[libvirt] [PATCH 5/7] qemudDomainAttachSCSIDisk: avoid FP NULL-ptr-deref from clang

[Jim Meyering <jim@xxxxxxxxxxxx>]

From: Jim Meyering <meyering@xxxxxxxxxx>

* src/qemu/qemu_driver.c (qemudDomainAttachSCSIDisk):
Initialize "cont" to NULL, so clang knows it's set.
Add an sa_assert so it knows it's non-NULL when dereferenced.
---
 src/qemu/qemu_driver.c |    7 ++++++-
 1 files changed, 6 insertions(+), 1 deletions(-)

diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index df1d435..f5cf1f1 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -6851,7 +6851,7 @@ static int qemudDomainAttachSCSIDisk(struct qemud_driver *driver,
 {
     int i;
     qemuDomainObjPrivatePtr priv = vm->privateData;
-    virDomainControllerDefPtr cont;
+    virDomainControllerDefPtr cont = NULL;
     char *drivestr = NULL;
     char *devstr = NULL;
     int ret = -1;
@@ -6894,6 +6894,11 @@ static int qemudDomainAttachSCSIDisk(struct qemud_driver *driver,
             goto error;
     }

+    /* Tell clang that "cont" is non-NULL.
+       This is because disk->info.addr.driver.controller is unsigned,
+       and hence the above loop must iterate at least once.  */
+    sa_assert (cont);
+
     if (cont->info.type != VIR_DOMAIN_DEVICE_ADDRESS_TYPE_PCI) {
         qemuReportError(VIR_ERR_INTERNAL_ERROR,
                         _("SCSI controller %d was missing its PCI address"), cont->idx);
-- 
1.7.1.rc1.248.gcefbb

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