[PATCH] mt76: usb: check urb->num_sgs limit in mt76u_process_rx_entry
From: lorenzo@kernel.org
Date: 2019-02-20 09:20:58
Subsystem:
mediatek mt76 wireless lan driver, the rest · Maintainers:
Felix Fietkau, Lorenzo Bianconi, Ryder Lee, Linus Torvalds
From: Lorenzo Bianconi <lorenzo@kernel.org> check nsgs value is less than urb->num_sgs in mt76u_process_rx_entry in order to avoid an out-of-bound access of urb->sg array Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org> --- drivers/net/wireless/mediatek/mt76/usb.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/net/wireless/mediatek/mt76/usb.c b/drivers/net/wireless/mediatek/mt76/usb.c
index 78191968b4fa..5d7b57827d1e 100644
--- a/drivers/net/wireless/mediatek/mt76/usb.c
+++ b/drivers/net/wireless/mediatek/mt76/usb.c@@ -464,7 +464,7 @@ mt76u_process_rx_entry(struct mt76_dev *dev, struct mt76u_buf *buf) __skb_put(skb, data_len); len -= data_len; - while (len > 0 && urb->num_sgs) { + while (len > 0 && nsgs < urb->num_sgs) { data_len = min_t(int, len, urb->sg[nsgs].length); skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, sg_page(&urb->sg[nsgs]),
--
2.20.1