target: fix segmentation fault on target create

In the unusual (and even incorrect) case of running the command
target create ...
before defining an adapter and the associated transport, the
command causes a segmentation fault. E.g.:
	openocd -c 'target create cpu cortex-m -endian little'

Check that get_current_transport() returns a valid pointer before
referencing it.

Change-Id: I9796a7e92196ef3df5c7152b27c34102045dc9e7
Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com>
Reviewed-on: https://review.openocd.org/c/openocd/+/7962
Reviewed-by: Tomas Vanek <vanekt@fbl.cz>
Tested-by: jenkins

diff --git a/src/target/target.c b/src/target/target.c
index d368cb5156f4befdf9a895d8a9dc1122da1d694c..148bc9fb7169c50ff7b1a9f072599cfd9245c472 100644 (file)
--- a/src/target/target.c
+++ b/src/target/target.c
@@ -6143,7 +6143,7 @@ static int target_create(struct jim_getopt_info *goi)
        if (e != JIM_OK)
                return e;
        struct transport *tr = get_current_transport();
-       if (tr->override_target) {
+       if (tr && tr->override_target) {
                e = tr->override_target(&cp);
                if (e != ERROR_OK) {
                        LOG_ERROR("The selected transport doesn't support this target");