Change in ...flashrom[master]: Fix verification with sparse layouts

[Nico Huber (Code Review)]

Nico Huber has uploaded this change for review. ( https://review.coreboot.org/c/flashrom/+/30370

Change subject: Fix verification with sparse layouts
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Fix verification with sparse layouts

The full verification step was not accounting for sparse layouts.
Instead of the old contents, combine_image_by_layout() implicitly
assumed the new contents for unspecified regions.

Change-Id: I44e0cea621f2a3d4dc70fa7e93c52ed95e54014a
Signed-off-by: Nico Huber 
---
M flashrom.c
1 file changed, 11 insertions(+), 4 deletions(-)

git pull ssh://review.coreboot.org:29418/flashrom refs/changes/70/30370/1

diff --git a/flashrom.c b/flashrom.c
index 59a7531..4e10629 100644
--- a/flashrom.c
+++ b/flashrom.c
@@ -2355,17 +2355,24 @@
    			    uint8_t *const newcontents, const uint8_t *const oldcontents)
 {
    const struct flashrom_layout *const layout = get_layout(flashctx);
+	chipoff_t next = 0;

size_t i;
    for (i = 0; i < layout->num_entries; ++i) {
-		if (layout->entries[i].included)
+		if (!layout->entries[i].included)
    		continue;

-		const chipoff_t region_start	= layout->entries[i].start;
-		const chipsize_t region_len	= layout->entries[i].end - layout->entries[i].start + 1;
+		/* copy everything up to the start of this included region */
+		const chipsize_t copy_len = layout->entries[i].start - next;
+		memcpy(newcontents + next, oldcontents + next, copy_len);

-		memcpy(newcontents + region_start, oldcontents + region_start, region_len);
+		/* skip this included region */
+		next = layout->entries[i].end + 1;
    }
+
+	/* copy the rest of the chip */
+	const chipsize_t copy_len = flashctx->chip->total_size * 1024 - next;
+	memcpy(newcontents + next, oldcontents + next, copy_len);
 }

/**