From: Heinrich Schuchardt <xypron.glpk@gmx.de>
Date: Thu, 25 Apr 2019 16:41:40 +0000 (+0200)
Subject: efi_loader: FreePages() must fail with pages = 0
X-Git-Url: http://git.dujemihanovic.xyz/img/static/git-logo.png?a=commitdiff_plain;h=e00b82db809725ead77ddfe602c9c8fad1f45ab7;p=u-boot.git

efi_loader: FreePages() must fail with pages = 0

The UEFI spec requires that freeing of pages fails if the number of pages
to be freed is 'invalid'. Check that it is not zero.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
---

diff --git a/lib/efi_loader/efi_memory.c b/lib/efi_loader/efi_memory.c
index 987cc6dc5f..776077cc35 100644
--- a/lib/efi_loader/efi_memory.c
+++ b/lib/efi_loader/efi_memory.c
@@ -452,7 +452,7 @@ efi_status_t efi_free_pages(uint64_t memory, efi_uintn_t pages)
 	uint64_t r = 0;
 
 	/* Sanity check */
-	if (!memory || (memory & EFI_PAGE_MASK)) {
+	if (!memory || (memory & EFI_PAGE_MASK) || !pages) {
 		printf("%s: illegal free 0x%llx, 0x%zx\n", __func__,
 		       memory, pages);
 		return EFI_INVALID_PARAMETER;