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Re: [libvirt] [PATCH 1/1] Fix the crash when seclable is freed



On 2013年04月02日 14:47, Osier Yang wrote:
On 02/04/13 13:58, Li Zhang wrote:
From: Li Zhang <zhlcindy linux vnet ibm com>

When seclabel's type is VIR_DOMAIN_SECLABEL_NONE,
virSecurityLabelDefPtr's members are not allocated.
So it will cause crash when calling VIR_FREE.

This problem is found when running autotest on PPC.

Failed to remove cgroup for virt-tests-vm1
*** glibc detected *** /usr/sbin/libvirtd: free(): invalid pointer: 0x00003fff9c187510 ***
======= Backtrace: =========
/lib64/libc.so.6(+0xb89c4)[0x3fffa9bc89c4]
/lib64/libvirt.so.0(virFree-0x3e2320)[0x3fffaa82e9c0]
/lib64/libvirt.so.0(virSecurityLabelDefFree-0x378984)[0x3fffaa89d69c]
/lib64/libvirt.so.0(virDomainDefFree-0x367c98)[0x3fffaa8ae968]
/usr/lib64/libvirt/connection-driver/libvirt_driver_qemu.so(qemuProcessStop-0xc85f8)[0x3fffa2899d58]
/usr/lib64/libvirt/connection-driver/libvirt_driver_qemu.so(+0xc3668)[0x3fffa28e3668]
/lib64/libvirt.so.0(virDomainDestroy-0x309bd0)[0x3fffaa90f6f0]
/usr/sbin/libvirtd[0x10035230]
/lib64/libvirt.so.0(virNetServerProgramDispatch-0x289b50)[0x3fffaa995930]
/lib64/libvirt.so.0(+0x20db18)[0x3fffaa98db18]
/lib64/libvirt.so.0(+0xfbd24)[0x3fffaa87bd24]
/lib64/libvirt.so.0(+0xfaec8)[0x3fffaa87aec8]
/lib64/libpthread.so.0(+0xc604)[0x3fffa9d7c604]
/lib64/libc.so.6(clone-0xb8fe4)[0x3fffa9c3f094]

Signed-off-by: Li Zhang <zhlcindy linux vnet ibm com>
---
src/conf/domain_conf.c | 2 ++
1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index f3fca7f..2856660 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -1006,6 +1006,8 @@ virSecurityLabelDefFree(virSecurityLabelDefPtr def)
{
if (!def)
return;
+ if (def->type == VIR_DOMAIN_SECLABEL_NONE)
+ return;
VIR_FREE(def->model);

model is always parsed. So it will be leaked if someone specifies
"model" even the type is "none".
Okay, it seems that is not always non-NULL although it is always parsed.

My XML file is as:
<seclabel type='none'/>

It should be better to add if clause before VIR_FREE.


VIR_FREE(def->label);
VIR_FREE(def->imagelabel);



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