fdtdec: protect against another NULL phandlep in fdtdec_add_reserved_memory()

The change adding fdtdec_add_reserved_memory() already protected the added
phandle against the phandlep being NULL - making the phandlep var optional.

But in the early code checking for an already existing carveout this check
was not done and thus the phandle assignment could run into trouble,
so add a check there as well, which makes the function still return
successfully if a matching region is found, even though no-one wants to
work with the phandle.

Fixes: c9222a08 ("fdtdec: Implement fdtdec_add_reserved_memory()")
Signed-off-by: NHeiko Stuebner <heiko.stuebner@theobroma-systems.com>
Reviewed-by: NSimon Glass <sjg@chromium.org>

include/fdtdec.h

@@ -1061,6 +1061,7 @@ static inline int fdtdec_set_phandle(void *blob, int node, uint32_t phandle)
  * @param basename	base name of the node to create
  * @param carveout	information about the carveout region
  * @param phandlep	return location for the phandle of the carveout region
+ *			can be NULL
  * @return 0 on success or a negative error code on failure
  */
 int fdtdec_add_reserved_memory(void *blob, const char *basename,

lib/fdtdec.c

@@ -1309,7 +1309,8 @@ int fdtdec_add_reserved_memory(void *blob, const char *basename,
 		}
 
 		if (addr == carveout->start && (addr + size) == carveout->end) {
-			*phandlep = fdt_get_phandle(blob, node);
+			if (phandlep)
+				*phandlep = fdt_get_phandle(blob, node);
 			return 0;
 		}
 	}