Message ID | 1378695482-29805-2-git-send-email-xiawenc@linux.vnet.ibm.com |
---|---|
State | New |
Headers | show |
On 09/08/2013 08:57 PM, Wenchao Xia wrote: > If it is not restored after qcow2_write_snapshots() fail, a core > dump will happen in bdrv_close() since access of invalid pointer. > > Signed-off-by: Wenchao Xia <xiawenc@linux.vnet.ibm.com> > --- > block/qcow2-snapshot.c | 4 +++- > 1 files changed, 3 insertions(+), 1 deletions(-) Reviewed-by: Eric Blake <eblake@redhat.com>
On Mon, Sep 09, 2013 at 10:57:56AM +0800, Wenchao Xia wrote: > If it is not restored after qcow2_write_snapshots() fail, a core > dump will happen in bdrv_close() since access of invalid pointer. > > Signed-off-by: Wenchao Xia <xiawenc@linux.vnet.ibm.com> > --- > block/qcow2-snapshot.c | 4 +++- > 1 files changed, 3 insertions(+), 1 deletions(-) Good candidate for -stable. Please add: Cc: qemu-stable@nongnu.org
diff --git a/block/qcow2-snapshot.c b/block/qcow2-snapshot.c index e7e6013..40393b2 100644 --- a/block/qcow2-snapshot.c +++ b/block/qcow2-snapshot.c @@ -331,7 +331,7 @@ int qcow2_snapshot_create(BlockDriverState *bs, QEMUSnapshotInfo *sn_info) QCowSnapshot *new_snapshot_list = NULL; QCowSnapshot *old_snapshot_list = NULL; QCowSnapshot sn1, *sn = &sn1; - int i, ret; + int i, ret, old_snapshot_num = 0; uint64_t *l1_table = NULL; int64_t l1_table_offset; @@ -403,6 +403,7 @@ int qcow2_snapshot_create(BlockDriverState *bs, QEMUSnapshotInfo *sn_info) memcpy(new_snapshot_list, s->snapshots, s->nb_snapshots * sizeof(QCowSnapshot)); old_snapshot_list = s->snapshots; + old_snapshot_num = s->nb_snapshots; } s->snapshots = new_snapshot_list; s->snapshots[s->nb_snapshots++] = *sn; @@ -411,6 +412,7 @@ int qcow2_snapshot_create(BlockDriverState *bs, QEMUSnapshotInfo *sn_info) if (ret < 0) { g_free(s->snapshots); s->snapshots = old_snapshot_list; + s->nb_snapshots = old_snapshot_num; goto fail; }
If it is not restored after qcow2_write_snapshots() fail, a core dump will happen in bdrv_close() since access of invalid pointer. Signed-off-by: Wenchao Xia <xiawenc@linux.vnet.ibm.com> --- block/qcow2-snapshot.c | 4 +++- 1 files changed, 3 insertions(+), 1 deletions(-)