Re: [libvirt] [PATCH] xenFormatXLDomainDisks: avoid double free on OOM testing

From: Wim ten Have <wim.ten.have(a)oracle.com&gt; Fix xlconfigtest runs build for --enable-test-oom on Xen XL-2-XML Parse new-disk #0 0x00007ffff3bd791f in raise () from /lib64/libc.so.6 #1 0x00007ffff3bd951a in abort () from /lib64/libc.so.6 #2 0x00007ffff3c1b200 in __libc_message () from /lib64/libc.so.6 #3 0x00007ffff3c2488a in _int_free () from /lib64/libc.so.6 #4 0x00007ffff3c282bc in free () from /lib64/libc.so.6 #5 0x00007ffff7864fcb in virFree (ptrptr=ptrptr@entry=0x7fffffffd868) at util/viralloc.c:582 #6 0x00007ffff78776e5 in virConfFreeValue (val=<optimized out>) at util/virconf.c:178 ==> #7 0x0000000000425759 in xenFormatXLDomainDisks (def=0x7fffffffd8c0, def=0x7fffffffd8c0, conf=0x658220) at xenconfig/xen_xl.c:1159 #8 xenFormatXL (def=def@entry=0x66ec20, conn=conn@entry=0x668cf0) at xenconfig/xen_xl.c:1558 #9 0x000000000040ea1d in testCompareParseXML (replaceVars=<optimized out>, xml=0x65f5e0 "/home/wtenhave/WORK/libvirt/history/libvirt/tests/xlconfigdata/test-fullvirt-ovmf.xml", xlcfg=0x65f6b0 "/home/wtenhave/WORK/libvirt/history/libvirt/tests/xlconfigdata/test-fullvirt-ovmf.cfg") at xlconfigtest.c:105 #10 testCompareHelper (data=<optimized out>) at xlconfigtest.c:205 #11 0x000000000041079a in virTestRun (title=title@entry=0x431cf0 "Xen XL-2-XML Parse fullvirt-ovmf", body=body@entry=0x40e720 <testCompareHelper>, data=data@entry=0x7fffffffda50) at testutils.c:247 #12 0x000000000040ebc2 in mymain () at xlconfigtest.c:256 #13 0x0000000000411070 in virTestMain (argc=1, argv=0x7fffffffdc08, func=0x40f2c0 <mymain>) at testutils.c:992 #14 0x00007ffff3bc2401 in __libc_start_main () from /lib64/libc.so.6 #15 0x000000000040e5da in _start () symmetry seems missing its sibbling coded functionality demonstrated under functions; xenFormatXLUSBController() xenFormatXLUSB() xenFormatXLDomainChannels() xenFormatXMDisks

Signed-off-by: Wim ten Have <wim.ten.have(a)oracle.com&gt; --- src/xenconfig/xen_xl.c | 15 +++++++++------ 1 file changed, 9 insertions(+), 6 deletions(-) diff --git a/src/xenconfig/xen_xl.c b/src/xenconfig/xen_xl.c index 74f68b3..43ecf41 100644 --- a/src/xenconfig/xen_xl.c +++ b/src/xenconfig/xen_xl.c @@ -1132,7 +1132,6 @@ xenFormatXLDisk(virConfValuePtr list, virDomainDiskDefPtr disk) static int xenFormatXLDomainDisks(virConfPtr conf, virDomainDefPtr def) { - int ret = -1; virConfValuePtr diskVal; size_t i; @@ -1150,15 +1149,19 @@ xenFormatXLDomainDisks(virConfPtr conf, virDomainDefPtr def) goto cleanup; } - if (diskVal->list != NULL) - if (virConfSetValue(conf, "disk", diskVal) == 0) - diskVal = NULL; + if (diskVal->list != NULL) { + int ret = virConfSetValue(conf, "disk", diskVal); + diskVal = NULL; + if (ret < 0) + return -1; + } + VIR_FREE(diskVal); - ret = 0; + return 0; cleanup: virConfFreeValue(diskVal); - return ret; + return -1; }