From d39f6ba78035adbe3772603a1939af1e67464448 Mon Sep 17 00:00:00 2001 Message-Id: From: Luyao Huang Date: Wed, 11 Jul 2018 17:29:48 +0200 Subject: [PATCH] virDomainConfNWFilterInstantiate: initialize @xml to avoid random crash MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit https://bugzilla.redhat.com/show_bug.cgi?id=1599545 If the code jump to the cleanup before assigning value to @xml libvirtd may crash when it tries 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=, vmuuid=vmuuid@entry=0x7fffc0181ca8 "߉\237\\۔H\262\206z\340\302f\265\233z", net=, 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=) at qemu/qemu_process.c:7653 5 0x00007ffff72c4895 in virThreadHelper (data=) 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 (cherry picked from commit d7557f5f6f51264c1b5623e97f7b4d5259d4d3b6) Signed-off-by: Michal Privoznik Reviewed-by: Ján Tomko --- 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 948b32481e..24b5f42ddd 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", -- 2.18.0