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[libvirt] [PATCH] More paranoid initialization of 'nparams' variable in dispatch code



From: "Daniel P. Berrange" <berrange redhat com>

Since the 'nparams' variable passed to virTypedParametersFree is
supposed to represent the size of the 'params' array, it is bad
practice to initialize it to a non-zero value, until the array
has been allocated.

Signed-off-by: Daniel P. Berrange <berrange redhat com>
---
 daemon/remote.c | 78 ++++++++++++++++++++++++++++++++-------------------------
 1 file changed, 44 insertions(+), 34 deletions(-)

diff --git a/daemon/remote.c b/daemon/remote.c
index e5e3f2c..c5567f4 100644
--- a/daemon/remote.c
+++ b/daemon/remote.c
@@ -1001,7 +1001,7 @@ remoteDispatchDomainGetSchedulerParameters(virNetServerPtr server ATTRIBUTE_UNUS
 {
     virDomainPtr dom = NULL;
     virTypedParameterPtr params = NULL;
-    int nparams = args->nparams;
+    int nparams = 0;
     int rv = -1;
     struct daemonClientPrivate *priv =
         virNetServerClientGetPrivateData(client);
@@ -1011,12 +1011,13 @@ remoteDispatchDomainGetSchedulerParameters(virNetServerPtr server ATTRIBUTE_UNUS
         goto cleanup;
     }
 
-    if (nparams > REMOTE_DOMAIN_SCHEDULER_PARAMETERS_MAX) {
+    if (args->nparams > REMOTE_DOMAIN_SCHEDULER_PARAMETERS_MAX) {
         virReportError(VIR_ERR_INTERNAL_ERROR, "%s", _("nparams too large"));
         goto cleanup;
     }
-    if (nparams && VIR_ALLOC_N(params, nparams) < 0)
+    if (args->nparams && VIR_ALLOC_N(params, args->nparams) < 0)
         goto no_memory;
+    nparams = args->nparams;
 
     if (!(dom = get_nonnull_domain(priv->conn, args->dom)))
         goto cleanup;
@@ -1109,7 +1110,7 @@ remoteDispatchDomainGetSchedulerParametersFlags(virNetServerPtr server ATTRIBUTE
 {
     virDomainPtr dom = NULL;
     virTypedParameterPtr params = NULL;
-    int nparams = args->nparams;
+    int nparams = 0;
     int rv = -1;
     struct daemonClientPrivate *priv =
         virNetServerClientGetPrivateData(client);
@@ -1119,12 +1120,13 @@ remoteDispatchDomainGetSchedulerParametersFlags(virNetServerPtr server ATTRIBUTE
         goto cleanup;
     }
 
-    if (nparams > REMOTE_DOMAIN_SCHEDULER_PARAMETERS_MAX) {
+    if (args->nparams > REMOTE_DOMAIN_SCHEDULER_PARAMETERS_MAX) {
         virReportError(VIR_ERR_INTERNAL_ERROR, "%s", _("nparams too large"));
         goto cleanup;
     }
-    if (nparams && VIR_ALLOC_N(params, nparams) < 0)
+    if (args->nparams && VIR_ALLOC_N(params, args->nparams) < 0)
         goto no_memory;
+    nparams = args->nparams;
 
     if (!(dom = get_nonnull_domain(priv->conn, args->dom)))
         goto cleanup;
@@ -1284,7 +1286,7 @@ remoteDispatchDomainBlockStatsFlags(virNetServerPtr server ATTRIBUTE_UNUSED,
     virTypedParameterPtr params = NULL;
     virDomainPtr dom = NULL;
     const char *path = args->path;
-    int nparams = args->nparams;
+    int nparams = 0;
     unsigned int flags;
     int rv = -1;
     struct daemonClientPrivate *priv =
@@ -1299,14 +1301,15 @@ remoteDispatchDomainBlockStatsFlags(virNetServerPtr server ATTRIBUTE_UNUSED,
         goto cleanup;
     flags = args->flags;
 
-    if (nparams > REMOTE_DOMAIN_BLOCK_STATS_PARAMETERS_MAX) {
+    if (args->nparams > REMOTE_DOMAIN_BLOCK_STATS_PARAMETERS_MAX) {
         virReportError(VIR_ERR_INTERNAL_ERROR, "%s", _("nparams too large"));
         goto cleanup;
     }
-    if (nparams && VIR_ALLOC_N(params, nparams) < 0) {
+    if (args->nparams && VIR_ALLOC_N(params, args->nparams) < 0) {
         virReportOOMError();
         goto cleanup;
     }
+    nparams = args->nparams;
 
     if (virDomainBlockStatsFlags(dom, path, params, &nparams, flags) < 0)
         goto cleanup;
@@ -1913,7 +1916,7 @@ remoteDispatchDomainGetMemoryParameters(virNetServerPtr server ATTRIBUTE_UNUSED,
 {
     virDomainPtr dom = NULL;
     virTypedParameterPtr params = NULL;
-    int nparams = args->nparams;
+    int nparams = 0;
     unsigned int flags;
     int rv = -1;
     struct daemonClientPrivate *priv =
@@ -1926,14 +1929,15 @@ remoteDispatchDomainGetMemoryParameters(virNetServerPtr server ATTRIBUTE_UNUSED,
 
     flags = args->flags;
 
