[RFC PATCH 07/15] libfdt: fdt_check_full: Handle FDT_NOP when FDT_END is expected

Herve Codina
2026-02-10T17:34:32Z

fdt_check_full() makes the assumption that a FDT_END tag is present
immediately after the FDT_END_NODE tag related to the root node.

This assumption is not correct. Indeed, FDT_NOP tags can be present
between this FDT_END_NODE tag and the FDT_END tag.

Handle those possible FDT_NOP tags.

Signed-off-by: Herve Codina <herve.codina@bootlin.com>
---
libfdt/fdt_check.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libfdt/fdt_check.c b/libfdt/fdt_check.c
index a21ebbc..cca0523 100644
--- a/libfdt/fdt_check.c
+++ b/libfdt/fdt_check.c
@@ -43,7 +43,7 @@ int fdt_check_full(const void *fdt, size_t bufsize)
return nextoffset;

/* If we see two root nodes, something is wrong */
- if (expect_end && tag != FDT_END)
+ if (expect_end && tag != FDT_END && tag != FDT_NOP)
return -FDT_ERR_BADSTRUCTURE;

switch (tag) {
--
2.52.0