In the Linux kernel, the following vulnerability has been resolved:

drm/amd/display: Add NULL check for clk_mgr and clk_mgr->funcs in dcn30_init_hw

This commit addresses a potential null pointer dereference issue in the
`dcn30_init_hw` function. The issue could occur when `dc->clk_mgr` or
`dc->clk_mgr->funcs` is null.

The fix adds a check to ensure `dc->clk_mgr` and `dc->clk_mgr->funcs` is
not null before accessing its functions. This prevents a potential null
pointer dereference.

Reported by smatch:
drivers/gpu/drm/amd/amdgpu/../display/dc/hwss/dcn30/dcn30_hwseq.c:789 dcn30_init_hw() error: we previously assumed 'dc->clk_mgr' could be null (see line 628)

kernel.org https://git.kernel.org/stable/c/5443c83eb8fd2f88c71ced38848fbf744d6206a2 [No types assigned]

kernel.org https://git.kernel.org/stable/c/56c326577971adc3a230f29dfd3aa3abdd505f5d [No types assigned]

kernel.org https://git.kernel.org/stable/c/cba7fec864172dadd953daefdd26e01742b71a6a [No types assigned]