[S] Change in flashrom[main]: libflashrom: Fix comparison of layout entries

[Anastasia Klimchuk (Code Review)]

Anastasia Klimchuk has uploaded this change for review. ( https://review.coreboot.org/c/flashrom/+/85201?usp=email )

Change subject: libflashrom: Fix comparison of layout entries
......................................................................

libflashrom: Fix comparison of layout entries

A `next` pointer was added to `struct romentry` in commit 953c5ad44058
(layout: Use linked list for `struct romentry`). Hence, comparing the
whole contents to match entries doesn't work anymore. Solve that by
comparing the `start`, `end` and `name` fields individually.

The introduced layout_cmp() function could be made a new API, but
that's not necessary for the release branch.

Change-Id: I125d3892d9efc68e8fc19eef559c82d46c3bdc94
Signed-off-by: Nico Huber 
---
M libflashrom.c
1 file changed, 16 insertions(+), 1 deletion(-)

git pull ssh://review.coreboot.org:29418/flashrom refs/changes/01/85201/1

diff --git a/libflashrom.c b/libflashrom.c
index dfc86e6..3961e24 100644
--- a/libflashrom.c
+++ b/libflashrom.c
@@ -306,6 +306,21 @@
    }
 }

+static int layout_cmp(const struct romentry *const a, const struct romentry *const b)
+{
+	int ret;
+
+	ret = (int)a->start - (int)b->start;
+	if (ret)
+		return ret;
+
+	ret = (int)a->end - (int)b->end;
+	if (ret)
+		return ret;
+
+	return strcmp(a->name, b->name);
+}
+
 int flashrom_layout_read_from_ifd(struct flashrom_layout **const layout, struct flashctx *const flashctx,
    			  const void *const dump, const size_t len)
 {
@@ -343,7 +358,7 @@

const struct romentry *chip_entry = layout_next(chip_layout, NULL);
    	const struct romentry *dump_entry = layout_next(dump_layout, NULL);
-		while (chip_entry && dump_entry && !memcmp(chip_entry, dump_entry, sizeof(*chip_entry))) {
+		while (chip_entry && dump_entry && !layout_cmp(chip_entry, dump_entry)) {
    		chip_entry = layout_next(chip_layout, chip_entry);
    		dump_entry = layout_next(dump_layout, dump_entry);
    	}