[PATCH] lxc: don't try to resolve a NULL path for filesystems

["Daniel P. Berrange" <berrange@xxxxxxxxxx>]

  <filesystem type='ram' accessmode='passthrough'>
    <source usage='524288' units='KiB'/>
    <target dir='/dev/shm'/>
  </filesystem>

would lead to lxcContainerResolveSymlinks calling
access(NULL) because it failed to check if fs->src->path
was non-NULL. This is a regression caused by

  commit da665fbd4858890fbb3bbf5da2a7b6ca37bb3220
  Author: Olga Krishtal <okrishtal@xxxxxxxxxxxxx>
  Date:   Thu Jul 14 16:52:38 2016 +0300

    filesystem: adds possibility to use storage pool as fs source

    Signed-off-by: Olga Krishtal <okrishtal@xxxxxxxxxxxxx>

Signed-off-by: Daniel P. Berrange <berrange@xxxxxxxxxx>
---
 src/lxc/lxc_container.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/lxc/lxc_container.c b/src/lxc/lxc_container.c
index 124b441..e1eb434 100644
--- a/src/lxc/lxc_container.c
+++ b/src/lxc/lxc_container.c
@@ -616,7 +616,7 @@ static int lxcContainerResolveSymlinks(virDomainFSDefPtr fs, bool gentle)
 {
     char *newroot;
 
-    if (!fs->src || fs->symlinksResolved)
+    if (!fs->src || !fs->src->path || fs->symlinksResolved)
         return 0;
 
     if (access(fs->src->path, F_OK)) {
-- 
2.7.4

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