libfrog: handle NULL dir && blkdev in __fs_table_lookup_mount

If neither dir nor blkdev is set, dpath never gets set,
and then gets used (uninitalized) later on.

If we are asked where "nothing" is mounted, just return
"nowhere."

Fixes-coverity-id: 1433615
Fixes-coverity-id: 1433616
Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Eric Sandeen <sandeen@sandeen.net>

diff --git a/libfrog/paths.c b/libfrog/paths.c
index 318b48f99e1d2bd42e44e5a32c68dab7c2781786..c7895e9b2ab68aef13582e8ff8cb33dc08e80e55 100644 (file)
--- a/libfrog/paths.c
+++ b/libfrog/paths.c
@@ -98,6 +98,9 @@ __fs_table_lookup_mount(
        char            rpath[PATH_MAX];
        char            dpath[PATH_MAX];
 
+       if (!dir && !blkdev)
+               return NULL;
+
        if (dir && !realpath(dir, dpath))
                return NULL;
        if (blkdev && !realpath(blkdev, dpath))