On 07/05/2018 06:34 AM, Luyao Huang wrote: > If the code jump to the cleanup before assagin value to xml pointer, > libvirtd may get crashed when try to free an uninitialized pointer. > > backtrace: > > 0 0x00007ffff428d59c in free () from /lib64/libc.so.6 > 1 0x00007ffff721314a in virFree (ptrptr=ptrptr@entry=0x7fffc67f1b00) at util/viralloc.c:582 > 2 0x00007ffff7345ac4 in virDomainConfNWFilterInstantiate (vmname=<optimized out>, > vmuuid=vmuuid@entry=0x7fffc0181ca8 "߉\237\\۔H\262\206z\340\302f\265\233z", net=<optimized out>, > ignoreExists=ignoreExists@entry=true) at conf/domain_nwfilter.c:122 > 3 0x00007fffca5a77f6 in qemuProcessFiltersInstantiate (ignoreExists=true, def=0x7fffc0181ca0) at qemu/qemu_process.c:3028 > 4 qemuProcessReconnect (opaque=<optimized out>) at qemu/qemu_process.c:7653 > 5 0x00007ffff72c4895 in virThreadHelper (data=<optimized out>) at util/virthread.c:206 > 6 0x00007ffff45dcdd5 in start_thread () from /lib64/libpthread.so.0 > 7 0x00007ffff4305ead in clone () from /lib64/libc.so.6 > > Signed-off-by: Luyao Huang <lhuang@xxxxxxxxxx> > --- > src/conf/domain_nwfilter.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/src/conf/domain_nwfilter.c b/src/conf/domain_nwfilter.c > index 948b324..24b5f42 100644 > --- a/src/conf/domain_nwfilter.c > +++ b/src/conf/domain_nwfilter.c > @@ -90,7 +90,7 @@ virDomainConfNWFilterInstantiate(const char *vmname, > virConnectPtr conn = virGetConnectNWFilter(); > virNWFilterBindingDefPtr def = NULL; > virNWFilterBindingPtr binding = NULL; > - char *xml; > + char *xml = NULL; > int ret = -1; > > VIR_DEBUG("vmname=%s portdev=%s filter=%s ignoreExists=%d", > Slightly reworked the commit message, ACKed and pushed. Michal -- libvir-list mailing list libvir-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/libvir-list