Linux Kernel fbtft Framebuffer Initialization Vulnerability

A vulnerability in the Linux kernel's fbtft framebuffer driver has been addressed. The issue arose because the function fbtft_framebuffer_alloc() called fb_deferred_io_init() before properly initializing the smem_len field in the framebuffer information. This oversight caused smem_len to default to zero, triggering a warning at the start of fb_deferred_io_init() and preventing the function from executing as intended.

Impact

The vulnerability could lead to a warning being triggered during the framebuffer initialization process, potentially causing disruptions in how deferred I/O is handled for the framebuffer.