open_without_symlink: Account when prefix is empty string

In the current implementation, the open_without_symlink function
will default to opening the root mount only if the passed rootfs
prefix is null. It doesn't account for the case where this prefix
is passed as an empty string.

Properly handle this second case as well.

Signed-off-by: Bogdan Purcareata <bogdan.purcareata@nxp.com>
Acked-by: Serge E. Hallyn <serge.hallyn@ubuntu.com>

diff --git a/src/lxc/utils.c b/src/lxc/utils.c
index 214c5a8c91867c76b3bae27260c275273c7c9b16..3d4d6ad0688fea45954999881a0e7754428a4002 100644 (file)
--- a/src/lxc/utils.c
+++ b/src/lxc/utils.c
@@ -1267,7 +1267,7 @@ static int open_without_symlink(const char *target, const char *prefix_skip)
        fulllen = strlen(target);
 
        /* make sure prefix-skip makes sense */
-       if (prefix_skip) {
+       if (prefix_skip && strlen(prefix_skip) > 0) {
                curlen = strlen(prefix_skip);
                if (!is_subdir(target, prefix_skip, curlen)) {
                        ERROR("WHOA there - target '%s' didn't start with prefix '%s'",