>From 94923b161a9d066146271bb533b78ab7877e4501 Mon Sep 17 00:00:00 2001
From: Jim Meyering <meyering@xxxxxxxxxx>
Date: Mon, 14 Dec 2009 17:17:53 +0100
Subject: [PATCH] libvirt.c: don't let a NULL "cpumaps" argument provoke a NULL-deref
* src/libvirt.c (virDomainGetVcpus): Update spec to say that maplen
is ignored when "cpumaps" is NULL.
Set maplen to 0 in that case.
---
src/libvirt.c | 7 +++++++
1 files changed, 7 insertions(+), 0 deletions(-)
diff --git a/src/libvirt.c b/src/libvirt.c
index 008e322..4325aa4 100644
--- a/src/libvirt.c
+++ b/src/libvirt.c
@@ -4753,6 +4753,7 @@ error:
* virDomainPinVcpu() API.
* @maplen: number of bytes in one cpumap, from 1 up to size of CPU map in
* underlying virtualization system (Xen...).
+ * Ignored when cpumaps is NULL.
*
* Extract information about virtual CPUs of domain, store it in info array
* and also in cpumaps if this pointer isn't NULL.
@@ -4776,6 +4777,12 @@ virDomainGetVcpus(virDomainPtr domain, virVcpuInfoPtr info, int maxinfo,
virLibDomainError(domain, VIR_ERR_INVALID_ARG, __FUNCTION__);
goto error;
}
+
+ /* Ensure that domainGetVcpus (aka remoteDomainGetVcpus) does not
+ try to memcpy anything into a NULL pointer. */
+ if (cpumaps == NULL)
+ maplen = 0;
+
if (cpumaps != NULL && maplen < 1) {
virLibDomainError(domain, VIR_ERR_INVALID_ARG, __FUNCTION__);
goto error;
--
1.6.6.rc2.275.g51e2d
--
Libvir-list mailing list
Libvir-list@xxxxxxxxxx
https://www.redhat.com/mailman/listinfo/libvir-list