[PATCH net v1 2/3] octeon_ep: add checks to fix NULL pointer dereferences

From: Shinas Rasheed
Date: Fri Nov 01 2024 - 06:35:27 EST


Add Checks to avoid NULL pointer references that might
happen in rare and corner cases

Fixes: 6a610a46bad1 ("octeon_ep: add support for ndo ops")
Fixes: 1f2c2d0cee02 ("octeon_ep: add hardware configuration APIs")
Fixes: 0807dc76f3bf ("octeon_ep: support Octeon CN10K devices")
Signed-off-by: Shinas Rasheed <srasheed@xxxxxxxxxxx>
---
drivers/net/ethernet/marvell/octeon_ep/octep_cn9k_pf.c | 9 ++++++++-
drivers/net/ethernet/marvell/octeon_ep/octep_cnxk_pf.c | 9 ++++++++-
drivers/net/ethernet/marvell/octeon_ep/octep_main.c | 3 +++
3 files changed, 19 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/marvell/octeon_ep/octep_cn9k_pf.c b/drivers/net/ethernet/marvell/octeon_ep/octep_cn9k_pf.c
index b5805969404f..b87336b2e4b9 100644
--- a/drivers/net/ethernet/marvell/octeon_ep/octep_cn9k_pf.c
+++ b/drivers/net/ethernet/marvell/octeon_ep/octep_cn9k_pf.c
@@ -617,7 +617,14 @@ static irqreturn_t octep_rsvd_intr_handler_cn93_pf(void *dev)
static irqreturn_t octep_ioq_intr_handler_cn93_pf(void *data)
{
struct octep_ioq_vector *vector = (struct octep_ioq_vector *)data;
- struct octep_oq *oq = vector->oq;
+ struct octep_oq *oq;
+
+ if (!vector)
+ return IRQ_HANDLED;
+ oq = vector->oq;
+
+ if (!oq || !(oq->napi))
+ return IRQ_HANDLED;

napi_schedule_irqoff(oq->napi);
return IRQ_HANDLED;
diff --git a/drivers/net/ethernet/marvell/octeon_ep/octep_cnxk_pf.c b/drivers/net/ethernet/marvell/octeon_ep/octep_cnxk_pf.c
index 5de0b5ecbc5f..65a8dc1d492b 100644
--- a/drivers/net/ethernet/marvell/octeon_ep/octep_cnxk_pf.c
+++ b/drivers/net/ethernet/marvell/octeon_ep/octep_cnxk_pf.c
@@ -638,7 +638,14 @@ static irqreturn_t octep_rsvd_intr_handler_cnxk_pf(void *dev)
static irqreturn_t octep_ioq_intr_handler_cnxk_pf(void *data)
{
struct octep_ioq_vector *vector = (struct octep_ioq_vector *)data;
- struct octep_oq *oq = vector->oq;
+ struct octep_oq *oq;
+
+ if (!vector)
+ return IRQ_HANDLED;
+ oq = vector->oq;
+
+ if (!oq || !(oq->napi))
+ return IRQ_HANDLED;

napi_schedule_irqoff(oq->napi);
return IRQ_HANDLED;
diff --git a/drivers/net/ethernet/marvell/octeon_ep/octep_main.c b/drivers/net/ethernet/marvell/octeon_ep/octep_main.c
index ff72b796bd25..dc783c568e2c 100644
--- a/drivers/net/ethernet/marvell/octeon_ep/octep_main.c
+++ b/drivers/net/ethernet/marvell/octeon_ep/octep_main.c
@@ -1016,6 +1016,9 @@ static void octep_get_stats64(struct net_device *netdev,
struct octep_iq *iq = oct->iq[q];
struct octep_oq *oq = oct->oq[q];

+ if (!iq || !oq)
+ return;
+
tx_packets += iq->stats.instr_completed;
tx_bytes += iq->stats.bytes_sent;
rx_packets += oq->stats.packets;
--
2.25.1