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    Subject[PATCH AUTOSEL 4.4 12/13] scsi: libcxgbi: add a check for NULL pointer in cxgbi_check_route()
    Date
    From: Varun Prakash <varun@chelsio.com>

    [ Upstream commit cc555759117e8349088e0c5d19f2f2a500bafdbd ]

    ip_dev_find() can return NULL so add a check for NULL pointer.

    Signed-off-by: Varun Prakash <varun@chelsio.com>
    Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    drivers/scsi/cxgbi/libcxgbi.c | 4 ++++
    1 file changed, 4 insertions(+)

    diff --git a/drivers/scsi/cxgbi/libcxgbi.c b/drivers/scsi/cxgbi/libcxgbi.c
    index f3bb7af4e984..5eaf14c15590 100644
    --- a/drivers/scsi/cxgbi/libcxgbi.c
    +++ b/drivers/scsi/cxgbi/libcxgbi.c
    @@ -634,6 +634,10 @@ static struct cxgbi_sock *cxgbi_check_route(struct sockaddr *dst_addr)

    if (ndev->flags & IFF_LOOPBACK) {
    ndev = ip_dev_find(&init_net, daddr->sin_addr.s_addr);
    + if (!ndev) {
    + err = -ENETUNREACH;
    + goto rel_neigh;
    + }
    mtu = ndev->mtu;
    pr_info("rt dev %s, loopback -> %s, mtu %u.\n",
    n->dev->name, ndev->name, mtu);
    --
    2.20.1
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