From: Qiuxu Zhuo <qiuxu.zhuo@intel.com> mainline inclusion from mainline-v6.16-rc1 commit 20d2d476b3ae18041be423671a8637ed5ffd6958 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/ICLGFA CVE: CVE-2025-38298 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i... -------------------------------- After loading i10nm_edac (which automatically loads skx_edac_common), if unload only i10nm_edac, then reload it and perform error injection testing, a general protection fault may occur: mce: [Hardware Error]: Machine check events logged Oops: general protection fault ... ... Workqueue: events mce_gen_pool_process RIP: 0010:string+0x53/0xe0 ... Call Trace: <TASK> ? die_addr+0x37/0x90 ? exc_general_protection+0x1e7/0x3f0 ? asm_exc_general_protection+0x26/0x30 ? string+0x53/0xe0 vsnprintf+0x23e/0x4c0 snprintf+0x4d/0x70 skx_adxl_decode+0x16a/0x330 [skx_edac_common] skx_mce_check_error.part.0+0xf8/0x220 [skx_edac_common] skx_mce_check_error+0x17/0x20 [skx_edac_common] ... The issue arose was because the variable 'adxl_component_count' (inside skx_edac_common), which counts the ADXL components, was not reset. During the reloading of i10nm_edac, the count was incremented by the actual number of ADXL components again, resulting in a count that was double the real number of ADXL components. This led to an out-of-bounds reference to the ADXL component array, causing the general protection fault above. Fix this issue by resetting the 'adxl_component_count' in adxl_put(), which is called during the unloading of {skx,i10nm}_edac. Fixes: 123b15863550 ("EDAC, i10nm: make skx_common.o a separate module") Reported-by: Feng Xu <feng.f.xu@intel.com> Signed-off-by: Qiuxu Zhuo <qiuxu.zhuo@intel.com> Signed-off-by: Tony Luck <tony.luck@intel.com> Tested-by: Feng Xu <feng.f.xu@intel.com> Link: https://lore.kernel.org/r/20250417150724.1170168-2-qiuxu.zhuo@intel.com Signed-off-by: Xiaomeng Zhang <zhangxiaomeng13@huawei.com> --- drivers/edac/skx_common.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/edac/skx_common.c b/drivers/edac/skx_common.c index 534d035c4ee8..3d912671d4a3 100644 --- a/drivers/edac/skx_common.c +++ b/drivers/edac/skx_common.c @@ -115,6 +115,7 @@ EXPORT_SYMBOL_GPL(skx_adxl_get); void skx_adxl_put(void) { + adxl_component_count = 0; kfree(adxl_values); kfree(adxl_msg); } -- 2.34.1