drm/display: fix possible null-pointer dereference in dcn10_set_clock()

The variable dc->clk_mgr is checked in:
  if (dc->clk_mgr && dc->clk_mgr->funcs->get_clock)

This indicates dc->clk_mgr can be NULL.
However, it is dereferenced in:
    if (!dc->clk_mgr->funcs->get_clock)

To fix this null-pointer dereference, check dc->clk_mgr and the function
pointer dc->clk_mgr->funcs->get_clock earlier, and return if one of them
is NULL.

Reported-by: TOTE Robot <oslab@tsinghua.edu.cn>
Signed-off-by: Tuo Li <islituo@gmail.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c
index 35af040..df8a771 100644 (file)
--- a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c
@@ -3641,13 +3641,12 @@ enum dc_status dcn10_set_clock(struct dc *dc,
        struct dc_clock_config clock_cfg = {0};
        struct dc_clocks *current_clocks = &context->bw_ctx.bw.dcn.clk;
 
-       if (dc->clk_mgr && dc->clk_mgr->funcs->get_clock)
-                               dc->clk_mgr->funcs->get_clock(dc->clk_mgr,
-                                               context, clock_type, &clock_cfg);
-
-       if (!dc->clk_mgr->funcs->get_clock)
+       if (!dc->clk_mgr || !dc->clk_mgr->funcs->get_clock)
                return DC_FAIL_UNSUPPORTED_1;
 
+       dc->clk_mgr->funcs->get_clock(dc->clk_mgr,
+               context, clock_type, &clock_cfg);
+
        if (clk_khz > clock_cfg.max_clock_khz)
                return DC_FAIL_CLK_EXCEED_MAX;
 
@@ -3665,7 +3664,7 @@ enum dc_status dcn10_set_clock(struct dc *dc,
        else
                return DC_ERROR_UNEXPECTED;
 
-       if (dc->clk_mgr && dc->clk_mgr->funcs->update_clocks)
+       if (dc->clk_mgr->funcs->update_clocks)
                                dc->clk_mgr->funcs->update_clocks(dc->clk_mgr,
                                context, true);
        return DC_OK;