[PATCH net 2/2] net: airoha: Add size check for TX NAPIs in airoha_qdma_cleanup()

[Lorenzo Bianconi <lorenzo@kernel.org>]

If airoha_qdma_init routine fails before airoha_qdma_tx_irq_init() runs
successfully for all TX NAPIs, airoha_qdma_cleanup() will
unconditionally runs netif_napi_del() on TX NAPIs, triggering a NULL
pointer dereference. Fix the issue relying on q_tx_irq size value to
check if the TX NAPIs is properly initialized in airoha_qdma_cleanup().

Fixes: 23020f049327 ("net: airoha: Introduce ethernet support for EN7581 SoC")
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
---
 drivers/net/ethernet/airoha/airoha_eth.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/airoha/airoha_eth.c b/drivers/net/ethernet/airoha/airoha_eth.c
index a6f8b231583d..1ca4087e675d 100644
--- a/drivers/net/ethernet/airoha/airoha_eth.c
+++ b/drivers/net/ethernet/airoha/airoha_eth.c
@@ -1398,8 +1398,12 @@ static void airoha_qdma_cleanup(struct airoha_qdma *qdma)
 		}
 	}
 
-	for (i = 0; i < ARRAY_SIZE(qdma->q_tx_irq); i++)
+	for (i = 0; i < ARRAY_SIZE(qdma->q_tx_irq); i++) {
+		if (!qdma->q_tx_irq[i].size)
+			continue;
+
 		netif_napi_del(&qdma->q_tx_irq[i].napi);
+	}
 
 	for (i = 0; i < ARRAY_SIZE(qdma->q_tx); i++) {
 		if (!qdma->q_tx[i].ndesc)

-- 
2.53.0