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scsi: qedf: Fix crash when MFW calls for protocol stats while function is still probing

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The MFW may make a call to qed and then to qedf for protocol statistics
while the function is still probing.  If this happens it's possible that
some members of the struct qedf_ctx may not be fully initialized which can
result in a NULL pointer dereference or general protection fault.

To prevent this, add a new flag call QEDF_PROBING and set it when the
__qedf_probe() function is active. Then in the qedf_get_protocol_tlv_data()
function we can check if the function is still probing and return
immediantely before any uninitialized structures can be touched.

Link: https://lore.kernel.org/r/20200416084314.18851-9-skashyap@marvell.com
Signed-off-by: Chad Dupuis <cdupuis@marvell.com>
Signed-off-by: Saurav Kashyap <skashyap@marvell.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Chad Dupuis 2020-04-16 01:43:13 -07:00 committed by Martin K. Petersen
parent f6b172f219
commit ad40f52560
2 changed files with 32 additions and 4 deletions
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1
drivers/scsi/qedf/qedf.h
View File

@ -355,6 +355,7 @@ struct qedf_ctx {
#define QEDF_GRCDUMP_CAPTURE 4
#define QEDF_IN_RECOVERY 5
#define QEDF_DBG_STOP_IO 6
#define QEDF_PROBING 8
unsigned long flags; /* Miscellaneous state flags */
int fipvlan_retries;
u8 num_queues;

35
drivers/scsi/qedf/qedf_main.c
View File

@ -3190,7 +3190,7 @@ static int __qedf_probe(struct pci_dev *pdev, int mode)
{
int rc = -EINVAL;
struct fc_lport *lport;
struct qedf_ctx *qedf;
struct qedf_ctx *qedf = NULL;
struct Scsi_Host *host;
bool is_vf = false;
struct qed_ll2_params params;
@ -3220,6 +3220,7 @@ static int __qedf_probe(struct pci_dev *pdev, int mode)
/* Initialize qedf_ctx */
qedf = lport_priv(lport);
set_bit(QEDF_PROBING, &qedf->flags);
qedf->lport = lport;
qedf->ctlr.lp = lport;
qedf->pdev = pdev;
@ -3244,9 +3245,12 @@ static int __qedf_probe(struct pci_dev *pdev, int mode)
} else {
/* Init pointers during recovery */
qedf = pci_get_drvdata(pdev);
set_bit(QEDF_PROBING, &qedf->flags);
lport = qedf->lport;
}
QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_DISC, "Probe started.\n");
host = lport->host;
/* Allocate mempool for qedf_io_work structs */
@ -3553,6 +3557,10 @@ static int __qedf_probe(struct pci_dev *pdev, int mode)
else
fc_fabric_login(lport);
QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_DISC, "Probe done.\n");
clear_bit(QEDF_PROBING, &qedf->flags);
/* All good */
return 0;
@ -3578,6 +3586,11 @@ err2:
err1:
scsi_host_put(lport->host);
err0:
if (qedf) {
QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_DISC, "Probe done.\n");
clear_bit(QEDF_PROBING, &qedf->flags);
}
return rc;
}
@ -3727,11 +3740,25 @@ void qedf_get_protocol_tlv_data(void *dev, void *data)
{
struct qedf_ctx *qedf = dev;
struct qed_mfw_tlv_fcoe *fcoe = data;
struct fc_lport *lport = qedf->lport;
struct Scsi_Host *host = lport->host;
struct fc_host_attrs *fc_host = shost_to_fc_host(host);
struct fc_lport *lport;
struct Scsi_Host *host;
struct fc_host_attrs *fc_host;
struct fc_host_statistics *hst;
if (!qedf) {
QEDF_ERR(NULL, "qedf is null.\n");
return;
}
if (test_bit(QEDF_PROBING, &qedf->flags)) {
QEDF_ERR(&qedf->dbg_ctx, "Function is still probing.\n");
return;
}
lport = qedf->lport;
host = lport->host;
fc_host = shost_to_fc_host(host);
/* Force a refresh of the fc_host stats including offload stats */
hst = qedf_fc_get_host_stats(host);