From 754f8efe45f87e3a9c6871b645b2f9d46d1b407b Mon Sep 17 00:00:00 2001 From: Li RongQing Date: Tue, 21 Jul 2026 17:34:10 +0800 Subject: iommu/intel: Fix out-of-bounds memset in dmar_latency_disable() dmar_latency_disable() intends to zero out only the single latency_statistic entry for the given type, but the memset size was computed as sizeof(*lstat) * DMAR_LATENCY_NUM, which clears the entire array starting from &lstat[type]. When type > 0, this writes beyond the end of the allocated array, corrupting adjacent memory. Fix by using sizeof(*lstat) to clear only the target entry. Fixes: 55ee5e67a59a ("iommu/vt-d: Add common code for dmar latency performance monitors") Signed-off-by: Li RongQing Signed-off-by: Will Deacon --- drivers/iommu/intel/perf.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/iommu/intel/perf.c b/drivers/iommu/intel/perf.c index 02168f2f20a4..bec98dcbb9ec 100644 --- a/drivers/iommu/intel/perf.c +++ b/drivers/iommu/intel/perf.c @@ -63,7 +63,7 @@ void dmar_latency_disable(struct intel_iommu *iommu, enum latency_type type) return; spin_lock_irqsave(&latency_lock, flags); - memset(&lstat[type], 0, sizeof(*lstat) * DMAR_LATENCY_NUM); + memset(&lstat[type], 0, sizeof(*lstat)); spin_unlock_irqrestore(&latency_lock, flags); } -- cgit v1.3.1