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* grub-core/fs/btrfs.c: Avoid divisions by zero.

This commit is contained in:
Vladimir Serbinenko 2015-01-20 17:36:29 +01:00
parent 065ed900d4
commit 9deb46e363
2 changed files with 25 additions and 14 deletions
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4
ChangeLog
View File

@ -1,3 +1,7 @@
2015-01-20 Vladimir Serbinenko <phcoder@gmail.com>
* grub-core/fs/btrfs.c: Avoid divisions by zero.
2015-01-20 Vladimir Serbinenko <phcoder@gmail.com>
* grub-core/lib/pbkdf2.c (grub_crypto_pbkdf2): Check that hash len is not 0.

35
grub-core/fs/btrfs.c
View File

@ -680,6 +680,8 @@ grub_btrfs_read_logical (struct grub_btrfs_data *data, grub_disk_addr_t addr,
grub_uint64_t stripen;
grub_uint64_t stripe_offset;
grub_uint64_t off = addr - grub_le_to_cpu64 (key->offset);
grub_uint64_t chunk_stripe_length;
grub_uint16_t nstripes;
unsigned redundancy = 1;
unsigned i, j;
@ -690,15 +692,17 @@ grub_btrfs_read_logical (struct grub_btrfs_data *data, grub_disk_addr_t addr,
"couldn't find the chunk descriptor");
}
nstripes = grub_le_to_cpu16 (chunk->nstripes) ? : 1;
chunk_stripe_length = grub_le_to_cpu64 (chunk->stripe_length) ? : 512;
grub_dprintf ("btrfs", "chunk 0x%" PRIxGRUB_UINT64_T
"+0x%" PRIxGRUB_UINT64_T
" (%d stripes (%d substripes) of %"
PRIxGRUB_UINT64_T ")\n",
grub_le_to_cpu64 (key->offset),
grub_le_to_cpu64 (chunk->size),
grub_le_to_cpu16 (chunk->nstripes),
nstripes,
grub_le_to_cpu16 (chunk->nsubstripes),
grub_le_to_cpu64 (chunk->stripe_length));
chunk_stripe_length);
switch (grub_le_to_cpu64 (chunk->type)
& ~GRUB_BTRFS_CHUNK_TYPE_BITS_DONTCARE)
@ -708,8 +712,10 @@ grub_btrfs_read_logical (struct grub_btrfs_data *data, grub_disk_addr_t addr,
grub_uint64_t stripe_length;
grub_dprintf ("btrfs", "single\n");
stripe_length = grub_divmod64 (grub_le_to_cpu64 (chunk->size),
grub_le_to_cpu16 (chunk->nstripes),
nstripes,
NULL);
if (stripe_length == 0)
stripe_length = 512;
stripen = grub_divmod64 (off, stripe_length, &stripe_offset);
csize = (stripen + 1) * stripe_length - off;
break;
@ -730,33 +736,34 @@ grub_btrfs_read_logical (struct grub_btrfs_data *data, grub_disk_addr_t addr,
grub_uint64_t low;
grub_dprintf ("btrfs", "RAID0\n");
middle = grub_divmod64 (off,
grub_le_to_cpu64 (chunk->stripe_length),
chunk_stripe_length,
&low);
high = grub_divmod64 (middle, grub_le_to_cpu16 (chunk->nstripes),
high = grub_divmod64 (middle, nstripes,
&stripen);
stripe_offset =
low + grub_le_to_cpu64 (chunk->stripe_length) * high;
csize = grub_le_to_cpu64 (chunk->stripe_length) - low;
low + chunk_stripe_length * high;
csize = chunk_stripe_length - low;
break;
}
case GRUB_BTRFS_CHUNK_TYPE_RAID10:
{
grub_uint64_t middle, high;
grub_uint64_t low;
grub_uint16_t nsubstripes;
nsubstripes = grub_le_to_cpu16 (chunk->nsubstripes) ? : 1;
middle = grub_divmod64 (off,
grub_le_to_cpu64 (chunk->stripe_length),
chunk_stripe_length,
&low);
high = grub_divmod64 (middle,
grub_le_to_cpu16 (chunk->nstripes)
/ grub_le_to_cpu16 (chunk->nsubstripes),
nstripes / nsubstripes ? : 1,
&stripen);
stripen *= grub_le_to_cpu16 (chunk->nsubstripes);
redundancy = grub_le_to_cpu16 (chunk->nsubstripes);
stripe_offset = low + grub_le_to_cpu64 (chunk->stripe_length)
stripen *= nsubstripes;
redundancy = nsubstripes;
stripe_offset = low + chunk_stripe_length
* high;
csize = grub_le_to_cpu64 (chunk->stripe_length) - low;
csize = chunk_stripe_length - low;
break;
}
default: