CVE-2024-49970

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

drm/amd/display: Implement bounds check for stream encoder creation in DCN401

'stream_enc_regs' array is an array of dcn10_stream_enc_registers

structures. The array is initialized with four elements, corresponding

to the four calls to stream_enc_regs() in the array initializer. This

means that valid indices for this array are 0, 1, 2, and 3.

The error message 'stream_enc_regs' 4 <= 5 below, is indicating that

there is an attempt to access this array with an index of 5, which is

out of bounds. This could lead to undefined behavior

Here, eng_id is used as an index to access the stream_enc_regs array. If

eng_id is 5, this would result in an out-of-bounds access on the

stream_enc_regs array.

Thus fixing Buffer overflow error in dcn401_stream_encoder_create

Found by smatch:

drivers/gpu/drm/amd/amdgpu/../display/dc/resource/dcn401/dcn401_resource.c:1209 dcn401_stream_encoder_create() error: buffer overflow 'stream_enc_regs' 4 <= 5