From: Stefan Brüns <stefan.bruens@rwth-aachen.de>
Date: Sat, 1 Oct 2016 21:32:29 +0000 (+0200)
Subject: efi_loader: Do not leak memory when unlinking a mapping
X-Git-Tag: v2016.11-rc3~84^2~22
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=511d0b97ef709d13da4922fb694d55ef9a5ef641;p=platform%2Fkernel%2Fu-boot.git

efi_loader: Do not leak memory when unlinking a mapping

As soon as a mapping is unlinked from the list, there are no further
references to it, so it should be freed. If it not unlinked,
update the start address and length.

Signed-off-by: Stefan Brüns <stefan.bruens@rwth-aachen.de>
Reviewed-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Alexander Graf <agraf@suse.de>
---

diff --git a/lib/efi_loader/efi_memory.c b/lib/efi_loader/efi_memory.c
index 742bc90..95aa590 100644
--- a/lib/efi_loader/efi_memory.c
+++ b/lib/efi_loader/efi_memory.c
@@ -116,10 +116,13 @@ static int efi_mem_carve_out(struct efi_mem_list *map,
 		if (map_end == carve_end) {
 			/* Full overlap, just remove map */
 			list_del(&map->link);
+			free(map);
+		} else {
+			map->desc.physical_start = carve_end;
+			map->desc.num_pages = (map_end - carve_end)
+					      >> EFI_PAGE_SHIFT;
 		}
 
-		map_desc->physical_start = carve_end;
-		map_desc->num_pages = (map_end - carve_end) >> EFI_PAGE_SHIFT;
 		return (carve_end - carve_start) >> EFI_PAGE_SHIFT;
 	}