From: Sukadev Bhattiprolu sukadev@linux.ibm.com
[ Upstream commit 72368f8b2b9e4106072a2728bed3367d54641c22 ]
This fixes a crash in replenish_rx_pool() when called from ibmvnic_poll() after a previous call to replenish_rx_pool() encountered an error when allocating a socket buffer.
Thanks to Rick Lindsley and Dany Madden for helping debug the crash.
Fixes: 4f0b6812e9b9 ("ibmvnic: Introduce batched RX buffer descriptor transmission") Signed-off-by: Sukadev Bhattiprolu sukadev@linux.ibm.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/ethernet/ibm/ibmvnic.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/drivers/net/ethernet/ibm/ibmvnic.c b/drivers/net/ethernet/ibm/ibmvnic.c index e8f4bdb1079c..f1a6f454fe97 100644 --- a/drivers/net/ethernet/ibm/ibmvnic.c +++ b/drivers/net/ethernet/ibm/ibmvnic.c @@ -328,7 +328,14 @@ static void replenish_rx_pool(struct ibmvnic_adapter *adapter,
rx_scrq = adapter->rx_scrq[pool->index]; ind_bufp = &rx_scrq->ind_buf; - for (i = 0; i < count; ++i) { + + /* netdev_skb_alloc() could have failed after we saved a few skbs + * in the indir_buf and we would not have sent them to VIOS yet. + * To account for them, start the loop at ind_bufp->index rather + * than 0. If we pushed all the skbs to VIOS, ind_bufp->index will + * be 0. + */ + for (i = ind_bufp->index; i < count; ++i) { skb = netdev_alloc_skb(adapter->netdev, pool->buff_size); if (!skb) { dev_err(dev, "Couldn't replenish rx buff\n");