staging: netlogic: Return zero pointer after failed kmalloc

Return a ZERO_SIZE_PTR in the xlr_config_spill function if the
kmalloc returns an invalid value. This change prevents a possible
segmentation fault as the invalid pointer is fed into PTR_ALIGN macro.

Signed-off-by: Laura Garcia Liebana <nevola@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/netlogic/xlr_net.c b/drivers/staging/netlogic/xlr_net.c
index 98e74d7..0015847 100644 (file)
--- a/drivers/staging/netlogic/xlr_net.c
+++ b/drivers/staging/netlogic/xlr_net.c
@@ -437,8 +437,10 @@ static void *xlr_config_spill(struct xlr_net_priv *priv, int reg_start_0,
        base = priv->base_addr;
        spill_size = size;
        spill = kmalloc(spill_size + SMP_CACHE_BYTES, GFP_ATOMIC);
-       if (!spill)
+       if (!spill) {
                pr_err("Unable to allocate memory for spill area!\n");
+               return ZERO_SIZE_PTR;
+       }
 
        spill = PTR_ALIGN(spill, SMP_CACHE_BYTES);
        phys_addr = virt_to_phys(spill);