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Tsirkin" , Jason Wang , Paolo Bonzini , Stefan Hajnoczi , =?UTF-8?q?Eugenio=20P=C3=A9rez?= , virtualization@lists.linux.dev, kvm@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Jia Jia Subject: [PATCH] vhost-scsi: do not count PI bytes in the data length Date: Tue, 6 Oct 2026 16:21:02 +0800 Message-Id: <20261006082102.27085-1-physicalmtea@gmail.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit vhost_scsi_handle_vq() moves pi_bytesout and pi_bytesin into the protection sgl and subtracts them from exp_data_len. The length passed to TCM is still exp_data_len + prot_bytes. That sum matched an older target path which subtracted prot_length again. sbc_check_prot() now replaces data_length from the CDB only when the protect field is non-zero, and only for READ and WRITE. target_cmd_size_check() leaves a write's data_length unchanged when the CDB size is smaller. MODE SELECT, SET TARGET PORT GROUPS and UNMAP then use data_length as the size of t_data_sg. The PI bytes are not in that sgl. A parameter list that ends on a page is followed by a read of the next physical page. Pass the data sgl length. Protected READ and WRITE still take their length from the CDB. KASAN reports: BUG: KASAN: use-after-free in spc_emulate_modeselect+0x145/0x380 [target_core_mod] Read of size 1 spc_emulate_modeselect __target_execute_cmd target_execute_cmd vhost_scsi_write_pending transport_generic_new_cmd __target_submit target_queued_submit_work process_one_work worker_thread kthread ret_from_fork ret_from_fork_asm Fixes: 9f977ef7b671 ("vhost-scsi: Include prot_bytes into expected data transfer length") Signed-off-by: Jia Jia --- diff --git a/drivers/vhost/scsi.c b/drivers/vhost/scsi.c index 4f8c0260bc9e..4bd29c2ceed9 100644 --- a/drivers/vhost/scsi.c +++ b/drivers/vhost/scsi.c @@ -1534,9 +1534,13 @@ vhost_scsi_handle_vq(struct vhost_scsi *vs, struct vhost_virtqueue *vq) * vhost_scsi_queue_data_in() and vhost_scsi_queue_status() */ cmd->tvc_vq_desc = vc.head; + /* + * exp_data_len is the data sgl. prot_bytes already sit in + * the protection sgl. Protected READ and WRITE replace + * data_length from the CDB in sbc_check_prot(). + */ vhost_scsi_target_queue_cmd(nexus, cmd, cdb, lun, task_attr, - data_direction, - exp_data_len + prot_bytes); + data_direction, exp_data_len); ret = 0; err: /*