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partitions/efi: compare first and last usable LBAs

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When verifying GPT header integrity, make sure that first usable LBA is
smaller than last usable LBA.

Signed-off-by: Davidlohr Bueso <davidlohr@hp.com>
Reviewed-by: Karel Zak <kzak@redhat.com>
Acked-by: Matt Fleming <matt.fleming@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Davidlohr Bueso 2013-09-11 14:25:01 -07:00 committed by Linus Torvalds
parent 27a7c64217
commit aa054bc937
1 changed files with 6 additions and 1 deletions
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7
block/partitions/efi.c
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@ -410,7 +410,12 @@ static int is_gpt_valid(struct parsed_partitions *state, u64 lba,
(unsigned long long)lastlba); (unsigned long long)lastlba);
goto fail; goto fail;
} }
if (le64_to_cpu((*gpt)->last_usable_lba) < le64_to_cpu((*gpt)->first_usable_lba)) {
pr_debug("GPT: last_usable_lba incorrect: %lld > %lld\n",
(unsigned long long)le64_to_cpu((*gpt)->last_usable_lba),
(unsigned long long)le64_to_cpu((*gpt)->first_usable_lba));
goto fail;
}
/* Check that sizeof_partition_entry has the correct value */ /* Check that sizeof_partition_entry has the correct value */
if (le32_to_cpu((*gpt)->sizeof_partition_entry) != sizeof(gpt_entry)) { if (le32_to_cpu((*gpt)->sizeof_partition_entry) != sizeof(gpt_entry)) {
pr_debug("GUID Partitition Entry Size check failed.\n"); pr_debug("GUID Partitition Entry Size check failed.\n");