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hfsplus: Fix gcc9 error with -Waddress-of-packed-member 

The catkey->name could be unaligned since the address of 'void* record'
is calculated as offset in bytes to a malloc buffer.

The fix is using aligned buffer allocated by grub_malloc for holding
the UTF16 string copied from catkey->name. And use that buffer as
argument for grub_utf16_to_utf8 to convert to UTF8 strings.

In addition, using a new copy of buffer rather than catkey->name itself
for processing the endianess conversion, we can also get rid of the hunk
restoring byte order of catkey->name to what it was previously.

[   59s] ../grub-core/fs/hfsplus.c: In function 'list_nodes':
[   59s] ../grub-core/fs/hfsplus.c:738:57: error: taking address of packed member of 'struct grub_hfsplus_catkey' may result in an unaligned pointer value [-Werror=address-of-packed-member]
[   59s]   738 |   *grub_utf16_to_utf8 ((grub_uint8_t *) filename, catkey->name,
[   59s]       |                                                   ~~~~~~^~~~~~
[   59s] ../grub-core/fs/hfsplus.c: In function 'grub_hfsplus_label':
[   59s] ../grub-core/fs/hfsplus.c:1019:57: error: taking address of packed member of 'struct grub_hfsplus_catkey' may result in an unaligned pointer value [-Werror=address-of-packed-member]
[   59s]  1019 |   *grub_utf16_to_utf8 ((grub_uint8_t *) (*label), catkey->name,
[   59s]       |                                                   ~~~~~~^~~~~~

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 17:14:05 +08:00 committed by Daniel Kiper
parent 0e49748fad
commit 621024090b
1 changed files with 40 additions and 17 deletions
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57
grub-core/fs/hfsplus.c
View File

@ -661,6 +661,7 @@ list_nodes (void *record, void *hook_arg)
char *filename;
int i;
struct grub_fshelp_node *node;
grub_uint16_t *keyname;
struct grub_hfsplus_catfile *fileinfo;
enum grub_fshelp_filetype type = GRUB_FSHELP_UNKNOWN;
struct list_nodes_ctx *ctx = hook_arg;
@ -719,32 +720,34 @@ list_nodes (void *record, void *hook_arg)
if (! filename)
return 0;
keyname = grub_malloc (grub_be_to_cpu16 (catkey->namelen) * sizeof (*keyname));
if (!keyname)
{
grub_free (filename);
return 0;
}
/* Make sure the byte order of the UTF16 string is correct. */
for (i = 0; i < grub_be_to_cpu16 (catkey->namelen); i++)
{
catkey->name[i] = grub_be_to_cpu16 (catkey->name[i]);
keyname[i] = grub_be_to_cpu16 (catkey->name[i]);
if (catkey->name[i] == '/')
catkey->name[i] = ':';
if (keyname[i] == '/')
keyname[i] = ':';
/* If the name is obviously invalid, skip this node. */
if (catkey->name[i] == 0)
if (keyname[i] == 0)
{
grub_free (keyname);
grub_free (filename);
return 0;
}
}
*grub_utf16_to_utf8 ((grub_uint8_t *) filename, catkey->name,
*grub_utf16_to_utf8 ((grub_uint8_t *) filename, keyname,
grub_be_to_cpu16 (catkey->namelen)) = '\0';
/* Restore the byte order to what it was previously. */
for (i = 0; i < grub_be_to_cpu16 (catkey->namelen); i++)
{
if (catkey->name[i] == ':')
catkey->name[i] = '/';
catkey->name[i] = grub_be_to_cpu16 (catkey->name[i]);
}
grub_free (keyname);
/* hfs+ is case insensitive. */
if (! ctx->dir->data->case_sensitive)
@ -975,6 +978,7 @@ grub_hfsplus_label (grub_device_t device, char **label)
grub_disk_t disk = device->disk;
struct grub_hfsplus_catkey *catkey;
int i, label_len;
grub_uint16_t *label_name;
struct grub_hfsplus_key_internal intern;
struct grub_hfsplus_btnode *node = NULL;
grub_disk_addr_t ptr = 0;
@ -1003,22 +1007,41 @@ grub_hfsplus_label (grub_device_t device, char **label)
grub_hfsplus_btree_recptr (&data->catalog_tree, node, ptr);
label_len = grub_be_to_cpu16 (catkey->namelen);
label_name = grub_malloc (label_len * sizeof (*label_name));
if (!label_name)
{
grub_free (node);
grub_free (data);
return grub_errno;
}
for (i = 0; i < label_len; i++)
{
catkey->name[i] = grub_be_to_cpu16 (catkey->name[i]);
label_name[i] = grub_be_to_cpu16 (catkey->name[i]);
/* If the name is obviously invalid, skip this node. */
if (catkey->name[i] == 0)
return 0;
if (label_name[i] == 0)
{
grub_free (label_name);
grub_free (node);
grub_free (data);
return 0;
}
}
*label = grub_malloc (label_len * GRUB_MAX_UTF8_PER_UTF16 + 1);
if (! *label)
return grub_errno;
{
grub_free (label_name);
grub_free (node);
grub_free (data);
return grub_errno;
}
*grub_utf16_to_utf8 ((grub_uint8_t *) (*label), catkey->name,
*grub_utf16_to_utf8 ((grub_uint8_t *) (*label), label_name,
label_len) = '\0';
grub_free (label_name);
grub_free (node);
grub_free (data);