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mt76: usb: do not build the skb if reported len does not fit in buf_size 

Precompute data length in order to avoid to allocate the related
skb data structure if reported length does not fit in queue buf_size

Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi@redhat.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>
This commit is contained in:
Lorenzo Bianconi 2018-12-01 15:01:19 +01:00 committed by Felix Fietkau
parent 4d4b12bc56
commit 0ecf94dc36
1 changed files with 4 additions and 6 deletions
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10
drivers/net/wireless/mediatek/mt76/usb.c
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@ -407,17 +407,15 @@ mt76u_process_rx_entry(struct mt76_dev *dev, struct urb *urb)
if (len < 0)
return 0;
data_len = min_t(int, len, urb->sg[0].length - MT_DMA_HDR_LEN);
if (MT_DMA_HDR_LEN + data_len > SKB_WITH_OVERHEAD(q->buf_size))
return 0;
skb = build_skb(data, q->buf_size);
if (!skb)
return 0;
data_len = min_t(int, len, urb->sg[0].length - MT_DMA_HDR_LEN);
skb_reserve(skb, MT_DMA_HDR_LEN);
if (skb->tail + data_len > skb->end) {
dev_kfree_skb(skb);
return 1;
}
__skb_put(skb, data_len);
len -= data_len;