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redhat.com; dkim=none (message not signed) header.d=none;redhat.com; dmarc=bestguesspass action=none header.from=xilinx.com; Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: Pass (protection.outlook.com: domain of xilinx.com designates 149.199.60.83 as permitted sender) receiver=protection.outlook.com; client-ip=149.199.60.83; helo=xsj-pvapsmtpgw01; From: Sai Pavan Boddu To: =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= , =?UTF-8?q?Daniel=20P=20=2E=20Berrang=C3=A9?= , Eric Blake Subject: [PATCH v2] chardev/char-socket: Properly make qio connections non blocking Date: Sun, 19 Apr 2020 15:21:40 +0530 Message-Id: <1587289900-29485-1-git-send-email-sai.pavan.boddu@xilinx.com> X-Mailer: git-send-email 2.7.4 X-RCIS-Action: ALLOW X-TM-AS-Product-Ver: IMSS-7.1.0.1224-8.2.0.1013-23620.005 X-TM-AS-User-Approved-Sender: Yes;Yes X-EOPAttributedMessage: 0 X-MS-Office365-Filtering-HT: Tenant X-Forefront-Antispam-Report: CIP:149.199.60.83; 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Ip=[149.199.60.83]; Helo=[xsj-pvapsmtpgw01] X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM5PR02MB3356 Received-SPF: pass client-ip=40.107.68.67; envelope-from=saipava@xilinx.com; helo=NAM04-BN3-obe.outbound.protection.outlook.com X-detected-operating-system: by eggs.gnu.org: Windows NT kernel [generic] [fuzzy] X-Received-From: 40.107.68.67 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Paolo Bonzini , edgari@xilinx.com, qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @xilinx.onmicrosoft.com) Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" In tcp_chr_sync_read function, there is a possibility of socket disconnection during blocking read, then tcp_chr_hup function would clean up the qio channel pointers(i.e ioc, sioc). Signed-off-by: Sai Pavan Boddu Reviewed-by: Daniel P. Berrang=C3=A9 --- Changes for V2: Place the guard around 'qio_channel_set_blocking' call to check connection= status This fix is simpler than v1 and explains better about the issue. chardev/char-socket.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/chardev/char-socket.c b/chardev/char-socket.c index 185fe38..e56b2f0 100644 --- a/chardev/char-socket.c +++ b/chardev/char-socket.c @@ -549,7 +549,9 @@ static int tcp_chr_sync_read(Chardev *chr, const uint8_= t *buf, int len) =20 qio_channel_set_blocking(s->ioc, true, NULL); size =3D tcp_chr_recv(chr, (void *) buf, len); - qio_channel_set_blocking(s->ioc, false, NULL); + if (s->state !=3D TCP_CHARDEV_STATE_DISCONNECTED) { + qio_channel_set_blocking(s->ioc, false, NULL); + } if (size =3D=3D 0) { /* connection closed */ tcp_chr_disconnect(chr); --=20 2.7.4