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Tsirkin" To: qemu-devel@nongnu.org Cc: Peter Maydell , Stefano Garzarella , Daniel P =?utf-8?B?LiBCZXJyYW5nw6k=?= , Philippe =?utf-8?Q?Mathieu-Daud=C3=A9?= , Stefan Hajnoczi , David Hildenbrand Subject: [PULL v3 48/85] libvhost-user: fail vu_message_write() if sendmsg() is failing Message-ID: <92b58bc7e9086e489295040d408118a81c47b31d.1720046570.git.mst@redhat.com> References: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Disposition: inline Content-Transfer-Encoding: quoted-printable In-Reply-To: X-Mailer: git-send-email 2.27.0.106.g8ac3dc51b1 X-Mutt-Fcc: =sent 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 client-ip=170.10.133.124; envelope-from=mst@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1720047228855100005 From: Stefano Garzarella In vu_message_write() we use sendmsg() to send the message header, then a write() to send the payload. If sendmsg() fails we should avoid sending the payload, since we were unable to send the header. Discovered before fixing the issue with the previous patch, where sendmsg() failed on macOS due to wrong parameters, but the frontend still sent the payload which the backend incorrectly interpreted as a wrong header. Reviewed-by: Daniel P. Berrang=C3=A9 Reviewed-by: Philippe Mathieu-Daud=C3=A9 Tested-by: Philippe Mathieu-Daud=C3=A9 Acked-by: Stefan Hajnoczi Reviewed-by: David Hildenbrand Signed-off-by: Stefano Garzarella Message-Id: <20240618100043.144657-4-sgarzare@redhat.com> Reviewed-by: Michael S. Tsirkin Signed-off-by: Michael S. Tsirkin --- subprojects/libvhost-user/libvhost-user.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/subprojects/libvhost-user/libvhost-user.c b/subprojects/libvho= st-user/libvhost-user.c index 53bf1adda6..ea27683dac 100644 --- a/subprojects/libvhost-user/libvhost-user.c +++ b/subprojects/libvhost-user/libvhost-user.c @@ -639,6 +639,11 @@ vu_message_write(VuDev *dev, int conn_fd, VhostUserMsg= *vmsg) rc =3D sendmsg(conn_fd, &msg, 0); } while (rc < 0 && (errno =3D=3D EINTR || errno =3D=3D EAGAIN)); =20 + if (rc <=3D 0) { + vu_panic(dev, "Error while writing: %s", strerror(errno)); + return false; + } + if (vmsg->size) { do { if (vmsg->data) { --=20 MST