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qemuBuildMemoryBackendStr: Don't crash if no hugetlbfs is mounted

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When trying to migrate a huge page enabled guest, I've noticed
the following crash. Apparently, if no specific hugepages are
requested:

  <memoryBacking>
    <hugepages/>
  </memoryBacking>

and there are no hugepages configured on the destination, we try
to dereference a NULL pointer.

Program received signal SIGSEGV, Segmentation fault.
0x00007fcc907fb20e in qemuGetHugepagePath (hugepage=0x0) at qemu/qemu_conf.c:1447
1447        if (virAsprintf(&ret, "%s/libvirt/qemu", hugepage->mnt_dir) < 0)
(gdb) bt
#0  0x00007fcc907fb20e in qemuGetHugepagePath (hugepage=0x0) at qemu/qemu_conf.c:1447
#1  0x00007fcc907fb2f5 in qemuGetDefaultHugepath (hugetlbfs=0x0, nhugetlbfs=0) at qemu/qemu_conf.c:1466
#2  0x00007fcc907b4afa in qemuBuildMemoryBackendStr (size=4194304, pagesize=0, guestNode=0, userNodeset=0x0, autoNodeset=0x0, def=0x7fcc70019070, qemuCaps=0x7fcc70004000, cfg=0x7fcc5c011800, backendType=0x7fcc95087228, backendProps=0x7fcc95087218,
    force=false) at qemu/qemu_command.c:3297
#3  0x00007fcc907b4f91 in qemuBuildMemoryCellBackendStr (def=0x7fcc70019070, qemuCaps=0x7fcc70004000, cfg=0x7fcc5c011800, cell=0, auto_nodeset=0x0, backendStr=0x7fcc70020360) at qemu/qemu_command.c:3413
#4  0x00007fcc907c0406 in qemuBuildNumaArgStr (cfg=0x7fcc5c011800, def=0x7fcc70019070, cmd=0x7fcc700040c0, qemuCaps=0x7fcc70004000, auto_nodeset=0x0) at qemu/qemu_command.c:7470
#5  0x00007fcc907c5fdf in qemuBuildCommandLine (driver=0x7fcc5c07b8a0, logManager=0x7fcc70003c00, def=0x7fcc70019070, monitor_chr=0x7fcc70004bb0, monitor_json=true, qemuCaps=0x7fcc70004000, migrateURI=0x7fcc700199c0 "defer", snapshot=0x0,
    vmop=VIR_NETDEV_VPORT_PROFILE_OP_MIGRATE_IN_START, standalone=false, enableFips=false, nodeset=0x0, nnicindexes=0x7fcc95087498, nicindexes=0x7fcc950874a0, domainLibDir=0x7fcc700047c0 "/var/lib/libvirt/qemu/domain-1-fedora") at qemu/qemu_command.c:9547

Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
(cherry picked from commit 647db05e9a)
This commit is contained in:
Michal Privoznik 2016-09-17 09:29:11 +02:00 committed by Cole Robinson
parent dfdacfe264
commit 91f826810d
2 changed files with 16 additions and 0 deletions
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6
src/qemu/qemu_command.c
View File

@ -3198,6 +3198,12 @@ qemuBuildMemoryBackendStr(unsigned long long size,
if (!(mem_path = qemuGetHugepagePath(&cfg->hugetlbfs[i])))
goto cleanup;
} else {
if (!cfg->nhugetlbfs) {
virReportError(VIR_ERR_INTERNAL_ERROR,
"%s", _("hugetlbfs filesystem is not mounted "
"or disabled by administrator config"));
goto cleanup;
}
if (!(mem_path = qemuGetDefaultHugepath(cfg->hugetlbfs,
cfg->nhugetlbfs)))
goto cleanup;

10
src/qemu/qemu_conf.c
View File

@ -1382,6 +1382,16 @@ qemuGetHugepagePath(virHugeTLBFSPtr hugepage)
return ret;
}
/**
* qemuGetDefaultHugepath:
* @hugetlbfs: array of configured hugepages
* @nhugetlbfs: number of item in the array
*
* Callers must ensure that @hugetlbfs contains at least one entry.
*
* Returns 0 on success, -1 otherwise.
* */
char *
qemuGetDefaultHugepath(virHugeTLBFSPtr hugetlbfs,
size_t nhugetlbfs)