fix: incremental on invalid container causes segfault

counterpart of 417f346ee0 for incremental.
If md device has metadata_version="none" super_by_fd() matches
supertype=super0.
Call of load_container() dereferences null, so we have to forbid it.

Signed-off-by: Przemyslaw Czarnowski <przemyslaw.hawrylewicz.czarnowski@intel.com>
Signed-off-by: NeilBrown <neilb@suse.de>

diff --git a/Incremental.c b/Incremental.c
index 8cae1ee5cb9f9bf54490adc9993117e41de81cf8..9399f5bec27f6f35356c8abe0df009f9d57e9c83 100644 (file)
--- a/Incremental.c
+++ b/Incremental.c
@@ -134,7 +134,7 @@ int Incremental(char *devname, int verbose, int runstop,
        if (must_be_container(dfd)) {
                if (!st)
                        st = super_by_fd(dfd, NULL);
-               if (st)
+               if (st && st->ss->load_container)
                        rv = st->ss->load_container(st, dfd, NULL);
 
                close(dfd);