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chainloader: Fix gcc9 error -Waddress-of-packed-member

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The address of fp->path_name could be unaligned since seeking into the
device path buffer for a given node could end in byte boundary.

The fix is using aligned buffer allocated by grub_malloc for receiving
the converted UTF16 string by grub_utf8_to_utf16 and also the processing
after. The resulting string then gets copied to fp->path_name.

[  243s] ../../grub-core/loader/efi/chainloader.c: In function 'copy_file_path':
[  243s] ../../grub-core/loader/efi/chainloader.c:136:32: error: taking address of packed member of 'struct grub_efi_file_path_device_path' may result in an unaligned pointer value [-Werror=address-of-packed-member]
[  243s]   136 |   size = grub_utf8_to_utf16 (fp->path_name, len * GRUB_MAX_UTF16_PER_UTF8,
[  243s]       |                              ~~^~~~~~~~~~~
[  243s] ../../grub-core/loader/efi/chainloader.c:138:12: error: taking address of packed member of 'struct grub_efi_file_path_device_path' may result in an unaligned pointer value [-Werror=address-of-packed-member]
[  243s]   138 |   for (p = fp->path_name; p < fp->path_name + size; p++)
[  243s]       |            ^~

Signed-off-by: Michael Chang <mchang@suse.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
This commit is contained in:
Michael Chang 2019-04-11 17:14:08 +08:00 committed by Daniel Kiper
parent 85e08e174e
commit 4868e17507
1 changed files with 9 additions and 3 deletions
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12
grub-core/loader/efi/chainloader.c
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@ -110,21 +110,27 @@ static void
copy_file_path (grub_efi_file_path_device_path_t *fp,
const char *str, grub_efi_uint16_t len)
{
grub_efi_char16_t *p;
grub_efi_char16_t *p, *path_name;
grub_efi_uint16_t size;
fp->header.type = GRUB_EFI_MEDIA_DEVICE_PATH_TYPE;
fp->header.subtype = GRUB_EFI_FILE_PATH_DEVICE_PATH_SUBTYPE;
size = grub_utf8_to_utf16 (fp->path_name, len * GRUB_MAX_UTF16_PER_UTF8,
path_name = grub_malloc (len * GRUB_MAX_UTF16_PER_UTF8 * sizeof (*path_name));
if (!path_name)
return;
size = grub_utf8_to_utf16 (path_name, len * GRUB_MAX_UTF16_PER_UTF8,
(const grub_uint8_t *) str, len, 0);
for (p = fp->path_name; p < fp->path_name + size; p++)
for (p = path_name; p < path_name + size; p++)
if (*p == '/')
*p = '\\';
grub_memcpy (fp->path_name, path_name, size * sizeof (*fp->path_name));
/* File Path is NULL terminated */
fp->path_name[size++] = '\0';
fp->header.length = size * sizeof (grub_efi_char16_t) + sizeof (*fp);
grub_free (path_name);
}
static grub_efi_device_path_t *