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qemu-img rebase: Fix output image corruption 

qemu-img rebase must always give clusters in the COW file priority over those
in the backing file. As it failed to use number of non-allocated clusters but
assumed the maximum, it was possible that allocated clusters were taken from
the backing file instead, leading to a corrupted output image.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Kevin Wolf 2010-04-29 14:47:48 +02:00
parent 294cc35f3d
commit cc60e327c0
1 changed files with 3 additions and 3 deletions
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6
qemu-img.c
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@ -1136,7 +1136,7 @@ static int img_rebase(int argc, char **argv)
if (!unsafe) {
uint64_t num_sectors;
uint64_t sector;
int n, n1;
int n;
uint8_t * buf_old;
uint8_t * buf_new;
@ -1155,8 +1155,8 @@ static int img_rebase(int argc, char **argv)
}
/* If the cluster is allocated, we don't need to take action */
if (bdrv_is_allocated(bs, sector, n, &n1)) {
n = n1;
ret = bdrv_is_allocated(bs, sector, n, &n);
if (ret) {
continue;
}