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qcow2-refcount: Sanitize refcount table entry

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When reading the refcount table entry in get_refcount(), only bits which
are actually significant for the refcount block offset should be taken
into account.

Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Max Reitz 2014-03-07 23:10:12 +01:00 committed by Stefan Hajnoczi
parent 750036a848
commit 26d49c4675
1 changed files with 2 additions and 1 deletions
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3
block/qcow2-refcount.c
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@ -96,7 +96,8 @@ static int get_refcount(BlockDriverState *bs, int64_t cluster_index)
refcount_table_index = cluster_index >> (s->cluster_bits - REFCOUNT_SHIFT);
if (refcount_table_index >= s->refcount_table_size)
return 0;
refcount_block_offset = s->refcount_table[refcount_table_index];
refcount_block_offset =
s->refcount_table[refcount_table_index] & REFT_OFFSET_MASK;
if (!refcount_block_offset)
return 0;