This function used the same char* three times for different purposes, freeing it after each use. Since we don't want to ever manually free an autofree'd pointer, modify it to use three separate char*, and make them all g_autofree. Signed-off-by: Laine Stump <laine(a)redhat.com&gt; --- This was suggested by Jan in https://www.redhat.com/archives/libvir-list/2020-July/msg00805.html pushing this patch along with the patch 5 referenced there will permit pushing patch 06/15 of that series unmodified. src/network/bridge_driver.c | 32 ++++++++++++++++---------------- 1 file changed, 16 insertions(+), 16 deletions(-) diff --git a/src/network/bridge_driver.c b/src/network/bridge_driver.c index dd8f34e543..6d341dba7c 100644 --- a/src/network/bridge_driver.c +++ b/src/network/bridge_driver.c @@ -2248,7 +2248,9 @@ static int networkSetIPv6Sysctls(virNetworkObjPtr obj) { virNetworkDefPtr def = virNetworkObjGetDef(obj); - char *field = NULL; + g_autofree char *disable_ipv6 = NULL; + g_autofree char *accept_ra = NULL; + g_autofree char *autoconf = NULL; int ret = -1; bool enableIPv6 = !!virNetworkDefGetIPByIndex(def, AF_INET6, 0); @@ -2256,10 +2258,10 @@ networkSetIPv6Sysctls(virNetworkObjPtr obj) * network. But also unset it if there *are* ipv6 addresses, as we * can't be sure of its default value. */ - field = g_strdup_printf(SYSCTL_PATH "/net/ipv6/conf/%s/disable_ipv6", - def->bridge); + disable_ipv6 = g_strdup_printf(SYSCTL_PATH "/net/ipv6/conf/%s/disable_ipv6", + def->bridge); - if (access(field, W_OK) < 0 && errno == ENOENT) { + if (access(disable_ipv6, W_OK) < 0 && errno == ENOENT) { if (!enableIPv6) VIR_DEBUG("ipv6 appears to already be disabled on %s", def->bridge); @@ -2267,13 +2269,12 @@ networkSetIPv6Sysctls(virNetworkObjPtr obj) goto cleanup; } - if (virFileWriteStr(field, enableIPv6 ? "0" : "1", 0) < 0) { + if (virFileWriteStr(disable_ipv6, enableIPv6 ? "0" : "1", 0) < 0) { virReportSystemError(errno, _("cannot write to %s to enable/disable IPv6 " - "on bridge %s"), field, def->bridge); + "on bridge %s"), disable_ipv6, def->bridge); goto cleanup; } - VIR_FREE(field); /* The rest of the ipv6 sysctl tunables should always be set the * same, whether or not we're using ipv6 on this bridge. @@ -2282,30 +2283,29 @@ networkSetIPv6Sysctls(virNetworkObjPtr obj) /* Prevent guests from hijacking the host network by sending out * their own router advertisements. */ - field = g_strdup_printf(SYSCTL_PATH "/net/ipv6/conf/%s/accept_ra", - def->bridge); + accept_ra = g_strdup_printf(SYSCTL_PATH "/net/ipv6/conf/%s/accept_ra", + def->bridge); - if (virFileWriteStr(field, "0", 0) < 0) { + if (virFileWriteStr(accept_ra, "0", 0) < 0) { virReportSystemError(errno, - _("cannot disable %s"), field); + _("cannot disable %s"), accept_ra); goto cleanup; } - VIR_FREE(field); /* All interfaces used as a gateway (which is what this is, by * definition), must always have autoconf=0. */ - field = g_strdup_printf(SYSCTL_PATH "/net/ipv6/conf/%s/autoconf", def->bridge); + autoconf = g_strdup_printf(SYSCTL_PATH "/net/ipv6/conf/%s/autoconf", + def->bridge); - if (virFileWriteStr(field, "0", 0) < 0) { + if (virFileWriteStr(autoconf, "0", 0) < 0) { virReportSystemError(errno, - _("cannot disable %s"), field); + _("cannot disable %s"), autoconf); goto cleanup; } ret = 0; cleanup: - VIR_FREE(field); return ret; } -- 2.25.4