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bnxt_en: Fix crash in bnxt_free_tx_skbs() during tx timeout.

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The ring index j is not wrapped properly at the end of the ring, causing
it to reference pointers past the end of the ring.  For proper loop
termination and to access the ring properly, we need to increment j and
mask it before referencing the ring entry.

Signed-off-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Michael Chan 2016-01-28 03:11:22 -05:00 committed by David S. Miller
parent 8a4d4c8dde
commit d612a57977
1 changed files with 3 additions and 2 deletions
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5
drivers/net/ethernet/broadcom/bnxt/bnxt.c
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@ -1490,10 +1490,11 @@ static void bnxt_free_tx_skbs(struct bnxt *bp)
last = tx_buf->nr_frags;
j += 2;
for (k = 0; k < last; k++, j = NEXT_TX(j)) {
for (k = 0; k < last; k++, j++) {
int ring_idx = j & bp->tx_ring_mask;
skb_frag_t *frag = &skb_shinfo(skb)->frags[k];
tx_buf = &txr->tx_buf_ring[j];
tx_buf = &txr->tx_buf_ring[ring_idx];
dma_unmap_page(
&pdev->dev,
dma_unmap_addr(tx_buf, mapping),