-    if (nparams > REMOTE_DOMAIN_MEMORY_PARAMETERS_MAX) {
+    if (args->nparams > REMOTE_DOMAIN_MEMORY_PARAMETERS_MAX) {
         virReportError(VIR_ERR_INTERNAL_ERROR, "%s", _("nparams too large"));
         goto cleanup;
     }
-    if (nparams && VIR_ALLOC_N(params, nparams) < 0) {
+    if (args->nparams && VIR_ALLOC_N(params, args->nparams) < 0) {
         virReportOOMError();
         goto cleanup;
     }
+    nparams = args->nparams;
 
     if (!(dom = get_nonnull_domain(priv->conn, args->dom)))
         goto cleanup;
@@ -1977,7 +1981,7 @@ remoteDispatchDomainGetNumaParameters(virNetServerPtr server ATTRIBUTE_UNUSED,
 {
     virDomainPtr dom = NULL;
     virTypedParameterPtr params = NULL;
-    int nparams = args->nparams;
+    int nparams = 0;
     unsigned int flags;
     int rv = -1;
     struct daemonClientPrivate *priv =
@@ -1990,14 +1994,15 @@ remoteDispatchDomainGetNumaParameters(virNetServerPtr server ATTRIBUTE_UNUSED,
 
     flags = args->flags;
 
-    if (nparams > REMOTE_DOMAIN_NUMA_PARAMETERS_MAX) {
+    if (args->nparams > REMOTE_DOMAIN_NUMA_PARAMETERS_MAX) {
         virReportError(VIR_ERR_INTERNAL_ERROR, "%s", _("nparams too large"));
         goto cleanup;
     }
-    if (nparams && VIR_ALLOC_N(params, nparams) < 0) {
+    if (args->nparams && VIR_ALLOC_N(params, args->nparams) < 0) {
         virReportOOMError();
         goto cleanup;
     }
+    nparams = args->nparams;
 
     if (!(dom = get_nonnull_domain(priv->conn, args->dom)))
         goto cleanup;
@@ -2041,7 +2046,7 @@ remoteDispatchDomainGetBlkioParameters(virNetServerPtr server ATTRIBUTE_UNUSED,
 {
     virDomainPtr dom = NULL;
     virTypedParameterPtr params = NULL;
-    int nparams = args->nparams;
+    int nparams = 0;
     unsigned int flags;
     int rv = -1;
     struct daemonClientPrivate *priv =
@@ -2054,14 +2059,15 @@ remoteDispatchDomainGetBlkioParameters(virNetServerPtr server ATTRIBUTE_UNUSED,
 
     flags = args->flags;
 
-    if (nparams > REMOTE_DOMAIN_BLKIO_PARAMETERS_MAX) {
+    if (args->nparams > REMOTE_DOMAIN_BLKIO_PARAMETERS_MAX) {
         virReportError(VIR_ERR_INTERNAL_ERROR, "%s", _("nparams too large"));
         goto cleanup;
     }
-    if (nparams && VIR_ALLOC_N(params, nparams) < 0) {
+    if (args->nparams && VIR_ALLOC_N(params, args->nparams) < 0) {
         virReportOOMError();
         goto cleanup;
     }
+    nparams = args->nparams;
 
     if (!(dom = get_nonnull_domain(priv->conn, args->dom)))
         goto cleanup;
@@ -2106,7 +2112,7 @@ remoteDispatchNodeGetCPUStats(virNetServerPtr server ATTRIBUTE_UNUSED,
     virNodeCPUStatsPtr params = NULL;
     int i;
     int cpuNum = args->cpuNum;
-    int nparams = args->nparams;
+    int nparams = 0;
     unsigned int flags;
     int rv = -1;
     struct daemonClientPrivate *priv =
@@ -2119,14 +2125,15 @@ remoteDispatchNodeGetCPUStats(virNetServerPtr server ATTRIBUTE_UNUSED,
 
     flags = args->flags;
 
-    if (nparams > REMOTE_NODE_CPU_STATS_MAX) {
+    if (args->nparams > REMOTE_NODE_CPU_STATS_MAX) {
         virReportError(VIR_ERR_INTERNAL_ERROR, "%s", _("nparams too large"));
         goto cleanup;
     }
-    if (VIR_ALLOC_N(params, nparams) < 0) {
+    if (args->nparams && VIR_ALLOC_N(params, args->nparams) < 0) {
         virReportOOMError();
         goto cleanup;
     }
+    nparams = args->nparams;
 
     if (virNodeGetCPUStats(priv->conn, cpuNum, params, &nparams, flags) < 0)
         goto cleanup;
@@ -2184,7 +2191,7 @@ remoteDispatchNodeGetMemoryStats(virNetServerPtr server ATTRIBUTE_UNUSED,
     virNodeMemoryStatsPtr params = NULL;
     int i;
     int cellNum = args->cellNum;
-    int nparams = args->nparams;
+    int nparams = 0;
     unsigned int flags;
     int rv = -1;
     struct daemonClientPrivate *priv =
@@ -2197,14 +2204,15 @@ remoteDispatchNodeGetMemoryStats(virNetServerPtr server ATTRIBUTE_UNUSED,
 
     flags = args->flags;
 
