[PATCH] wimax: debug: fix a missing-check bug in d_parse_params()

[Gen Zhang <blackgod016574@gmail.com>]

In d_parse_params(), 'params_orig' is allocated by kstrdup(). It returns
NULL when fails. So 'params_orig' should be checked.

Signed-off-by: Gen Zhang <blackgod016574@gmail.com>
---
diff --git a/include/linux/wimax/debug.h b/include/linux/wimax/debug.h
index aaf24ba..bacd6cb 100644
--- a/include/linux/wimax/debug.h
+++ b/include/linux/wimax/debug.h
@@ -496,6 +496,11 @@ void d_parse_params(struct d_level *d_level, size_t d_level_size,
 	if (_params == NULL)
 		return;
 	params_orig = kstrdup(_params, GFP_KERNEL);
+	if (!params_orig) {
+		printk(KERN_ERR "%s: can't duplicate string '%s'\n",
+		       tag, _params);
+		return;
+	}
 	params = params_orig;
 	while (1) {
 		token = strsep(&params, " ");