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virsh: Don't infloop on snapshot/storage_vol failure

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Most of our completers used the pattern:
if ((nITEM = virITEMListAll()) < 0)
    return NULL;

but the virDomainSnapshot and virStorageVolume completers were instead
using goto error. If the ListAll fails with -1, the cleanup label was
running a loop of 'size_t i < int nITEM', which is an extreme waste of
CPU cycles. Broken since their introduction in v4.1.

Fixes: f81f8b62
Fixes: 4cb4b649
Reported-by: Ján Tomko <jtomko@redhat.com>
Signed-off-by: Eric Blake <eblake@redhat.com>
This commit is contained in:
Eric Blake 2019-03-27 21:15:43 -05:00
parent 83b1808ca2
commit 24b092c404
1 changed files with 6 additions and 2 deletions
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8
tools/virsh-completer.c
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@ -278,6 +278,7 @@ virshStorageVolNameCompleter(vshControl *ctl,
virshControlPtr priv = ctl->privData;
virStoragePoolPtr pool = NULL;
virStorageVolPtr *vols = NULL;
int rc;
int nvols = 0;
size_t i = 0;
char **ret = NULL;
@ -290,8 +291,9 @@ virshStorageVolNameCompleter(vshControl *ctl,
if (!(pool = virshCommandOptPool(ctl, cmd, "pool", NULL)))
return NULL;
if ((nvols = virStoragePoolListAllVolumes(pool, &vols, flags)) < 0)
if ((rc = virStoragePoolListAllVolumes(pool, &vols, flags)) < 0)
goto error;
nvols = rc;
if (VIR_ALLOC_N(ret, nvols + 1) < 0)
goto error;
@ -631,6 +633,7 @@ virshSnapshotNameCompleter(vshControl *ctl,
virshControlPtr priv = ctl->privData;
virDomainPtr dom = NULL;
virDomainSnapshotPtr *snapshots = NULL;
int rc;
int nsnapshots = 0;
size_t i = 0;
char **ret = NULL;
@ -643,8 +646,9 @@ virshSnapshotNameCompleter(vshControl *ctl,
if (!(dom = virshCommandOptDomain(ctl, cmd, NULL)))
return NULL;
if ((nsnapshots = virDomainListAllSnapshots(dom, &snapshots, flags)) < 0)
if ((rc = virDomainListAllSnapshots(dom, &snapshots, flags)) < 0)
goto error;
nsnapshots = rc;
if (VIR_ALLOC_N(ret, nsnapshots + 1) < 0)
goto error;