From nobody Fri Jul 24 23:31:00 2026 Received: from cstnet.cn (smtp25.cstnet.cn [159.226.251.25]) (using TLSv1.2 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 068DA3E7BD0; Wed, 22 Jul 2026 04:16:43 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=159.226.251.25 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784693810; cv=none; b=l8QL4MKU+Qh9rwUn0i/bygA9ZAfkVoL+SZ8lShmWC/FueNkvKSYzvaaPX/NKN72g6ezxSFmHdBn7iekpfsHAaaA1q8I0p98H43ZN43gk9896y6T+vRnK3Uvc43tu+9wvRJ8N2UyQy570axx4yKUqD74m0HDE8k0xf/n4Da+K9SI= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784693810; c=relaxed/simple; bh=COjXA8CR44dXJ+KXqC60mO8/CY2qkCCBkKILyKl5rYg=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=Tacz1L3Yl19RFUV/GdnYgdnVdVgutgEtTsqcS5cUZIf3a8mkoM0A3xOL4UYQdbvMRpDwQga5Q/krcqyroFqw40xdOnb+OrGDq3PvM7g6RF3wf/U0fTrhHPZqIxsbzqFmb5hGD6naguZN7kc7lKHwAY8yx7GQtpRLgwPYVXJmWlQ= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=iscas.ac.cn; spf=pass smtp.mailfrom=iscas.ac.cn; arc=none smtp.client-ip=159.226.251.25 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=iscas.ac.cn Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=iscas.ac.cn Received: from localhost.localdomain (unknown [111.196.245.140]) by APP-05 (Coremail) with SMTP id zQCowAB35T8TRGBqWy67AA--.34064S2; Wed, 22 Jul 2026 12:16:19 +0800 (CST) From: Pengpeng Hou To: Rob Clark Cc: "Joerg Roedel (AMD)" , Will Deacon , Robin Murphy , linux-arm-msm@vger.kernel.org, iommu@lists.linux.dev, linux-kernel@vger.kernel.org, Pengpeng Hou Subject: [PATCH] iommu/msm: limit the per-master Machine ID list Date: Wed, 22 Jul 2026 12:16:19 +0800 Message-ID: <20260722041619.17735-1-pengpeng@iscas.ac.cn> X-Mailer: git-send-email 2.50.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-CM-TRANSID: zQCowAB35T8TRGBqWy67AA--.34064S2 X-Coremail-Antispam: 1UD129KBjvdXoWrZr4DGFW3GrW8ZFyDtw45GFg_yoWfJFX_CF 1rXas7Ar4qkFW8CF12ywsrur9IkasFvFn7GFZagwsxGasrXr1xCFy0vrZ8X39rGr48tF9r urnrua4fAry7CjkaLaAFLSUrUUUUjb8apTn2vfkv8UJUUUU8Yxn0WfASr-VFAUDa7-sFnT 9fnUUIcSsGvfJTRUUUbxkFF20E14v26r4j6ryUM7CY07I20VC2zVCF04k26cxKx2IYs7xG 6rWj6s0DM7CIcVAFz4kK6r1j6r18M28lY4IEw2IIxxk0rwA2F7IY1VAKz4vEj48ve4kI8w A2z4x0Y4vE2Ix0cI8IcVAFwI0_Gr0_Xr1l84ACjcxK6xIIjxv20xvEc7CjxVAFwI0_Gr1j 6F4UJwA2z4x0Y4vEx4A2jsIE14v26F4UJVW0owA2z4x0Y4vEx4A2jsIEc7CjxVAFwI0_Cr 1j6rxdM2AIxVAIcxkEcVAq07x20xvEncxIr21l5I8CrVACY4xI64kE6c02F40Ex7xfMcIj 6xIIjxv20xvE14v26r1q6rW5McIj6I8E87Iv67AKxVW8JVWxJwAm72CE4IkC6x0Yz7v_Jr 0_Gr1lF7xvr2IYc2Ij64vIr41lF7I21c0EjII2zVCS5cI20VAGYxC7MxkF7I0En4kS14v2 6r126r1DMxAIw28IcxkI7VAKI48JMxC20s026xCaFVCjc4AY6r1j6r4UMI8I3I0E5I8CrV AFwI0_Jr0_Jr4lx2IqxVCjr7xvwVAFwI0_JrI_JrWlx4CE17CEb7AF67AKxVWUtVW8ZwCI c40Y0x0EwIxGrwCI42IY6xIIjxv20xvE14v26r1I6r4UMIIF0xvE2Ix0cI8IcVCY1x0267 AKxVW8Jr0_Cr1UMIIF0xvE42xK8VAvwI8IcIk0rVWUJVWUCwCI42IY6I8E87Iv67AKxVWU JVW8JwCI42IY6I8E87Iv6xkF7I0E14v26r4UJVWxJrUvcSsGvfC2KfnxnUUI43ZEXa7VUj d-PUUUUUU== X-CM-SenderInfo: pshqw1xhqjqxpvfd2hldfou0/ Content-Type: text/plain; charset="utf-8" The OF translation path appends each unique stream ID from an IOMMU specifier to the fixed mids array in the per-master object. It currently has no capacity check before storing at mids[num_mids] and incrementing num_mids. Return -ENOSPC when the array is full rather than writing the next ID beyond it. Signed-off-by: Pengpeng Hou Reviewed-by: Dmitry Baryshkov --- drivers/iommu/msm_iommu.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/iommu/msm_iommu.c b/drivers/iommu/msm_iommu.c index 0ad5ff431d5b..0cc7a87037ce 100644 --- a/drivers/iommu/msm_iommu.c +++ b/drivers/iommu/msm_iommu.c @@ -622,6 +622,9 @@ static int insert_iommu_master(struct device *dev, return 0; } =20 + if (master->num_mids >=3D MAX_NUM_MIDS) + return -ENOSPC; + master->mids[master->num_mids++] =3D spec->args[0]; return 0; } --=20 2.43.0