From ede88671664128b811e7c709bead39f5b3f3abcf Mon Sep 17 00:00:00 2001 From: Stefan Raspl Date: Mon, 24 Jun 2013 13:21:51 +0200 Subject: [PATCH] qeth: Fix crash on initial MTU size change When the initial MTU size is changed prior to any activity on the device (e.g. by attaching a z/VM vNIC already configured in Linux to a guestLAN), we call dev_kfree_skb_irq(NULL) which results in a kernel panic. Adding a proper check for NULL pointers to address this issue. Signed-off-by: Stefan Raspl Signed-off-by: Frank Blaschka Reviewed-by: Ursula Braun Signed-off-by: David S. Miller --- drivers/s390/net/qeth_core_main.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/s390/net/qeth_core_main.c b/drivers/s390/net/qeth_core_main.c index d7d036bf8715..e4ca70475190 100644 --- a/drivers/s390/net/qeth_core_main.c +++ b/drivers/s390/net/qeth_core_main.c @@ -1282,8 +1282,10 @@ static void qeth_free_qdio_buffers(struct qeth_card *card) qeth_free_cq(card); cancel_delayed_work_sync(&card->buffer_reclaim_work); - for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; ++j) - dev_kfree_skb_any(card->qdio.in_q->bufs[j].rx_skb); + for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; ++j) { + if (card->qdio.in_q->bufs[j].rx_skb) + dev_kfree_skb_any(card->qdio.in_q->bufs[j].rx_skb); + } kfree(card->qdio.in_q); card->qdio.in_q = NULL; /* inbound buffer pool */