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[94.39.191.51]) by smtp.gmail.com with ESMTPSA id f21sm3258597wra.5.2017.06.15.03.53.20 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 15 Jun 2017 03:53:20 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=sender:from:to:subject:date:message-id:in-reply-to:references; bh=G3HUEhYN0C992nHDeCLjnL4Xp6wgCCube3ooaO+rH3g=; b=mdHpBlMYljIhetyk8FuYD5ZhPhWssEqxg2lI9A0llCU4Lu5b9LAq6AAxQ2Egz8et3Q M4Q9c/6zIDbof1k00o9eD1V/q3YvvBjKbRZuAoxsa8wIKPwMWEiO5499SxJHhlu1oG22 gepqZUP0BBxEYQaOVdEAdWHHzgWjhU0/xj2qaRU4owNbNyLmXfj+fYUeLGnOPl/UE1pK //zJ0MMrzSQa0JNkiq1+ZomLL5n52RjcbyGxD85dWeNujAwCsfD8GbThCfUi0betUep2 KC4dfp7pz4vMd1eHWGOkcO6FX759xoRpHWOdHkML3TwE8u/mjj+9uLTrRStd3ShMwsg0 qZrg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:from:to:subject:date:message-id :in-reply-to:references; bh=G3HUEhYN0C992nHDeCLjnL4Xp6wgCCube3ooaO+rH3g=; b=VmADPJqmzK2OG1lCrKlaePoBvIL9YTAATdLrGlJsETQc9Lc5i47JjUP75uY5UaWLUl RJYgHBkRLbRmSjCKVOtPWD2JHZsGSqZGSDMGX4W2ZrNm7BWfnF37DuthWXkwFTeaZ44/ jchqudn62h01xbg+T27IoUEThB4P3JMYpX2mtJIrtFT+oJT78jOiIRYBLwq4n9mKIez/ zLAlQdxEY4AeeySStAnq4Vi1QaWRn2L6L0agjPaoGywxR29sD57kYiEkTxu34sGyNjQq JkENKuCXlmspENSqZ9gbhPz77xKawRGcWbA84g4UgnGq6W1Eu9vKF6ST7OWD2ZvI6t1G bYag== X-Gm-Message-State: AKS2vOytJD80ZYqmOmofr7ncIrVGLcepk+/Ftp+929j+2GGJW3POALpV vLVes7dQDR5b63HE44E= X-Received: by 10.223.141.146 with SMTP id o18mr449265wrb.110.1497524001110; Thu, 15 Jun 2017 03:53:21 -0700 (PDT) From: Paolo Bonzini To: qemu-devel@nongnu.org Date: Thu, 15 Jun 2017 12:52:30 +0200 Message-Id: <1497523981-38449-11-git-send-email-pbonzini@redhat.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1497523981-38449-1-git-send-email-pbonzini@redhat.com> References: <1497523981-38449-1-git-send-email-pbonzini@redhat.com> X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 2a00:1450:400c:c0c::241 Subject: [Qemu-devel] [PULL 10/41] megasas: do not read DCMD opcode more than once from frame 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: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) X-ZohoMail: RDKM_2 RSF_0 Z_629925259 SPT_0 Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Avoid TOC-TOU bugs by storing the DCMD opcode in the MegasasCmd Signed-off-by: Paolo Bonzini --- hw/scsi/megasas.c | 25 +++++++++++-------------- 1 file changed, 11 insertions(+), 14 deletions(-) diff --git a/hw/scsi/megasas.c b/hw/scsi/megasas.c index c353118..a3f75c1 100644 --- a/hw/scsi/megasas.c +++ b/hw/scsi/megasas.c @@ -63,6 +63,7 @@ typedef struct MegasasCmd { =20 hwaddr pa; hwaddr pa_size; + uint32_t dcmd_opcode; union mfi_frame *frame; SCSIRequest *req; QEMUSGList qsg; @@ -513,6 +514,7 @@ static MegasasCmd *megasas_enqueue_frame(MegasasState *= s, cmd->context &=3D (uint64_t)0xFFFFFFFF; } cmd->count =3D count; + cmd->dcmd_opcode =3D -1; s->busy++; =20 if (s->consumer_pa) { @@ -1562,22 +1564,21 @@ static const struct dcmd_cmd_tbl_t { =20 static int megasas_handle_dcmd(MegasasState *s, MegasasCmd *cmd) { - int opcode; int retval =3D 0; size_t len; const struct dcmd_cmd_tbl_t *cmdptr =3D dcmd_cmd_tbl; =20 - opcode =3D le32_to_cpu(cmd->frame->dcmd.opcode); - trace_megasas_handle_dcmd(cmd->index, opcode); + cmd->dcmd_opcode =3D le32_to_cpu(cmd->frame->dcmd.opcode); + trace_megasas_handle_dcmd(cmd->index, cmd->dcmd_opcode); if (megasas_map_dcmd(s, cmd) < 0) { return MFI_STAT_MEMORY_NOT_AVAILABLE; } - while (cmdptr->opcode !=3D -1 && cmdptr->opcode !=3D opcode) { + while (cmdptr->opcode !=3D -1 && cmdptr->opcode !=3D cmd->dcmd_opcode)= { cmdptr++; } len =3D cmd->iov_size; if (cmdptr->opcode =3D=3D -1) { - trace_megasas_dcmd_unhandled(cmd->index, opcode, len); + trace_megasas_dcmd_unhandled(cmd->index, cmd->dcmd_opcode, len); retval =3D megasas_dcmd_dummy(s, cmd); } else { trace_megasas_dcmd_enter(cmd->index, cmdptr->desc, len); @@ -1592,13 +1593,11 @@ static int megasas_handle_dcmd(MegasasState *s, Meg= asasCmd *cmd) static int megasas_finish_internal_dcmd(MegasasCmd *cmd, SCSIRequest *req) { - int opcode; int retval =3D MFI_STAT_OK; int lun =3D req->lun; =20 - opcode =3D le32_to_cpu(cmd->frame->dcmd.opcode); - trace_megasas_dcmd_internal_finish(cmd->index, opcode, lun); - switch (opcode) { + trace_megasas_dcmd_internal_finish(cmd->index, cmd->dcmd_opcode, lun); + switch (cmd->dcmd_opcode) { case MFI_DCMD_PD_GET_INFO: retval =3D megasas_pd_get_info_submit(req->dev, lun, cmd); break; @@ -1606,7 +1605,7 @@ static int megasas_finish_internal_dcmd(MegasasCmd *c= md, retval =3D megasas_ld_get_info_submit(req->dev, lun, cmd); break; default: - trace_megasas_dcmd_internal_invalid(cmd->index, opcode); + trace_megasas_dcmd_internal_invalid(cmd->index, cmd->dcmd_opcode); retval =3D MFI_STAT_INVALID_DCMD; break; } @@ -1827,7 +1826,6 @@ static void megasas_xfer_complete(SCSIRequest *req, u= int32_t len) { MegasasCmd *cmd =3D req->hba_private; uint8_t *buf; - uint32_t opcode; =20 trace_megasas_io_complete(cmd->index, len); =20 @@ -1837,8 +1835,7 @@ static void megasas_xfer_complete(SCSIRequest *req, u= int32_t len) } =20 buf =3D scsi_req_get_buf(req); - opcode =3D le32_to_cpu(cmd->frame->dcmd.opcode); - if (opcode =3D=3D MFI_DCMD_PD_GET_INFO && cmd->iov_buf) { + if (cmd->dcmd_opcode =3D=3D MFI_DCMD_PD_GET_INFO && cmd->iov_buf) { struct mfi_pd_info *info =3D cmd->iov_buf; =20 if (info->inquiry_data[0] =3D=3D 0x7f) { @@ -1849,7 +1846,7 @@ static void megasas_xfer_complete(SCSIRequest *req, u= int32_t len) memcpy(info->vpd_page83, buf, len); } scsi_req_continue(req); - } else if (opcode =3D=3D MFI_DCMD_LD_GET_INFO) { + } else if (cmd->dcmd_opcode =3D=3D MFI_DCMD_LD_GET_INFO) { struct mfi_ld_info *info =3D cmd->iov_buf; =20 if (cmd->iov_buf) { --=20 1.8.3.1