drm/amd/display: Fix index out of bounds in degamma hardware format translation

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: Fix index out of bounds in degamma hardware format translation Fixes index out of bounds issue in `cm_helper_translate_curve_to_degamma_hw_format` function. The issue could occur when the index 'i' exceeds the number of transfer function points (TRANSFER_FUNC_POINTS). The fix adds a check to ensure 'i' is within bounds before accessing the transfer function points. If 'i' is out of bounds the function returns false to indicate an error. Reported by smatch: drivers/gpu/drm/amd/amdgpu/../display/dc/dcn10/dcn10_cm_common.c:594 cm_helper_translate_curve_to_degamma_hw_format() error: buffer overflow 'output_tf->tf_pts.red' 1025 <= s32max drivers/gpu/drm/amd/amdgpu/../display/dc/dcn10/dcn10_cm_common.c:595 cm_helper_translate_curve_to_degamma_hw_format() error: buffer overflow 'output_tf->tf_pts.green' 1025 <= s32max drivers/gpu/drm/amd/amdgpu/../display/dc/dcn10/dcn10_cm_common.c:596 cm_helper_translate_curve_to_degamma_hw_format() error: buffer overflow 'output_tf->tf_pts.blue' 1025 <= s32max

References

• https://git.kernel.org/stable/c/b3dfa878257a7e98830b3009ca5831a01d8f85fc
• https://git.kernel.org/stable/c/f5f6d90087131812c1e4b9d3103f400f1624396d
• https://git.kernel.org/stable/c/c130a3c09e3746c1a09ce26c20d21d449d039b1d
• https://git.kernel.org/stable/c/c6979719012a90e5b8e3bc31725fbfdd0b9b2b79
• https://git.kernel.org/stable/c/2495c8e272d84685403506833a664fad932e453a
• https://git.kernel.org/stable/c/122e3a7a8c7bcbe3aacddd6103f67f9f36bed473
• https://git.kernel.org/stable/c/2f5da549535be8ccd2ab7c9abac8562ad370b181
• https://git.kernel.org/stable/c/07078fa5d589a7fbce8f81ea8acf7aa0021ab38e
• https://git.kernel.org/stable/c/b7e99058eb2e86aabd7a10761e76cae33d22b49f