qla2xxx: Fix stale pointer access.

[ Upstream Commit 84e32a06f4f8756ce9ec3c8dc7e97896575f0771 ]

Commit 84e32a0 ("qla2xxx: Use pci_enable_msix_range() instead of
pci_enable_msix()") introduced a regression when target mode is enabled.
In qla24xx_enable_msix(), ha->max_rsp_queues was incorrectly set
to a value higher than the number of response queues allocated causing
an invalid dereference. Specifically here in qla2x00_init_rings():
    *rsp->in_ptr = 0;

Add additional check to make sure the pointer is valid. following
call stack will be seen

---- 8< ----
RIP: 0010:[<ffffffffa02ccadc>]  [<ffffffffa02ccadc>] qla2x00_init_rings+0xdc/0x320 [qla2xxx]
RSP: 0018:ffff880429447dd8  EFLAGS: 00010082
....
Call Trace:
[<ffffffffa02ceb40>] qla2x00_abort_isp+0x170/0x6b0 [qla2xxx]
[<ffffffffa02c6f77>] qla2x00_do_dpc+0x357/0x7f0 [qla2xxx]
[<ffffffffa02c6c20>] ? qla2x00_relogin+0x260/0x260 [qla2xxx]
[<ffffffff8107d2c9>] kthread+0xc9/0xe0
[<ffffffff8107d200>] ? flush_kthread_worker+0x90/0x90
[<ffffffff8172cc6f>] ret_from_fork+0x3f/0x70
[<ffffffff8107d200>] ? flush_kthread_worker+0x90/0x90
---- 8< ----

Cc: <stable@vger.kernel.org>
Signed-off-by: Quinn Tran <quinn.tran@qlogic.com>
Signed-off-by: Himanshu Madhani <himanshu.madhani@qlogic.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

5 files changed, 31 insertions, 9 deletions

diff --git a/drivers/scsi/qla2xxx/qla_init.c b/drivers/scsi/qla2xxx/qla_init.c
index 52a87657c7dd..692a7570b5e1 100644
--- a/drivers/scsi/qla2xxx/qla_init.c
+++ b/drivers/scsi/qla2xxx/qla_init.c
@@ -2204,7 +2204,7 @@ qla2x00_init_rings(scsi_qla_host_t *vha)
         /* Clear outstanding commands array. */
         for (que = 0; que < ha->max_req_queues; que++) {
                 req = ha->req_q_map[que];
-                if (!req)
+                if (!req || !test_bit(que, ha->req_qid_map))
                         continue;
                 req->out_ptr = (void *)(req->ring + req->length);
                 *req->out_ptr = 0;
@@ -2221,7 +2221,7 @@ qla2x00_init_rings(scsi_qla_host_t *vha)
 
         for (que = 0; que < ha->max_rsp_queues; que++) {
                 rsp = ha->rsp_q_map[que];
-                if (!rsp)
+                if (!rsp || !test_bit(que, ha->rsp_qid_map))
                         continue;
                 rsp->in_ptr = (void *)(rsp->ring + rsp->length);
                 *rsp->in_ptr = 0;
@@ -4981,7 +4981,7 @@ qla25xx_init_queues(struct qla_hw_data *ha)
 
         for (i = 1; i < ha->max_rsp_queues; i++) {
                 rsp = ha->rsp_q_map[i];
-                if (rsp) {
+                if (rsp && test_bit(i, ha->rsp_qid_map)) {
                         rsp->options &= ~BIT_0;
                         ret = qla25xx_init_rsp_que(base_vha, rsp);
                         if (ret != QLA_SUCCESS)
@@ -4996,8 +4996,8 @@ qla25xx_init_queues(struct qla_hw_data *ha)
         }
         for (i = 1; i < ha->max_req_queues; i++) {
                 req = ha->req_q_map[i];
-                if (req) {
-                /* Clear outstanding commands array. */
+                if (req && test_bit(i, ha->req_qid_map)) {
+                        /* Clear outstanding commands array. */
                         req->options &= ~BIT_0;
                         ret = qla25xx_init_req_que(base_vha, req);
                         if (ret != QLA_SUCCESS)
diff --git a/drivers/scsi/qla2xxx/qla_isr.c b/drivers/scsi/qla2xxx/qla_isr.c
index d4d65eb0e9b4..4af95479a9db 100644
--- a/drivers/scsi/qla2xxx/qla_isr.c
+++ b/drivers/scsi/qla2xxx/qla_isr.c
@@ -3063,9 +3063,9 @@ qla24xx_enable_msix(struct qla_hw_data *ha, struct rsp_que *rsp)
                     "MSI-X: Failed to enable support "
                     "-- %d/%d\n Retry with %d vectors.\n",
                     ha->msix_count, ret, ret);
+                ha->msix_count = ret;
+                ha->max_rsp_queues = ha->msix_count - 1;
         }
-        ha->msix_count = ret;
-        ha->max_rsp_queues = ha->msix_count - 1;
         ha->msix_entries = kzalloc(sizeof(struct qla_msix_entry) *
                                 ha->msix_count, GFP_KERNEL);
         if (!ha->msix_entries) {
diff --git a/drivers/scsi/qla2xxx/qla_mid.c b/drivers/scsi/qla2xxx/qla_mid.c
index c5dd594f6c31..cf7ba52bae66 100644
--- a/drivers/scsi/qla2xxx/qla_mid.c
+++ b/drivers/scsi/qla2xxx/qla_mid.c
@@ -600,7 +600,7 @@ qla25xx_delete_queues(struct scsi_qla_host *vha)
         /* Delete request queues */
         for (cnt = 1; cnt < ha->max_req_queues; cnt++) {
                 req = ha->req_q_map[cnt];
-                if (req) {
+                if (req && test_bit(cnt, ha->req_qid_map)) {
                         ret = qla25xx_delete_req_que(vha, req);
                         if (ret != QLA_SUCCESS) {
                                 ql_log(ql_log_warn, vha, 0x00ea,
@@ -614,7 +614,7 @@ qla25xx_delete_queues(struct scsi_qla_host *vha)
         /* Delete response queues */
         for (cnt = 1; cnt < ha->max_rsp_queues; cnt++) {
                 rsp = ha->rsp_q_map[cnt];
-                if (rsp) {
+                if (rsp && test_bit(cnt, ha->rsp_qid_map)) {
                         ret = qla25xx_delete_rsp_que(vha, rsp);
                         if (ret != QLA_SUCCESS) {
                                 ql_log(ql_log_warn, vha, 0x00eb,
diff --git a/drivers/scsi/qla2xxx/qla_os.c b/drivers/scsi/qla2xxx/qla_os.c
index f1788db43195..f6c7ce35b542 100644
--- a/drivers/scsi/qla2xxx/qla_os.c
+++ b/drivers/scsi/qla2xxx/qla_os.c
@@ -409,6 +409,9 @@ static void qla2x00_free_queues(struct qla_hw_data *ha)
         int cnt;
 
