[libvirt] [PATCH 2/2] vcpupin: Fix returning of arrays from virDomainVcpuPinAdd

[Peter Krempa]

virDomainVcpuPinAdd does a realloc on vcpupin_list if the new vcpu pin
definition doesn't fit into the array. The list is an array of pointers
but the function definition didn't support returning the changed pointer
to the caller if it was realloced. This caused segfaults if realloc
would change the base pointer.
---
 src/conf/domain_conf.c   | 8 ++++----
 src/conf/domain_conf.h   | 2 +-
 src/libxl/libxl_driver.c | 2 +-
 src/qemu/qemu_driver.c   | 6 +++---
 src/xen/xend_internal.c  | 2 +-
 5 files changed, 10 insertions(+), 10 deletions(-)

diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index 2dad64d..554298d 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -11037,7 +11037,7 @@ cleanup:
     return bitmap;
 }

-int virDomainVcpuPinAdd(virDomainVcpuPinDefPtr *vcpupin_list,
+int virDomainVcpuPinAdd(virDomainVcpuPinDefPtr **vcpupin_list,
                         int *nvcpupin,
                         unsigned char *cpumap,
                         int maplen,
@@ -11052,7 +11052,7 @@ int virDomainVcpuPinAdd(virDomainVcpuPinDefPtr *vcpupin_list,
     if ((cpumask = bitmapFromBytemap(cpumap, maplen)) == NULL)
         return -1;

-    vcpupin = virDomainVcpuPinFindByVcpu(vcpupin_list,
+    vcpupin = virDomainVcpuPinFindByVcpu(*vcpupin_list,
                                          *nvcpupin,
                                          vcpu);
     if (vcpupin) {
@@ -11073,14 +11073,14 @@ int virDomainVcpuPinAdd(virDomainVcpuPinDefPtr *vcpupin_list,
     vcpupin->cpumask = cpumask;


-    if (VIR_REALLOC_N(vcpupin_list, *nvcpupin + 1) < 0) {
+    if (VIR_REALLOC_N(*vcpupin_list, *nvcpupin + 1) < 0) {
         virReportOOMError();
         VIR_FREE(cpumask);
         VIR_FREE(vcpupin);
         return -1;
     }

-    vcpupin_list[(*nvcpupin)++] = vcpupin;
+    (*vcpupin_list)[(*nvcpupin)++] = vcpupin;

     return 0;
 }
diff --git a/src/conf/domain_conf.h b/src/conf/domain_conf.h
index 9ee57e1..dfdae49 100644
--- a/src/conf/domain_conf.h
+++ b/src/conf/domain_conf.h
@@ -1885,7 +1885,7 @@ int virDomainCpuSetParse(const char *str,
 char *virDomainCpuSetFormat(char *cpuset,
                             int maxcpu);

-int virDomainVcpuPinAdd(virDomainVcpuPinDefPtr *vcpupin_list,
+int virDomainVcpuPinAdd(virDomainVcpuPinDefPtr **vcpupin_list,
                         int *nvcpupin,
                         unsigned char *cpumap,
                         int maplen,
diff --git a/src/libxl/libxl_driver.c b/src/libxl/libxl_driver.c
index d8ecf13..1638314 100644
--- a/src/libxl/libxl_driver.c
+++ b/src/libxl/libxl_driver.c
@@ -2461,7 +2461,7 @@ libxlDomainPinVcpu(virDomainPtr dom, unsigned int vcpu, unsigned char *cpumap,
         }
         vm->def->cputune.nvcpupin = 0;
     }
-    if (virDomainVcpuPinAdd(vm->def->cputune.vcpupin,
+    if (virDomainVcpuPinAdd(&vm->def->cputune.vcpupin,
                             &vm->def->cputune.nvcpupin,
                             cpumap,
                             maplen,
diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index 7c0a5c3..5670ca0 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -3782,7 +3782,7 @@ qemudDomainPinVcpuFlags(virDomainPtr dom,
             newVcpuPinNum = 0;
         }

-        if (virDomainVcpuPinAdd(newVcpuPin, &newVcpuPinNum, cpumap, maplen, vcpu) < 0) {
+        if (virDomainVcpuPinAdd(&newVcpuPin, &newVcpuPinNum, cpumap, maplen, vcpu) < 0) {
             virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
                            _("failed to update vcpupin"));
             virDomainVcpuPinDefFree(newVcpuPin, newVcpuPinNum);
@@ -3849,7 +3849,7 @@ qemudDomainPinVcpuFlags(virDomainPtr dom,
                 }
                 persistentDef->cputune.nvcpupin = 0;
             }
-            if (virDomainVcpuPinAdd(persistentDef->cputune.vcpupin,
+            if (virDomainVcpuPinAdd(&persistentDef->cputune.vcpupin,
                                     &persistentDef->cputune.nvcpupin,
                                     cpumap,
                                     maplen,
@@ -4042,7 +4042,7 @@ qemudDomainPinEmulator(virDomainPtr dom,
                 newVcpuPinNum = 0;
             }

-            if (virDomainVcpuPinAdd(newVcpuPin, &newVcpuPinNum, cpumap, maplen, -1) < 0) {
+            if (virDomainVcpuPinAdd(&newVcpuPin, &newVcpuPinNum, cpumap, maplen, -1) < 0) {
                 virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
                                _("failed to update vcpupin"));
                 virDomainVcpuPinDefFree(newVcpuPin, newVcpuPinNum);
diff --git a/src/xen/xend_internal.c b/src/xen/xend_internal.c
index 99def42..984f040 100644
--- a/src/xen/xend_internal.c
+++ b/src/xen/xend_internal.c
@@ -2303,7 +2303,7 @@ xenDaemonDomainPinVcpu(virDomainPtr domain, unsigned int vcpu,
             }
             def->cputune.nvcpupin = 0;
         }
-        if (virDomainVcpuPinAdd(def->cputune.vcpupin,
+        if (virDomainVcpuPinAdd(&def->cputune.vcpupin,
                                 &def->cputune.nvcpupin,
                                 cpumap,
                                 maplen,
-- 
1.7.12