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efi_loader: fix efi_dp_from_file()

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* When called from efi_dp_from_name() we miss to append the filename
  for non-block devices.
* expand_media_path() could be simplified by using efi_dp_from_file to
  prepend the device path of the boot device.

This can be avoided by passing a device path to efi_dp_from_file() instead
of a block device descriptor and a partition number.

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
This commit is contained in:
Heinrich Schuchardt
2023-05-13 10:36:21 +02:00
parent e1273ea2ec
commit c7c0ca3767
4 changed files with 18 additions and 38 deletions
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39
lib/efi_loader/efi_device_path.c
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@@ -1002,47 +1002,31 @@ static void path_to_uefi(void *uefi, const char *src)
}
/**
* efi_dp_from_file() - create device path for file
* efi_dp_from_file() - append file path node to device path.
*
* The function creates a device path from the block descriptor @desc and the
* partition number @part and appends a device path node created describing the
* file path @path.
*
* If @desc is NULL, the device path will not contain nodes describing the
* partition.
* If @path is an empty string "", the device path will not contain a node
* for the file path.
*
* @desc: block device descriptor or NULL
* @part: partition number
* @path: file path on partition or ""
* @dp: device path or NULL
* @path: file path or NULL
* Return: device path or NULL in case of an error
*/
struct efi_device_path *efi_dp_from_file(struct blk_desc *desc, int part,
const char *path)
struct efi_device_path *efi_dp_from_file(const struct efi_device_path *dp,
const char *path)
{
struct efi_device_path_file_path *fp;
void *buf, *pos;
size_t dpsize = 0, fpsize;
if (desc)
dpsize = dp_part_size(desc, part);
size_t dpsize, fpsize;
dpsize = efi_dp_size(dp);
fpsize = sizeof(struct efi_device_path) +
2 * (utf8_utf16_strlen(path) + 1);
if (fpsize > U16_MAX)
return NULL;
dpsize += fpsize;
buf = efi_alloc(dpsize + sizeof(END));
buf = efi_alloc(dpsize + fpsize + sizeof(END));
if (!buf)
return NULL;
if (desc)
pos = dp_part_fill(buf, desc, part);
else
pos = buf;
memcpy(buf, dp, dpsize);
pos = buf + dpsize;
/* add file-path: */
if (*path) {
@@ -1218,8 +1202,7 @@ efi_status_t efi_dp_from_name(const char *dev, const char *devnr,
if (!path)
return EFI_SUCCESS;
*file = efi_dp_from_file(desc, part, path);
*file = efi_dp_from_file(dp, path);
if (!*file)
return EFI_OUT_OF_RESOURCES;