CVE-2026-43337 Linux内核AMD显卡驱动空指针解引用漏洞

#include <stdio.h> #include <stdlib.h> // Mock structures to simulate the kernel environment struct dc { void *res_pool; }; struct res_pool_funcs { void (*update_bw_bounding_box)(struct dc *dc); }; struct res_pool { struct res_pool_funcs *funcs; }; // Vulnerable function logic extracted from dcn401_init_hw void vulnerable_logic(struct dc *dc, int fams2_enable, int freq_changed) { struct res_pool *pool = (struct res_pool *)dc->res_pool; void *update_bb = pool->funcs->update_bw_bounding_box; // The vulnerable condition if ((!fams2_enable && update_bb) || freq_changed) { printf("Condition met. Calling callback...\n"); // This line causes NULL pointer dereference if update_bb is NULL but freq_changed is true ((void (*)(struct dc *))update_bb)(dc); } } int main() { struct dc dev_ctx = {0}; struct res_pool pool_ctx = {0}; struct res_pool_funcs funcs_ctx = {0}; // Setup mock environment with NULL callback funcs_ctx.update_bw_bounding_box = NULL; pool_ctx.funcs = &funcs_ctx; dev_ctx.res_pool = &pool_ctx; printf("Triggering vulnerability with freq_changed=1 and callback=NULL\n"); // Scenario: fams2_enable=0, freq_changed=1, callback=NULL // Logic: (!0 && NULL) || 1 -> (1 && 0) || 1 -> 0 || 1 -> 1 (True) // Result: NULL pointer dereference crash vulnerable_logic(&dev_ctx, 0, 1); return 0; }