Re: [libvirt] [PATCH v3 python 2/2] don't overrun buffer when converting cpumap

If we pass large(more than cpunum) cpu mask to any libvirt_virDomainPin* function, it could leads to crash. So we have to check tuple size in virPyCpumapConvert and ignore extra tuple members. Signed-off-by: Konstantin Neumoin <kneumoin(a)virtuozzo.com&gt; --- libvirt-utils.c | 13 +++++++++---- 1 file changed, 9 insertions(+), 4 deletions(-) diff --git a/libvirt-utils.c b/libvirt-utils.c index 09cc1c3..ac3606b 100644 --- a/libvirt-utils.c +++ b/libvirt-utils.c @@ -623,7 +623,15 @@ virPyCpumapConvert(int cpunum, return -1; } - for (i = 0; i < tuple_size; i++) { + /* Not presented elements of the tuple will be filled by zeros. + * Only first "cpunum" elements make sense, so the rest + * of the bits from the tuple will be ignored. */ + for (i = 0; i < cpunum; i++) { + if (i >= tuple_size) { + VIR_UNUSE_CPU(*cpumapptr, i);