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

[Anastasia Klimchuk (Code Review)]

Anastasia Klimchuk has submitted this change. ( https://review.coreboot.org/c/flashrom/+/85292?usp=email )

Change subject: libflashrom: Fix comparison of layout romentry regions
......................................................................

libflashrom: Fix comparison of layout romentry regions

Comparing structs (romentries in this case) with memcmp
won't work if the struct includes pointers.

Also in this case romentry region is compared to the one loaded
from dump, and from dump only start, end and name are filled in.

https://ticket.coreboot.org/issues/570

Prior effort: https://review.coreboot.org/c/flashrom/+/72433

Change-Id: I715969036c8e516aac8d90b46830f1f92ae6a160
Signed-off-by: Anastasia Klimchuk 
Reviewed-on: https://review.coreboot.org/c/flashrom/+/85292
Reviewed-by: Peter Marheine 
Tested-by: build bot (Jenkins) 
---
M libflashrom.c
1 file changed, 10 insertions(+), 1 deletion(-)

Approvals:
  build bot (Jenkins): Verified
  Peter Marheine: Looks good to me, approved

diff --git a/libflashrom.c b/libflashrom.c
index dfc86e6..78e5c9b 100644
--- a/libflashrom.c
+++ b/libflashrom.c
@@ -306,6 +306,15 @@
    }
 }

+static int compare_region_with_dump(const struct romentry *const a, const struct romentry *const b)
+{
+	if (a->region.start != b->region.end
+		|| a->region.end != b->region.end
+		|| strcmp(a->region.name, b->region.name))
+			return 1;
+	return 0;
+}
+
 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 +352,7 @@

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 && !compare_region_with_dump(chip_entry, dump_entry)) {
    		chip_entry = layout_next(chip_layout, chip_entry);
    		dump_entry = layout_next(dump_layout, dump_entry);
    	}