[S] Change in flashrom[master]: layout.c: Validate _layout_entry_by_name() arguments before use

[Edward O'Callaghan (Code Review)]

Edward O'Callaghan has submitted this change. ( https://review.coreboot.org/c/flashrom/+/67722 )

Change subject: layout.c: Validate _layout_entry_by_name() arguments before use
......................................................................

layout.c: Validate _layout_entry_by_name() arguments before use

It may be the case that a layout could not be derived which
would result in layout logic being fed a NULL pointer. Validate
this case and be defensive to validate the name argument as well.

BUG=b:247055486
TEST=builds

Change-Id: I2a19c0e586f8575b8b3c2c02b5afad312efacfc9
Signed-off-by: Edward O'Callaghan 
Reviewed-on: https://review.coreboot.org/c/flashrom/+/67722
Tested-by: build bot (Jenkins) 
Reviewed-by: Angel Pons 
Reviewed-by: Felix Singer 
---
M layout.c
1 file changed, 23 insertions(+), 0 deletions(-)

Approvals:
  build bot (Jenkins): Verified
  Felix Singer: Looks good to me, approved
  Angel Pons: Looks good to me, approved

diff --git a/layout.c b/layout.c
index 5916d66..0212699 100644
--- a/layout.c
+++ b/layout.c
@@ -58,6 +58,8 @@
    	const struct flashrom_layout *const layout, const char *name)
 {
    struct romentry *entry = NULL;
+	if (!layout || !name)
+		return NULL;
    while ((entry = mutable_layout_next(layout, entry))) {
    	if (!strcmp(entry->name, name))
    		return entry;