[PATCH AUTOSEL 5.13 13/26] qed: qed ll2 race condition fixes

Sasha Levin
2021-08-24T00:54:55Z

From: Shai Malin <smalin@marvell.com>

[ Upstream commit 37110237f31105d679fc0aa7b11cdec867750ea7 ]

Avoiding qed ll2 race condition and NULL pointer dereference as part
of the remove and recovery flows.

Changes form V1:
- Change (!p_rx->set_prod_addr).
- qed_ll2.c checkpatch fixes.

Change from V2:
- Revert "qed_ll2.c checkpatch fixes".

Signed-off-by: Ariel Elior <aelior@marvell.com>
Signed-off-by: Shai Malin <smalin@marvell.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/net/ethernet/qlogic/qed/qed_ll2.c | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)

diff --git a/drivers/net/ethernet/qlogic/qed/qed_ll2.c b/drivers/net/ethernet/qlogic/qed/qed_ll2.c
index 49783f365079..f2c8273dce67 100644
--- a/drivers/net/ethernet/qlogic/qed/qed_ll2.c
+++ b/drivers/net/ethernet/qlogic/qed/qed_ll2.c
@@ -327,6 +327,9 @@ static int qed_ll2_txq_completion(struct qed_hwfn *p_hwfn, void *p_cookie)
unsigned long flags;
int rc = -EINVAL;

+ if (!p_ll2_conn)
+ return rc;
+
spin_lock_irqsave(&p_tx->lock, flags);
if (p_tx->b_completing_packet) {
rc = -EBUSY;
@@ -500,7 +503,16 @@ static int qed_ll2_rxq_completion(struct qed_hwfn *p_hwfn, void *cookie)
unsigned long flags = 0;
int rc = 0;

+ if (!p_ll2_conn)
+ return rc;
+
spin_lock_irqsave(&p_rx->lock, flags);
+
+ if (!QED_LL2_RX_REGISTERED(p_ll2_conn)) {
+ spin_unlock_irqrestore(&p_rx->lock, flags);
+ return 0;
+ }
+
cq_new_idx = le16_to_cpu(*p_rx->p_fw_cons);
cq_old_idx = qed_chain_get_cons_idx(&p_rx->rcq_chain);

@@ -821,6 +833,9 @@ static int qed_ll2_lb_rxq_completion(struct qed_hwfn *p_hwfn, void *p_cookie)
struct qed_ll2_info *p_ll2_conn = (struct qed_ll2_info *)p_cookie;
int rc;

+ if (!p_ll2_conn)
+ return 0;
+
if (!QED_LL2_RX_REGISTERED(p_ll2_conn))
return 0;

@@ -844,6 +859,9 @@ static int qed_ll2_lb_txq_completion(struct qed_hwfn *p_hwfn, void *p_cookie)
u16 new_idx = 0, num_bds = 0;
int rc;

+ if (!p_ll2_conn)
+ return 0;
+
if (!QED_LL2_TX_REGISTERED(p_ll2_conn))
return 0;

@@ -1725,6 +1743,8 @@ int qed_ll2_post_rx_buffer(void *cxt,
if (!p_ll2_conn)
return -EINVAL;
p_rx = &p_ll2_conn->rx_queue;
+ if (!p_rx->set_prod_addr)
+ return -EIO;

spin_lock_irqsave(&p_rx->lock, flags);
if (!list_empty(&p_rx->free_descq))
--
2.30.2