cnic: Fix occasional NULL pointer dereference during reboot.
We register with bnx2x before we allocate ctx_tbl structure, so it is
possible for bnx2x to call cnic_ctl before the structure is allocated.
This can sometimes cause NULL pointer dereference of cp->ctx_tbl. We
fix this by adding simple checking for valid state before proceeding.
The cnic_ctl call is RCU protected so we don't have to deal with race
conditions.
Because of the additional checking, we need to finish the shutdown
before clearing the CNIC_UP flag.
Signed-off-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/ethernet/broadcom/cnic.c b/drivers/net/ethernet/broadcom/cnic.c
index 0e9be2b..31b05ad 100644
--- a/drivers/net/ethernet/broadcom/cnic.c
+++ b/drivers/net/ethernet/broadcom/cnic.c
@@ -291,6 +291,9 @@
{
u32 i;
+ if (!cp->ctx_tbl)
+ return -EINVAL;
+
for (i = 0; i < cp->max_cid_space; i++) {
if (cp->ctx_tbl[i].cid == cid) {
*l5_cid = i;
@@ -3220,6 +3223,9 @@
u32 l5_cid;
struct cnic_local *cp = dev->cnic_priv;
+ if (!test_bit(CNIC_F_CNIC_UP, &dev->flags))
+ break;
+
if (cnic_get_l5_cid(cp, cid, &l5_cid) == 0) {
struct cnic_context *ctx = &cp->ctx_tbl[l5_cid];
@@ -4253,8 +4259,6 @@
struct cnic_local *cp = dev->cnic_priv;
int i;
- cp->stop_cm(dev);
-
if (!cp->csk_tbl)
return 0;
@@ -5290,6 +5294,7 @@
i++;
}
cnic_shutdown_rings(dev);
+ cp->stop_cm(dev);
clear_bit(CNIC_F_CNIC_UP, &dev->flags);
RCU_INIT_POINTER(cp->ulp_ops[CNIC_ULP_L4], NULL);
synchronize_rcu();