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

drm/amd/display: Add NULL check for clk_mgr and clk_mgr->funcs in dcn401_init_hw

This commit addresses a potential null pointer dereference issue in the
dcn401_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/dcn401/dcn401_hwseq.c:416 dcn401_init_hw() error: we previously assumed 'dc->clk_mgr' could be null (see line 225)

References

• https://nvd.nist.gov/vuln/detail/CVE-2024-49916
• https://git.kernel.org/stable/c/4b6377f0e96085cbec96eb7f0b282430ccdd3d75
• https://git.kernel.org/stable/c/ac1c41e318074d8a9ea925787e366be15d7645e8