Fix: Dereference null return value

Found by Coverity:

2. returned_null: bt_ctf_field_type_variant_get_tag_name returns null
(checked 4 out of 5 times).

3. var_assigned: Assigning: pathstr = null return value from
bt_ctf_field_type_variant_get_tag_name.

CID 1376176 (#1 of 1): Dereference null return value (NULL_RETURNS).
dereference: Dereferencing a pointer that might be null pathstr when
calling pathstr_to_field_path.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>

diff --git a/lib/ctf-ir/resolve.c b/lib/ctf-ir/resolve.c
index b4a9c58cb821df1753921ecfae6d9e8d08c2a631..c8648254faed43eaadf540e2b09d9059696d3de2 100644 (file)
--- a/lib/ctf-ir/resolve.c
+++ b/lib/ctf-ir/resolve.c
@@ -1023,6 +1023,12 @@ int resolve_sequence_or_variant_type(struct bt_ctf_field_type *type,
                abort();
        }
 
+       if (!pathstr) {
+               BT_LOGW_STR("Cannot get path string.");
+               ret = -1;
+               goto end;
+       }
+
        /* Get target field path out of path string */
        target_field_path = pathstr_to_field_path(pathstr, ctx);
        if (!target_field_path) {