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net: hns: dereference ppe_cb->ppe_common_cb if it is non-null

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ppe_cb->ppe_common_cb is being dereferenced before a null check is
being made on it.  If ppe_cb->ppe_common_cb is null then we end up
with a null pointer dereference when assigning dsaf_dev.  Fix this
by moving the initialisation of dsaf_dev once we know
ppe_cb->ppe_common_cb is OK to dereference.

Signed-off-by: Colin Ian King <colin.king@canonical.com>
Acked-by: Yisen Zhuang <yisen.zhuang@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Colin Ian King 2016-08-25 07:51:10 +01:00 committed by David S. Miller
parent b628d611a2
commit c234af5875
1 changed files with 2 additions and 1 deletions
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3
drivers/net/ethernet/hisilicon/hns/hns_dsaf_ppe.c
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@ -328,9 +328,10 @@ static void hns_ppe_init_hw(struct hns_ppe_cb *ppe_cb)
static void hns_ppe_uninit_hw(struct hns_ppe_cb *ppe_cb)
{
u32 port;
struct dsaf_device *dsaf_dev = ppe_cb->ppe_common_cb->dsaf_dev;
if (ppe_cb->ppe_common_cb) {
struct dsaf_device *dsaf_dev = ppe_cb->ppe_common_cb->dsaf_dev;
port = ppe_cb->index;
dsaf_dev->misc_op->ppe_srst(dsaf_dev, port, 0);
}