         for (cnt = 0; cnt < ha->max_req_queues; cnt++) {
+                if (!test_bit(cnt, ha->req_qid_map))
+                        continue;
+
                 req = ha->req_q_map[cnt];
                 qla2x00_free_req_que(ha, req);
         }
@@ -416,6 +419,9 @@ static void qla2x00_free_queues(struct qla_hw_data *ha)
         ha->req_q_map = NULL;
 
         for (cnt = 0; cnt < ha->max_rsp_queues; cnt++) {
+                if (!test_bit(cnt, ha->rsp_qid_map))
+                        continue;
+
                 rsp = ha->rsp_q_map[cnt];
                 qla2x00_free_rsp_que(ha, rsp);
         }
diff --git a/drivers/scsi/qla2xxx/qla_tmpl.c b/drivers/scsi/qla2xxx/qla_tmpl.c
index ddbe2e7ac14d..c3e622524604 100644
--- a/drivers/scsi/qla2xxx/qla_tmpl.c
+++ b/drivers/scsi/qla2xxx/qla_tmpl.c
@@ -395,6 +395,10 @@ qla27xx_fwdt_entry_t263(struct scsi_qla_host *vha,
         if (ent->t263.queue_type == T263_QUEUE_TYPE_REQ) {
                 for (i = 0; i < vha->hw->max_req_queues; i++) {
                         struct req_que *req = vha->hw->req_q_map[i];
+
+                        if (!test_bit(i, vha->hw->req_qid_map))
+                                continue;
+
                         if (req || !buf) {
                                 length = req ?
                                     req->length : REQUEST_ENTRY_CNT_24XX;
@@ -408,6 +412,10 @@ qla27xx_fwdt_entry_t263(struct scsi_qla_host *vha,
         } else if (ent->t263.queue_type == T263_QUEUE_TYPE_RSP) {
                 for (i = 0; i < vha->hw->max_rsp_queues; i++) {
                         struct rsp_que *rsp = vha->hw->rsp_q_map[i];
+
+                        if (!test_bit(i, vha->hw->rsp_qid_map))
+                                continue;
+
                         if (rsp || !buf) {
                                 length = rsp ?
                                     rsp->length : RESPONSE_ENTRY_CNT_MQ;
@@ -634,6 +642,10 @@ qla27xx_fwdt_entry_t274(struct scsi_qla_host *vha,
         if (ent->t274.queue_type == T274_QUEUE_TYPE_REQ_SHAD) {
                 for (i = 0; i < vha->hw->max_req_queues; i++) {
                         struct req_que *req = vha->hw->req_q_map[i];
+
+                        if (!test_bit(i, vha->hw->req_qid_map))
+                                continue;
+
                         if (req || !buf) {
                                 qla27xx_insert16(i, buf, len);
                                 qla27xx_insert16(1, buf, len);
@@ -645,6 +657,10 @@ qla27xx_fwdt_entry_t274(struct scsi_qla_host *vha,
         } else if (ent->t274.queue_type == T274_QUEUE_TYPE_RSP_SHAD) {
                 for (i = 0; i < vha->hw->max_rsp_queues; i++) {
                         struct rsp_que *rsp = vha->hw->rsp_q_map[i];
+
+                        if (!test_bit(i, vha->hw->rsp_qid_map))
+                                continue;
+
                         if (rsp || !buf) {
                                 qla27xx_insert16(i, buf, len);
                                 qla27xx_insert16(1, buf, len);