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efi_loader: fix AppendDevicePath

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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 <xypron.glpk@gmx.de>
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Heinrich Schuchardt 2018-04-16 07:59:06 +02:00 committed by Alexander Graf
parent 211314c107
commit 07836345ba
1 changed files with 6 additions and 3 deletions
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9
lib/efi_loader/efi_device_path.c
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@ -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;
}