net: ll_temac: check the return value of devm_kmalloc()

devm_kmalloc() returns a pointer to allocated memory on success, NULL
on failure. While lp->indirect_lock is allocated by devm_kmalloc()
without proper check. It is better to check the value of it to
prevent potential wrong memory access.

Fixes: f14f5c11f051 ("net: ll_temac: Support indirect_mutex share within TEMAC IP")
Signed-off-by: Xiaoke Wang <xkernel.wang@foxmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/xilinx/ll_temac_main.c b/drivers/net/ethernet/xilinx/ll_temac_main.c
index b900ab5aef2a8fa578c1649c0f1fee4fdfb415a7..64c7e26c3b75488f1ffd7dc6a33f308bea0299a6 100644 (file)
--- a/drivers/net/ethernet/xilinx/ll_temac_main.c
+++ b/drivers/net/ethernet/xilinx/ll_temac_main.c
@@ -1433,6 +1433,8 @@ static int temac_probe(struct platform_device *pdev)
                lp->indirect_lock = devm_kmalloc(&pdev->dev,
                                                 sizeof(*lp->indirect_lock),
                                                 GFP_KERNEL);
+               if (!lp->indirect_lock)
+                       return -ENOMEM;
                spin_lock_init(lp->indirect_lock);
        }