On Thu, 30 Jul 2009, Johannes Berg wrote:

On Thu, 2009-07-30 at 16:11 +0200, Julia Lawall wrote:

quoted

From: Julia Lawall <redacted>

Check that the result of kzalloc is not NULL before a dereference.

quoted

 		irq_client = kzalloc(sizeof(struct pmf_irq_client),
 				     GFP_KERNEL);
+		if (!irq_client) {
+			err = -ENOMEM;
+			printk(KERN_ERR "snd-aoa: gpio layer failed to"
+				" register %s irq (%d)\n", name, err);
+			goto out_unlock;
+		}

Looks good, thanks, but I'd really drop the printk if only to not have
the string there, that doesn't really seem interesting.

The printk is based on similar error handling code a few lines later:

               if (err) {
                        printk(KERN_ERR "snd-aoa: gpio layer failed to"
                                        " register %s irq (%d)\n", name, 
err);
                        kfree(irq_client);
                        goto out_unlock;
                }

Should the printk be removed in this case as well?  Or is it ok to fail 
silently in one case and not in the other?

julia