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* grub-core/fs/hfsplus.c: Make parent unsigned.

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(grub_hfsplus_cmp_catkey): Don't compare using subtraction, it
	overflows.
	(grub_hfsplus_cmp_extkey): Likewise
This commit is contained in:
Dave Vasilevsky 2011-01-03 15:30:41 +01:00 committed by Vladimir 'phcoder' Serbinenko
parent 469ee10a7f
commit 4af0504b72
2 changed files with 28 additions and 12 deletions
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7
ChangeLog
View file

@ -1,3 +1,10 @@
2011-01-03 Dave Vasilevsky <dave@vasilevsky.ca>
* grub-core/fs/hfsplus.c: Make parent unsigned.
(grub_hfsplus_cmp_catkey): Don't compare using subtraction, it
overflows.
(grub_hfsplus_cmp_extkey): Likewise
2011-01-03 Vladimir Serbinenko <phcoder@gmail.com>
* util/grub-install.in: Correctly use bootloader_id and not

33
grub-core/fs/hfsplus.c
View file

@ -178,7 +178,7 @@ enum grub_hfsplus_filetype
/* Internal representation of a catalog key. */
struct grub_hfsplus_catkey_internal
{
int parent;
grub_uint32_t parent;
char *name;
};
@ -520,9 +520,12 @@ grub_hfsplus_cmp_catkey (struct grub_hfsplus_key *keya,
int i;
int diff;
diff = grub_be_to_cpu32 (catkey_a->parent) - catkey_b->parent;
if (diff)
return diff;
/* Safe unsigned comparison */
grub_uint32_t aparent = grub_be_to_cpu32 (catkey_a->parent);
if (aparent > catkey_b->parent)
return 1;
if (aparent < catkey_b->parent)
return -1;
/* Change the filename in keya so the endianness is correct. */
for (i = 0; i < grub_be_to_cpu16 (catkey_a->namelen); i++)
@ -555,15 +558,21 @@ grub_hfsplus_cmp_extkey (struct grub_hfsplus_key *keya,
{
struct grub_hfsplus_extkey *extkey_a = &keya->extkey;
struct grub_hfsplus_extkey_internal *extkey_b = &keyb->extkey;
int diff;
grub_uint32_t akey;
diff = grub_be_to_cpu32 (extkey_a->fileid) - extkey_b->fileid;
if (diff)
return diff;
diff = grub_be_to_cpu32 (extkey_a->start) - extkey_b->start;
return diff;
/* Safe unsigned comparison */
akey = grub_be_to_cpu32 (extkey_a->fileid);
if (akey > extkey_b->fileid)
return 1;
if (akey < extkey_b->fileid)
return -1;
akey = grub_be_to_cpu32 (extkey_a->start);
if (akey > extkey_b->start)
return 1;
if (akey < extkey_b->start)
return -1;
return 0;
}
static char *