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maint: don't leave garbage on early API exit 

Several APIs clear out a user input buffer before attempting to
populate it; but in a few cases we missed this memset if we
detect a reason for an early exit.  Note that these APIs
check for non-NULL arguments, and exit early with an error
message when NULL is passed in; which means that we must be
careful to avoid a NULL deref in order to get to that error
message.  Also, we were inconsistent on the use of
sizeof(virType) vs. sizeof(expression); the latter is more
robust if we ever change the type of the expression (although
such action is unlikely since these types are part of our
public API).

* src/libvirt.c (virDomainGetInfo, virDomainGetBlockInfo)
(virStoragePoolGetInfo, virStorageVolGetInfo)
(virDomainGetJobInfo, virDomainGetBlockJobInfo): Move memset
before any returns.

Signed-off-by: Eric Blake <eblake@redhat.com>
This commit is contained in:
Eric Blake 2013-12-27 16:21:32 -07:00
parent fe89b687a0
commit c05aebfd65
1 changed files with 18 additions and 12 deletions
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30
src/libvirt.c
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@ -4144,11 +4144,12 @@ virDomainGetInfo(virDomainPtr domain, virDomainInfoPtr info)
virResetLastError();
if (info)
memset(info, 0, sizeof(*info));
virCheckDomainReturn(domain, -1);
virCheckNonNullArgGoto(info, error);
memset(info, 0, sizeof(virDomainInfo));
conn = domain->conn;
if (conn->driver->domainGetInfo) {
@ -8449,12 +8450,13 @@ virDomainGetBlockInfo(virDomainPtr domain, const char *disk,
virResetLastError();
if (info)
memset(info, 0, sizeof(*info));
virCheckDomainReturn(domain, -1);
virCheckNonNullArgGoto(disk, error);
virCheckNonNullArgGoto(info, error);
memset(info, 0, sizeof(virDomainBlockInfo));
conn = domain->conn;
if (conn->driver->domainGetBlockInfo) {
@ -13082,11 +13084,12 @@ virStoragePoolGetInfo(virStoragePoolPtr pool,
virResetLastError();
if (info)
memset(info, 0, sizeof(*info));
virCheckStoragePoolReturn(pool, -1);
virCheckNonNullArgGoto(info, error);
memset(info, 0, sizeof(virStoragePoolInfo));
conn = pool->conn;
if (conn->storageDriver->storagePoolGetInfo) {
@ -13951,11 +13954,12 @@ virStorageVolGetInfo(virStorageVolPtr vol,
virResetLastError();
if (info)
memset(info, 0, sizeof(*info));
virCheckStorageVolReturn(vol, -1);
virCheckNonNullArgGoto(info, error);
memset(info, 0, sizeof(virStorageVolInfo));
conn = vol->conn;
if (conn->storageDriver->storageVolGetInfo){
@ -17240,11 +17244,12 @@ virDomainGetJobInfo(virDomainPtr domain, virDomainJobInfoPtr info)
virResetLastError();
if (info)
memset(info, 0, sizeof(*info));
virCheckDomainReturn(domain, -1);
virCheckNonNullArgGoto(info, error);
memset(info, 0, sizeof(virDomainJobInfo));
conn = domain->conn;
if (conn->driver->domainGetJobInfo) {
@ -19379,14 +19384,15 @@ virDomainGetBlockJobInfo(virDomainPtr dom, const char *disk,
virResetLastError();
if (info)
memset(info, 0, sizeof(*info));
virCheckDomainReturn(dom, -1);
conn = dom->conn;
virCheckNonNullArgGoto(disk, error);
virCheckNonNullArgGoto(info, error);
memset(info, 0, sizeof(*info));
if (conn->driver->domainGetBlockJobInfo) {
int ret;
ret = conn->driver->domainGetBlockJobInfo(dom, disk, info, flags);