On 2012年11月28日 21:34, Ján Tomko wrote:
In a few places, the return value could get passed to VIR_ALLOC_N without
being checked, resulting in a request to allocate a lot of memory if the
return value was negative.
Isn't it expected to fail? calloc fails that on Linux, but not sure what
the behaviour on other platform.
---
src/conf/domain_conf.c | 8 ++++++--
src/conf/storage_conf.c | 4 +++-
2 files changed, 9 insertions(+), 3 deletions(-)
diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index 2ca608f..814859a 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -3258,7 +3258,9 @@ virSecurityLabelDefsParseXML(virDomainDefPtr def,
saved_node = ctxt->node;
/* Allocate a security labels based on XML */
- if ((n = virXPathNodeSet("./seclabel", ctxt,&list)) == 0)
+ if ((n = virXPathNodeSet("./seclabel", ctxt,&list))< 0)
+ goto error;
+ if (n == 0)
return 0;
but anyway, this is good fix, even calloc will fails, the error just
points to the wrong direction.
if (VIR_ALLOC_N(def->seclabels, n)< 0) {
@@ -3345,7 +3347,9 @@
virSecurityDeviceLabelDefParseXML(virSecurityDeviceLabelDefPtr **seclabels_rtn,
virSecurityLabelDefPtr vmDef = NULL;
char *model, *relabel, *label;
- if ((n = virXPathNodeSet("./seclabel", ctxt,&list)) == 0)
+ if ((n = virXPathNodeSet("./seclabel", ctxt,&list))< 0)
+ goto error;
+ if (n == 0)
return 0;
if (VIR_ALLOC_N(seclabels, n)< 0) {
diff --git a/src/conf/storage_conf.c b/src/conf/storage_conf.c
index 5a2cf1b..feeba17 100644
--- a/src/conf/storage_conf.c
+++ b/src/conf/storage_conf.c
@@ -510,7 +510,9 @@ virStoragePoolDefParseSource(xmlXPathContextPtr ctxt,
VIR_FREE(format);
}
- source->nhost = virXPathNodeSet("./host", ctxt,&nodeset);
+ if ((i = virXPathNodeSet("./host", ctxt,&nodeset))< 0)
+ goto cleanup;
+ source->nhost = i;
I'd like have a new var like "n", instead of reusing "i", which
is used for loop index in convention.
if (source->nhost) {
if (VIR_ALLOC_N(source->hosts, source->nhost)< 0) {
ACK. I will use "n" when pushing.
Osier
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