-    if (nparams > REMOTE_NODE_MEMORY_STATS_MAX) {
+    if (args->nparams > REMOTE_NODE_MEMORY_STATS_MAX) {
         virReportError(VIR_ERR_INTERNAL_ERROR, "%s", _("nparams too large"));
         goto cleanup;
     }
-    if (VIR_ALLOC_N(params, nparams) < 0) {
+    if (args->nparams && VIR_ALLOC_N(params, args->nparams) < 0) {
         virReportOOMError();
         goto cleanup;
     }
+    nparams = args->nparams;
 
     if (virNodeGetMemoryStats(priv->conn, cellNum, params, &nparams, flags) < 0)
         goto cleanup;
@@ -2303,7 +2311,7 @@ remoteDispatchDomainGetBlockIoTune(virNetServerPtr server ATTRIBUTE_UNUSED,
     virDomainPtr dom = NULL;
     int rv = -1;
     virTypedParameterPtr params = NULL;
-    int nparams = args->nparams;
+    int nparams = 0;
     struct daemonClientPrivate *priv =
         virNetServerClientGetPrivateData(client);
 
@@ -2312,15 +2320,16 @@ remoteDispatchDomainGetBlockIoTune(virNetServerPtr server ATTRIBUTE_UNUSED,
         goto cleanup;
     }
 
-    if (nparams > REMOTE_DOMAIN_BLOCK_IO_TUNE_PARAMETERS_MAX) {
+    if (args->nparams > REMOTE_DOMAIN_BLOCK_IO_TUNE_PARAMETERS_MAX) {
         virReportError(VIR_ERR_INTERNAL_ERROR, "%s", _("nparams too large"));
         goto cleanup;
     }
 
-    if (nparams && VIR_ALLOC_N(params, nparams) < 0) {
+    if (args->nparams && VIR_ALLOC_N(params, args->nparams) < 0) {
         virReportOOMError();
         goto cleanup;
     }
+    nparams = args->nparams;
 
     if (!(dom = get_nonnull_domain(priv->conn, args->dom)))
         goto cleanup;
@@ -3800,7 +3809,7 @@ remoteDispatchDomainGetInterfaceParameters(virNetServerPtr server ATTRIBUTE_UNUS
     virDomainPtr dom = NULL;
     virTypedParameterPtr params = NULL;
     const char *device = args->device;
-    int nparams = args->nparams;
+    int nparams = 0;
     unsigned int flags;
     int rv = -1;
     struct daemonClientPrivate *priv =
@@ -3813,14 +3822,15 @@ remoteDispatchDomainGetInterfaceParameters(virNetServerPtr server ATTRIBUTE_UNUS
 
     flags = args->flags;
 
-    if (nparams > REMOTE_DOMAIN_INTERFACE_PARAMETERS_MAX) {
+    if (args->nparams > REMOTE_DOMAIN_INTERFACE_PARAMETERS_MAX) {
         virReportError(VIR_ERR_INTERNAL_ERROR, "%s", _("nparams too large"));
         goto cleanup;
     }
-    if (nparams && VIR_ALLOC_N(params, nparams) < 0) {
+    if (args->nparams && VIR_ALLOC_N(params, args->nparams) < 0) {
         virReportOOMError();
         goto cleanup;
     }
+    nparams = args->nparams;
 
     if (!(dom = get_nonnull_domain(priv->conn, args->dom)))
         goto cleanup;
@@ -4508,7 +4518,7 @@ remoteDispatchNodeGetMemoryParameters(virNetServerPtr server ATTRIBUTE_UNUSED,
                                       remote_node_get_memory_parameters_ret *ret)
 {
     virTypedParameterPtr params = NULL;
-    int nparams = args->nparams;
+    int nparams = 0;
     unsigned int flags;
     int rv = -1;
     struct daemonClientPrivate *priv =
@@ -4521,15 +4531,15 @@ remoteDispatchNodeGetMemoryParameters(virNetServerPtr server ATTRIBUTE_UNUSED,
 
     flags = args->flags;
 
-    if (nparams > REMOTE_NODE_MEMORY_PARAMETERS_MAX) {
+    if (args->nparams > REMOTE_NODE_MEMORY_PARAMETERS_MAX) {
         virReportError(VIR_ERR_INTERNAL_ERROR, "%s", _("nparams too large"));
         goto cleanup;
     }
-    if (nparams && VIR_ALLOC_N(params, nparams) < 0) {
+    if (args->nparams && VIR_ALLOC_N(params, args->nparams) < 0) {
         virReportOOMError();
         goto cleanup;
     }
-
+    nparams = args->nparams;
 
     if (virNodeGetMemoryParameters(priv->conn, params, &nparams, flags) < 0)
         goto cleanup;
-- 
1.8.2.1


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