diff mbox series

[5/5] wilc1000: add valid vmm_entry check before fetching from TX queue

Message ID 20220504161924.2146601-5-ajay.kathat@microchip.com (mailing list archive)
State Accepted
Commit 62296b3e19dd252694d24a60d6f10b487551d70b
Delegated to: Kalle Valo
Headers show
Series [1/5] wilc1000: increase firmware version array size | expand

Commit Message

Ajay Singh May 4, 2022, 4:19 p.m. UTC 
From: Ajay Singh <ajay.kathat@microchip.com>

'vmm_table' array contains the size of data buffer length including host
header length. In 'vmm_table' array, the Zero value means the end of
vmm_entries that needs to transfer to firmware which is calculated based on
VMM free size in firmware.

Use 'vmm_table' valid entry check before fetching the entry from TX queue to
only copy valid number of entries to avoid possible NULL pointer exception
observed sometimes during large file transfers.

Signed-off-by: Ajay Singh <ajay.kathat@microchip.com>
---
 drivers/net/wireless/microchip/wilc1000/wlan.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)
diff mbox series

Patch

diff --git a/drivers/net/wireless/microchip/wilc1000/wlan.c b/drivers/net/wireless/microchip/wilc1000/wlan.c
index fb5633a05fd5..48441f0389ca 100644
--- a/drivers/net/wireless/microchip/wilc1000/wlan.c
+++ b/drivers/net/wireless/microchip/wilc1000/wlan.c
@@ -875,14 +875,15 @@  int wilc_wlan_handle_txq(struct wilc *wilc, u32 *txq_count)
 		char *bssid;
 		u8 mgmt_ptk = 0;
 
+		if (vmm_table[i] == 0 || vmm_entries_ac[i] >= NQUEUES)
+			break;
+
 		tqe = wilc_wlan_txq_remove_from_head(wilc, vmm_entries_ac[i]);
-		ac_pkt_num_to_chip[vmm_entries_ac[i]]++;
 		if (!tqe)
 			break;
 
+		ac_pkt_num_to_chip[vmm_entries_ac[i]]++;
 		vif = tqe->vif;
-		if (vmm_table[i] == 0)
-			break;
 
 		le32_to_cpus(&vmm_table[i]);
 		vmm_sz = FIELD_GET(WILC_VMM_BUFFER_SIZE, vmm_table[i]);