[U-Boot] [PATCH 1/3] fdtdec: protect against another NULL phandlep in fdtdec_add_reserved_memory()

Heiko Stuebner heiko at sntech.de
Tue Oct 8 00:22:05 UTC 2019

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
sucessfully if a matching region is found, even though no-one wants to
work with the phandle.

Fixes: c9222a08b3f7 ("fdtdec: Implement fdtdec_add_reserved_memory()")
Signed-off-by: Heiko Stuebner <heiko at sntech.de>
 lib/fdtdec.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/fdtdec.c b/lib/fdtdec.c
index 74525c84e7..17455c5506 100644
--- a/lib/fdtdec.c
+++ b/lib/fdtdec.c
@@ -1363,7 +1363,8 @@ 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;

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