[PATCH next] drm/amd/display: Fix possible NULL dereference in dc_dmub_srv_cmd_run_list()

[Harshit Mogalapalli]

We have a NULL check for 'dc_dmub_srv' in dc_dmub_srv_cmd_run_list()
but we are dereferencing it before checking.

Fix this moving the dereference next to NULL check.

This issue is found with Smatch(static analysis tool).

Fixes: e97cc04fe0fb ("drm/amd/display: refactor dmub commands into single 
function")
Signed-off-by: Harshit Mogalapalli <harshit.m.mogalapa...@oracle.com>
---
Only compile tested.
---
 drivers/gpu/drm/amd/display/dc/dc_dmub_srv.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/display/dc/dc_dmub_srv.c 
b/drivers/gpu/drm/amd/display/dc/dc_dmub_srv.c
index d15ec32243e2..62d3473c32bc 100644
--- a/drivers/gpu/drm/amd/display/dc/dc_dmub_srv.c
+++ b/drivers/gpu/drm/amd/display/dc/dc_dmub_srv.c
@@ -125,7 +125,7 @@ bool dc_dmub_srv_cmd_run(struct dc_dmub_srv *dc_dmub_srv, 
union dmub_rb_cmd *cmd
 
 bool dc_dmub_srv_cmd_run_list(struct dc_dmub_srv *dc_dmub_srv, unsigned int 
count, union dmub_rb_cmd *cmd_list, enum dm_dmub_wait_type wait_type)
 {
-       struct dc_context *dc_ctx = dc_dmub_srv->ctx;
+       struct dc_context *dc_ctx;
        struct dmub_srv *dmub;
        enum dmub_status status;
        int i;
@@ -133,6 +133,7 @@ bool dc_dmub_srv_cmd_run_list(struct dc_dmub_srv 
*dc_dmub_srv, unsigned int coun
        if (!dc_dmub_srv || !dc_dmub_srv->dmub)
                return false;
 
+       dc_ctx = dc_dmub_srv->ctx;
        dmub = dc_dmub_srv->dmub;
 
        for (i = 0 ; i < count; i++) {
-- 
2.38.1