3.19.8-ckt6 -stable review patch. If anyone has any objections, please let me know.
------------------
From: Simon Guinot <simon.guinot@xxxxxxxxxxxx>
commit a84e32894191cfcbffa54180d78d7d4654d56c20 upstream.
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@xxxxxxxxxxxx>
Fixes: c5aff18204da ("net: mvneta: driver for Marvell Armada 370/XP network unit")
Tested-by: Yoann Sculo <yoann@xxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Kamal Mostafa <kamal@xxxxxxxxxxxxx>
---
drivers/net/ethernet/marvell/mvneta.c | 22 ++++++++++------------
1 file changed, 10 insertions(+), 12 deletions(-)
diff --git a/drivers/net/ethernet/marvell/mvneta.c b/drivers/net/ethernet/marvell/mvneta.c
index 2562249..fab4757 100644
--- a/drivers/net/ethernet/marvell/mvneta.c
+++ b/drivers/net/ethernet/marvell/mvneta.c
@@ -1435,7 +1435,7 @@ static int mvneta_rx(struct mvneta_port *pp, int rx_todo,
struct mvneta_rx_queue *rxq)
{
struct net_device *dev = pp->dev;
- int rx_done, rx_filled;
+ int rx_done;
u32 rcvd_pkts = 0;
u32 rcvd_bytes = 0;
@@ -1446,7 +1446,6 @@ static int mvneta_rx(struct mvneta_port *pp, int rx_todo,
rx_todo = rx_done;
rx_done = 0;
- rx_filled = 0;
/* Fairness NAPI loop */
while (rx_done < rx_todo) {
@@ -1457,7 +1456,6 @@ static int mvneta_rx(struct mvneta_port *pp, int rx_todo,
int rx_bytes, err;
rx_done++;
- rx_filled++;
rx_status = rx_desc->status;
rx_bytes = rx_desc->data_size - (ETH_FCS_LEN + MVNETA_MH_SIZE);
data = (unsigned char *)rx_desc->buf_cookie;
@@ -1497,6 +1495,14 @@ static int mvneta_rx(struct mvneta_port *pp, int rx_todo,
continue;
}
+ /* Refill processing */
+ err = mvneta_rx_refill(pp, rx_desc);
+ if (err) {
+ netdev_err(dev, "Linux processing - Can't refill\n");
+ rxq->missed++;
+ goto err_drop_frame;
+ }
+
skb = build_skb(data, pp->frag_size > PAGE_SIZE ? 0 : pp->frag_size);
if (!skb)
goto err_drop_frame;
@@ -1516,14 +1522,6 @@ static int mvneta_rx(struct mvneta_port *pp, int rx_todo,
mvneta_rx_csum(pp, rx_status, skb);
napi_gro_receive(&pp->napi, skb);
-
- /* Refill processing */
- err = mvneta_rx_refill(pp, rx_desc);
- if (err) {
- netdev_err(dev, "Linux processing - Can't refill\n");
- rxq->missed++;
- rx_filled--;
- }
}
if (rcvd_pkts) {
@@ -1536,7 +1534,7 @@ static int mvneta_rx(struct mvneta_port *pp, int rx_todo,
}
/* Update rxq management counters */
- mvneta_rxq_desc_num_update(pp, rxq, rx_done, rx_filled);
+ mvneta_rxq_desc_num_update(pp, rxq, rx_done, rx_done);
return rx_done;
}
--
1.9.1
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