net: mvneta: fix refilling for Rx DMA buffers
With the actual code, if a memory allocation error happens while
refilling a Rx descriptor, then the original Rx buffer is both passed
to the networking stack (in a SKB) and let in the Rx ring. This leads
to various kernel oops and crashes.
As a fix, this patch moves Rx descriptor refilling ahead of building
SKB with the associated Rx buffer. In case of a memory allocation
failure, data is dropped and the original DMA buffer is put back into
the Rx ring.
Signed-off-by: Simon Guinot <simon.guinot@sequanux.org>
Fixes: c5aff18204
("net: mvneta: driver for Marvell Armada 370/XP network unit")
Cc: <stable@vger.kernel.org> # v3.8+
Tested-by: Yoann Sculo <yoann@sculo.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Родитель
a7a6268590
Коммит
a84e328941
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@ -1462,7 +1462,7 @@ static int mvneta_rx(struct mvneta_port *pp, int rx_todo,
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struct mvneta_rx_queue *rxq)
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{
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struct net_device *dev = pp->dev;
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int rx_done, rx_filled;
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int rx_done;
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u32 rcvd_pkts = 0;
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u32 rcvd_bytes = 0;
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@ -1473,7 +1473,6 @@ static int mvneta_rx(struct mvneta_port *pp, int rx_todo,
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rx_todo = rx_done;
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rx_done = 0;
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rx_filled = 0;
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/* Fairness NAPI loop */
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while (rx_done < rx_todo) {
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@ -1484,7 +1483,6 @@ static int mvneta_rx(struct mvneta_port *pp, int rx_todo,
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int rx_bytes, err;
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rx_done++;
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rx_filled++;
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rx_status = rx_desc->status;
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rx_bytes = rx_desc->data_size - (ETH_FCS_LEN + MVNETA_MH_SIZE);
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data = (unsigned char *)rx_desc->buf_cookie;
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@ -1524,6 +1522,14 @@ static int mvneta_rx(struct mvneta_port *pp, int rx_todo,
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continue;
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}
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/* Refill processing */
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err = mvneta_rx_refill(pp, rx_desc);
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if (err) {
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netdev_err(dev, "Linux processing - Can't refill\n");
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rxq->missed++;
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goto err_drop_frame;
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}
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skb = build_skb(data, pp->frag_size > PAGE_SIZE ? 0 : pp->frag_size);
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if (!skb)
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goto err_drop_frame;
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@ -1543,14 +1549,6 @@ static int mvneta_rx(struct mvneta_port *pp, int rx_todo,
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mvneta_rx_csum(pp, rx_status, skb);
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napi_gro_receive(&pp->napi, skb);
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/* Refill processing */
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err = mvneta_rx_refill(pp, rx_desc);
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if (err) {
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netdev_err(dev, "Linux processing - Can't refill\n");
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rxq->missed++;
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rx_filled--;
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}
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}
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if (rcvd_pkts) {
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@ -1563,7 +1561,7 @@ static int mvneta_rx(struct mvneta_port *pp, int rx_todo,
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}
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/* Update rxq management counters */
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mvneta_rxq_desc_num_update(pp, rxq, rx_done, rx_filled);
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mvneta_rxq_desc_num_update(pp, rxq, rx_done, rx_done);
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return rx_done;
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}
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