From 07836345ba6da5cdad2bbdc43923604d256645f3 Mon Sep 17 00:00:00 2001 From: Heinrich Schuchardt Date: Mon, 16 Apr 2018 07:59:06 +0200 Subject: [PATCH] efi_loader: fix AppendDevicePath The logic of the AppendDevicePath service of the EFI_DEVICE_PATH_UTILITIES_PROTOCOL is incorrectly implemented: * if both paths are NULL an end node has to be returned * if both paths are not NULL the end node of the second device path has to be kept Signed-off-by: Heinrich Schuchardt Signed-off-by: Alexander Graf --- lib/efi_loader/efi_device_path.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) diff --git a/lib/efi_loader/efi_device_path.c b/lib/efi_loader/efi_device_path.c index 0cd0b45..9b4d9ae 100644 --- a/lib/efi_loader/efi_device_path.c +++ b/lib/efi_loader/efi_device_path.c @@ -263,7 +263,10 @@ struct efi_device_path *efi_dp_append(const struct efi_device_path *dp1, { struct efi_device_path *ret; - if (!dp1) { + if (!dp1 && !dp2) { + /* return an end node */ + ret = efi_dp_dup(&END); + } else if (!dp1) { ret = efi_dp_dup(dp2); } else if (!dp2) { ret = efi_dp_dup(dp1); @@ -275,8 +278,8 @@ struct efi_device_path *efi_dp_append(const struct efi_device_path *dp1, if (!p) return NULL; memcpy(p, dp1, sz1); - memcpy(p + sz1, dp2, sz2); - memcpy(p + sz1 + sz2, &END, sizeof(END)); + /* the end node of the second device path has to be retained */ + memcpy(p + sz1, dp2, sz2 + sizeof(END)); ret = p; }