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90 lines
2.7 KiB
90 lines
2.7 KiB
From bfa850db67e150e8d44093a14ef6a9999c5c9968 Mon Sep 17 00:00:00 2001
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From: Oliver Kurth <okurth@vmware.com>
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Date: Wed, 29 Aug 2018 13:29:43 -0700
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Subject: [PATCH] Fix some bad derefs in primary NIC gathering code.
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Found by user in https://github.com/vmware/open-vm-tools/issues/272
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Debug code tries to access a struct field that may not have been initialized.
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- Pointer deref'd without a sanity check.
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---
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open-vm-tools/lib/nicInfo/nicInfoPosix.c | 39 +++++++++++++++++++++-----------
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1 file changed, 26 insertions(+), 13 deletions(-)
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diff --git a/lib/nicInfo/nicInfoPosix.c b/lib/nicInfo/nicInfoPosix.c
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index 8a063a0..31c1d1a 100644
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--- a/lib/nicInfo/nicInfoPosix.c
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+++ b/lib/nicInfo/nicInfoPosix.c
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@@ -359,7 +359,7 @@ GuestInfoGetNicInfo(unsigned int maxIPv4Routes,
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/* Get a handle to read the network interface configuration details. */
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if ((intf = intf_open()) == NULL) {
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- g_debug("Error, failed NULL result from intf_open()\n");
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+ g_warning("%s: intf_open() failed\n", __FUNCTION__);
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return FALSE;
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}
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@@ -466,7 +466,15 @@ GuestInfoGetPrimaryIP(void)
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* the first non-loopback, internet interface in the interface list.
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*/
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for (curr = ifaces; curr != NULL; curr = curr->ifa_next) {
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- int currFamily = ((struct sockaddr_storage *)curr->ifa_addr)->ss_family;
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+ int currFamily;
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+
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+ /*
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+ * Some interfaces ("tun") have no ifa_addr, so ignore them.
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+ */
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+ if (NULL == curr->ifa_addr) {
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+ continue;
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+ }
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+ currFamily = ((struct sockaddr_storage *)curr->ifa_addr)->ss_family;
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if (!(curr->ifa_flags & IFF_UP) || curr->ifa_flags & IFF_LOOPBACK) {
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continue;
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@@ -500,6 +508,7 @@ GuestInfoGetPrimaryIP(void)
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}
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#else
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+
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#ifndef NO_DNET
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char *
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@@ -508,20 +517,24 @@ GuestInfoGetPrimaryIP(void)
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GuestInfoIpPriority ipp;
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intf_t *intf = intf_open();
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- if (intf != NULL) {
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- ipp.ipstr = NULL;
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- for (ipp.priority = NICINFO_PRIORITY_PRIMARY;
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- ipp.priority < NICINFO_PRIORITY_MAX;
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- ipp.priority++){
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- intf_loop(intf, GuestInfoGetIntf, &ipp);
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- if (ipp.ipstr != NULL) {
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- break;
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- }
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+ if (NULL == intf) {
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+ g_warning("%s: intf_open() failed\n", __FUNCTION__);
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+ return NULL;
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+ }
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+
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+ ipp.ipstr = NULL;
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+ for (ipp.priority = NICINFO_PRIORITY_PRIMARY;
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+ ipp.priority < NICINFO_PRIORITY_MAX;
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+ ipp.priority++){
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+ intf_loop(intf, GuestInfoGetIntf, &ipp);
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+ if (ipp.ipstr != NULL) {
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+ break;
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}
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- intf_close(intf);
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}
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+ intf_close(intf);
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- g_debug("%s: returning '%s'", __FUNCTION__, ipp.ipstr);
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+ g_debug("%s: returning '%s'",
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+ __FUNCTION__, ipp.ipstr ? ipp.ipstr : "<null>");
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return ipp.ipstr;
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}
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--
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2.7.4
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