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qcow2: Add bounds check to get_refblock_offset()

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Reported-by: R. Nageswara Sastry <nasastry@in.ibm.com>
Buglink: https://bugs.launchpad.net/qemu/+bug/1728661
Signed-off-by: Max Reitz <mreitz@redhat.com>
Message-id: 20171110203111.7666-5-mreitz@redhat.com
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
Signed-off-by: Max Reitz <mreitz@redhat.com>
This commit is contained in:
Max Reitz 2017-11-10 21:31:10 +01:00
parent d470ad42ac
commit 23482f8a60
4 changed files with 93 additions and 7 deletions
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6
block/qcow2.h
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@ -527,12 +527,6 @@ uint32_t offset_to_reftable_index(BDRVQcow2State *s, uint64_t offset)
return offset >> (s->refcount_block_bits + s->cluster_bits);
}
static inline uint64_t get_refblock_offset(BDRVQcow2State *s, uint64_t offset)
{
uint32_t index = offset_to_reftable_index(s, offset);
return s->refcount_table[index] & REFT_OFFSET_MASK;
}
/* qcow2.c functions */
int qcow2_backing_read1(BlockDriverState *bs, QEMUIOVector *qiov,
int64_t sector_num, int nb_sectors);