[Skiboot] [PATCH 3/7] hdata: Make hdata child accessors check the header

[Nicholas Piggin]

Like other (idata) accessors already do, check the common header in
hdata child accessor calls.

Signed-off-by: Nicholas Piggin <npiggin at gmail.com>
---
 hdata/hdif.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/hdata/hdif.c b/hdata/hdif.c
index 13c128c97..aba7f3660 100644
--- a/hdata/hdif.c
+++ b/hdata/hdif.c
@@ -157,6 +157,12 @@ HDIF_child_arr(const struct HDIF_common_hdr *hdif, unsigned int idx)
 {
 	struct HDIF_child_ptr *children;
 
+	if (!HDIF_check(hdif, NULL)) {
+		prerror("HDIF: Bad header format !\n");
+		backtrace();
+		return NULL;
+	}
+
 	children = (void *)hdif + be32_to_cpu(hdif->child_off);
 
 	if (idx >= be16_to_cpu(hdif->child_count)) {
@@ -177,6 +183,12 @@ struct HDIF_common_hdr *HDIF_child(const struct HDIF_common_hdr *hdif,
 	struct HDIF_common_hdr *ret;
 	long child_off;
 
+	if (!HDIF_check(hdif, NULL)) {
+		prerror("HDIF: Bad header format !\n");
+		backtrace();
+		return NULL;
+	}
+
 	/* child must be in hdif's child array */
 	child_off = (void *)child - (base + be32_to_cpu(hdif->child_off));
 	assert(child_off % sizeof(struct HDIF_child_ptr) == 0);
-- 
2.40.1