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libvirt.c: don't let a NULL "cpumaps" argument provoke a NULL-deref

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* src/libvirt.c (virDomainGetVcpus): Describe new, stronger
requirement on "maplen"s relationship to "cpumaps".
This commit is contained in:
Jim Meyering 2009-12-14 17:17:53 +01:00
parent 643ee3fa44
commit d37bca86d0
1 changed files with 6 additions and 1 deletions
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7
src/libvirt.c
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@ -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...).
* Must be zero when cpumaps is NULL and positive when it is non-NULL.
*
* Extract information about virtual CPUs of domain, store it in info array
* and also in cpumaps if this pointer isn't NULL.
@ -4776,7 +4777,11 @@ virDomainGetVcpus(virDomainPtr domain, virVcpuInfoPtr info, int maxinfo,
virLibDomainError(domain, VIR_ERR_INVALID_ARG, __FUNCTION__);
goto error;
}
if (cpumaps != NULL && maplen < 1) {
/* Ensure that domainGetVcpus (aka remoteDomainGetVcpus) does not
try to memcpy anything into a NULL pointer. */
if ((cpumaps == NULL && maplen != 0)
|| (cpumaps && maplen <= 0)) {
virLibDomainError(domain, VIR_ERR_INVALID_ARG, __FUNCTION__);
goto error;
}