From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D1746376A0B; Thu, 30 Jul 2026 16:03:19 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785427400; cv=none; b=EEM7cFLcm89jSwvF21+PdLF+MnAOR2dvjz58Y93tzneXAiEYYGlKpV+I0W0VYY1/jgnMjjdT4h2g5XphJv4aGNODxcQbDFSUFk2jj45wVMfd/0rmS90689xPzd+eRkyIA9JlPpin5bFuRN7UHVeUVyBcTFmLuKHc25fjBsNjD3Q= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785427400; c=relaxed/simple; bh=L3B6gQSTVvKA1yzF5ENsh/aRu7KJ5PIvYNhtR0Rra7g=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=K1/+kvqjz6ASiJo+m814XaocoNoujaZDTJNrQOFmKWwF7jBD/enI2Ce55uET3D4KaGk/JNBrU/Y/uynzNCxcj6hY4SlWhyCMVbWV1O9jj6ItqkPLzWPcu+oaMgkPdS2y3y2chM3AFKHz0V6bPTc9YCW7j5C3b9NoRWr6T77HGEM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=hzUtQWC+; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="hzUtQWC+" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3A6211F00A3A; Thu, 30 Jul 2026 16:03:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1785427399; bh=FMEW+goAeJbbCSOCuX0A3Aw8Yw24lONi3tE341SDLBI=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=hzUtQWC+FvPbkHguIQ4MOHyOw3gJSxPaPlxwrvzni3gPCNctwbEiJYolVPKvYUD0Z acDyJ2sl+ZiDiyn+s30tytB+cWi4v0rmO4yibdNV7DUb7F/2OfSvJpqV1ipbns+TYP JE5sVD3IEVTiq3wsSk93CP2jxQB87dRvwNuX+HJk= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Li RongQing , Will Deacon , Sasha Levin Subject: [PATCH 6.6 157/484] iommu/intel: Fix out-of-bounds memset in dmar_latency_disable() Date: Thu, 30 Jul 2026 16:10:54 +0200 Message-ID: <20260730141426.876444409@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260730141423.392222816@linuxfoundation.org> References: <20260730141423.392222816@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Li RongQing [ Upstream commit 754f8efe45f87e3a9c6871b645b2f9d46d1b407b ] 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 Signed-off-by: Sasha Levin --- 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 ae64e1123f2571..08ffebdbd09cec 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); } -- 2.53.0