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Tsirkin" To: qemu-devel@nongnu.org Cc: Peter Maydell , Christian =?utf-8?Q?P=C3=B6tzsch?= Subject: [PULL 10/46] Fix vhost user assertion when sending more than one fd Message-ID: <1fc2bf2d1fc50c78515b1484b4d578bfb373df54.1717527933.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, T_SCC_BODY_TEXT_LINE=-0.01 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: 1717528042066100005 From: Christian P=C3=B6tzsch If the client sends more than one region this assert triggers. The reason is that two fd's are 8 bytes and VHOST_MEMORY_BASELINE_NREGIONS is exactly 8. The assert is wrong because it should not test for the size of the fd array, but for the numbers of regions. Signed-off-by: Christian P=C3=B6tzsch Message-Id: <20240426083313.3081272-1-christian.poetzsch@kernkonzept.com> Reviewed-by: Michael S. Tsirkin Signed-off-by: Michael S. Tsirkin --- subprojects/libvhost-user/libvhost-user.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/subprojects/libvhost-user/libvhost-user.c b/subprojects/libvho= st-user/libvhost-user.c index a879149fef..8adb277d54 100644 --- a/subprojects/libvhost-user/libvhost-user.c +++ b/subprojects/libvhost-user/libvhost-user.c @@ -568,7 +568,7 @@ vu_message_read_default(VuDev *dev, int conn_fd, VhostU= serMsg *vmsg) if (cmsg->cmsg_level =3D=3D SOL_SOCKET && cmsg->cmsg_type =3D=3D S= CM_RIGHTS) { fd_size =3D cmsg->cmsg_len - CMSG_LEN(0); vmsg->fd_num =3D fd_size / sizeof(int); - assert(fd_size < VHOST_MEMORY_BASELINE_NREGIONS); + assert(vmsg->fd_num <=3D VHOST_MEMORY_BASELINE_NREGIONS); memcpy(vmsg->fds, CMSG_DATA(cmsg), fd_size); break; } --=20 MST