From: Michael Chan Date: Thu, 28 Jan 2016 08:11:22 +0000 (-0500) Subject: bnxt_en: Fix crash in bnxt_free_tx_skbs() during tx timeout. X-Git-Tag: v4.5-rc3~21^2~12^2 X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=d612a579771385e08f7b665063b36bfa52c03ea3;p=linux.git bnxt_en: Fix crash in bnxt_free_tx_skbs() during tx timeout. 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 Signed-off-by: David S. Miller --- diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c index ebc541340ea1..5dc89e527e7d 100644 --- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c @@ -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),