminates the segfault caused by accessing CPU that doesn't exist in hmp command "info lapic", which can be reproduced by $ qemu-system-x86_64 -nographic -M none -serial none -monitor stdio and then type "info lapic" into qemu monitor. Signed-off-by: Ziyue Yang Reviewed-by: Philippe Mathieu-Daud=C3=A9 --- target/i386/monitor.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/target/i386/monitor.c b/target/i386/monitor.c index 468aa073bc..7b96c74a24 100644 --- a/target/i386/monitor.c +++ b/target/i386/monitor.c @@ -624,8 +624,11 @@ const MonitorDef *target_monitor_defs(void) =20 void hmp_info_local_apic(Monitor *mon, const QDict *qdict) { - x86_cpu_dump_local_apic_state(mon_get_cpu(), (FILE *)mon, monitor_fpri= ntf, - CPU_DUMP_FPU); + CPUState *cs =3D mon_get_cpu(); + if (cs) { + x86_cpu_dump_local_apic_state(cs, (FILE *)mon, monitor_fprintf, + CPU_DUMP_FPU); + } } =20 void hmp_info_io_apic(Monitor *mon, const QDict *qdict) --=20 2.11.0