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From: Paolo Bonzini <pbonzini@redhat.com>
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Date: Thu, 1 Jun 2017 17:26:14 +0200
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Subject: [PATCH] megasas: always store SCSIRequest* into MegasasCmd
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This ensures that the request is unref'ed properly, and avoids a
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segmentation fault in the new qtest testcase that is added.
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This is CVE-2017-9503.
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Reported-by: Zhangyanyu <zyy4013@stu.ouc.edu.cn>
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Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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(cherry picked from commit 87e459a810d7b1ec1638085b5a80ea3d9b43119a)
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---
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hw/scsi/megasas.c | 31 ++++++++++++++++---------------
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1 file changed, 16 insertions(+), 15 deletions(-)
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diff --git a/hw/scsi/megasas.c b/hw/scsi/megasas.c
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index 135662df31..734fdaef90 100644
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--- a/hw/scsi/megasas.c
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+++ b/hw/scsi/megasas.c
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@@ -609,6 +609,9 @@ static void megasas_reset_frames(MegasasState *s)
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static void megasas_abort_command(MegasasCmd *cmd)
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{
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/* Never abort internal commands. */
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+ if (cmd->dcmd_opcode != -1) {
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+ return;
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+ }
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if (cmd->req != NULL) {
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scsi_req_cancel(cmd->req);
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}
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@@ -1017,7 +1020,6 @@ static int megasas_pd_get_info_submit(SCSIDevice *sdev, int lun,
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uint64_t pd_size;
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uint16_t pd_id = ((sdev->id & 0xFF) << 8) | (lun & 0xFF);
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uint8_t cmdbuf[6];
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- SCSIRequest *req;
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size_t len, resid;
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if (!cmd->iov_buf) {
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@@ -1026,8 +1028,8 @@ static int megasas_pd_get_info_submit(SCSIDevice *sdev, int lun,
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info->inquiry_data[0] = 0x7f; /* Force PQual 0x3, PType 0x1f */
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info->vpd_page83[0] = 0x7f;
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megasas_setup_inquiry(cmdbuf, 0, sizeof(info->inquiry_data));
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- req = scsi_req_new(sdev, cmd->index, lun, cmdbuf, cmd);
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- if (!req) {
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+ cmd->req = scsi_req_new(sdev, cmd->index, lun, cmdbuf, cmd);
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+ if (!cmd->req) {
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trace_megasas_dcmd_req_alloc_failed(cmd->index,
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"PD get info std inquiry");
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g_free(cmd->iov_buf);
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@@ -1036,26 +1038,26 @@ static int megasas_pd_get_info_submit(SCSIDevice *sdev, int lun,
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}
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trace_megasas_dcmd_internal_submit(cmd->index,
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"PD get info std inquiry", lun);
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- len = scsi_req_enqueue(req);
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+ len = scsi_req_enqueue(cmd->req);
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if (len > 0) {
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cmd->iov_size = len;
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- scsi_req_continue(req);
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+ scsi_req_continue(cmd->req);
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}
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return MFI_STAT_INVALID_STATUS;
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} else if (info->inquiry_data[0] != 0x7f && info->vpd_page83[0] == 0x7f) {
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megasas_setup_inquiry(cmdbuf, 0x83, sizeof(info->vpd_page83));
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- req = scsi_req_new(sdev, cmd->index, lun, cmdbuf, cmd);
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- if (!req) {
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+ cmd->req = scsi_req_new(sdev, cmd->index, lun, cmdbuf, cmd);
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+ if (!cmd->req) {
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trace_megasas_dcmd_req_alloc_failed(cmd->index,
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"PD get info vpd inquiry");
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return MFI_STAT_FLASH_ALLOC_FAIL;
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}
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trace_megasas_dcmd_internal_submit(cmd->index,
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"PD get info vpd inquiry", lun);
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- len = scsi_req_enqueue(req);
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+ len = scsi_req_enqueue(cmd->req);
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if (len > 0) {
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cmd->iov_size = len;
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- scsi_req_continue(req);
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+ scsi_req_continue(cmd->req);
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}
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return MFI_STAT_INVALID_STATUS;
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}
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@@ -1217,7 +1219,6 @@ static int megasas_ld_get_info_submit(SCSIDevice *sdev, int lun,
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struct mfi_ld_info *info = cmd->iov_buf;
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size_t dcmd_size = sizeof(struct mfi_ld_info);
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uint8_t cdb[6];
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- SCSIRequest *req;
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ssize_t len, resid;
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uint16_t sdev_id = ((sdev->id & 0xFF) << 8) | (lun & 0xFF);
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uint64_t ld_size;
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@@ -1226,8 +1227,8 @@ static int megasas_ld_get_info_submit(SCSIDevice *sdev, int lun,
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cmd->iov_buf = g_malloc0(dcmd_size);
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info = cmd->iov_buf;
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megasas_setup_inquiry(cdb, 0x83, sizeof(info->vpd_page83));
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- req = scsi_req_new(sdev, cmd->index, lun, cdb, cmd);
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- if (!req) {
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+ cmd->req = scsi_req_new(sdev, cmd->index, lun, cdb, cmd);
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+ if (!cmd->req) {
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trace_megasas_dcmd_req_alloc_failed(cmd->index,
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"LD get info vpd inquiry");
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g_free(cmd->iov_buf);
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@@ -1236,10 +1237,10 @@ static int megasas_ld_get_info_submit(SCSIDevice *sdev, int lun,
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}
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trace_megasas_dcmd_internal_submit(cmd->index,
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"LD get info vpd inquiry", lun);
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- len = scsi_req_enqueue(req);
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+ len = scsi_req_enqueue(cmd->req);
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if (len > 0) {
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cmd->iov_size = len;
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- scsi_req_continue(req);
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+ scsi_req_continue(cmd->req);
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}
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return MFI_STAT_INVALID_STATUS;
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}
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@@ -1851,7 +1852,7 @@ static void megasas_command_complete(SCSIRequest *req, uint32_t status,
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return;
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}
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- if (cmd->req == NULL) {
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+ if (cmd->dcmd_opcode != -1) {
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/*
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* Internal command complete
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*/
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