[PATCH v8 12/18] luks2: grub_cryptodisk_t->total_sectors is the max number of device native sectors

[Glenn Washburn]

We need to convert the sectors from the size of the underlying device to the
cryptodisk sector size; segment.size is in bytes which need to be converted
to cryptodisk sectors as well.

Also, removed an empty statement.

Signed-off-by: Glenn Washburn <development@efficientek.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
---
 grub-core/disk/luks2.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/grub-core/disk/luks2.c b/grub-core/disk/luks2.c
index ebf03e77b..429a4cfa1 100644
--- a/grub-core/disk/luks2.c
+++ b/grub-core/disk/luks2.c
@@ -429,7 +429,7 @@ luks2_decrypt_key (grub_uint8_t *out_key,
   grub_uint8_t salt[GRUB_CRYPTODISK_MAX_KEYLEN];
   grub_uint8_t *split_key = NULL;
   grub_size_t saltlen = sizeof (salt);
-  char cipher[32], *p;;
+  char cipher[32], *p;
   const gcry_md_spec_t *hash;
   gcry_err_code_t gcry_ret;
   grub_err_t ret;
@@ -615,9 +615,10 @@ luks2_recover_key (grub_disk_t source,
       crypt->log_sector_size = sizeof (unsigned int) * 8
                - __builtin_clz ((unsigned int) segment.sector_size) - 1;
       if (grub_strcmp (segment.size, "dynamic") == 0)
-       crypt->total_sectors = grub_disk_get_size (source) - 
crypt->offset_sectors;
+       crypt->total_sectors = (grub_disk_get_size (source) >> 
(crypt->log_sector_size - source->log_sector_size))
+                              - crypt->offset_sectors;
       else
-       crypt->total_sectors = grub_strtoull (segment.size, NULL, 10);
+       crypt->total_sectors = grub_strtoull (segment.size, NULL, 10) >> 
crypt->log_sector_size;
 
       ret = luks2_decrypt_key (candidate_key, source, crypt, &keyslot,
                               (const grub_uint8_t *) passphrase, grub_strlen 
(passphrase));
-- 
2.27.0