mirror of https://github.com/proxmox/mirror_qemu
qcow2: fix range check
QCowL2Meta::offset is not cluster aligned but only sector aligned however nb_clusters count cluster from cluster start. This fix range check. Note that old code have no corruption issues related to this check cause it only cause intersection to occur when shouldn't. Signed-off-by: Frediano Ziglio <freddy77@gmail.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>master
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dea43a65d6
commit
ee18e73023
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@ -776,17 +776,17 @@ again:
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*/
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QLIST_FOREACH(old_alloc, &s->cluster_allocs, next_in_flight) {
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uint64_t end_offset = offset + nb_clusters * s->cluster_size;
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uint64_t old_offset = old_alloc->offset;
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uint64_t old_end_offset = old_alloc->offset +
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old_alloc->nb_clusters * s->cluster_size;
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uint64_t start = offset >> s->cluster_bits;
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uint64_t end = start + nb_clusters;
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uint64_t old_start = old_alloc->offset >> s->cluster_bits;
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uint64_t old_end = old_start + old_alloc->nb_clusters;
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if (end_offset < old_offset || offset > old_end_offset) {
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if (end < old_start || start > old_end) {
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/* No intersection */
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} else {
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if (offset < old_offset) {
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if (start < old_start) {
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/* Stop at the start of a running allocation */
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nb_clusters = (old_offset - offset) >> s->cluster_bits;
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nb_clusters = old_start - start;
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} else {
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nb_clusters = 0;
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}
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