From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 2F2EE3E00AB; Fri, 15 May 2026 16:22:27 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778862147; cv=none; b=mJmx+UoL4LjOLM8zF+L8h5RxGX0k5QnzqknHkcX2xd1H4oT74sWfrzRIKJQHK88XdrtJNh6bRFTvGs/qURvGtEzAFaUcMfOQMKNvAVTVprSPgqmFy/lo/wZ5OsMf64uNJ7NMa1o7z+oMLEBOTY88qJAdO7u6MhUx/3I3yc6hS2Q= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778862147; c=relaxed/simple; bh=28RkSmIbMLuYb3klN3LSAugfa8tJXbTwUgYzIIj+/9s=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=Cx/nWzxLKBa4uKAJ+8NJYY1QOyLamUxSgnzcHltxtHupUEqZhWvk9KgWTj1JQSQW/Cn783/ZEFptnqpuaVzhflUEutr7wY/4/2kS7d6tUdddpJSW/MVKNhy/+uXmVvhQzTwavLDrAyX7bCtNvi78mju3WhdYKt+3k4s5iVdn0K8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=d697s6c1; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="d697s6c1" Received: by smtp.kernel.org (Postfix) with ESMTPSA id B9761C2BCB0; Fri, 15 May 2026 16:22:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1778862147; bh=28RkSmIbMLuYb3klN3LSAugfa8tJXbTwUgYzIIj+/9s=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=d697s6c1BMQSNk+78NPH3+W+CPggukZbYup2q9R1Qloi7kvVm0X6OL9qptcCPfG12 i8UWT2RSRwZjoFaMcLLkMfDOm4I70t0nogcV5M4xVmTmxyEifP17+pLw/7lhLy8eyV CnIJpYgNzcQkmPSnM9dI/6SmPLQ4bfps9Yd/Be0k= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Benjamin Cheng , =?UTF-8?q?Christian=20K=C3=B6nig?= , Ruijing Dong , Alex Deucher Subject: [PATCH 6.18 109/188] drm/amdgpu/vcn4: Prevent OOB reads when parsing dec msg Date: Fri, 15 May 2026 17:48:46 +0200 Message-ID: <20260515154659.694623652@linuxfoundation.org> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260515154657.309489048@linuxfoundation.org> References: <20260515154657.309489048@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-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 6.18-stable review patch. If anyone has any objections, please let me know. ------------------ From: Benjamin Cheng commit 0a78f2bac1424deb7c9d5e09c6b8e849d8e8b648 upstream. Check bounds against the end of the BO whenever we access the msg. Signed-off-by: Benjamin Cheng Reviewed-by: Christian König Reviewed-by: Ruijing Dong Signed-off-by: Alex Deucher Cc: stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman --- drivers/gpu/drm/amd/amdgpu/vcn_v4_0.c | 21 ++++++++++++++++++--- 1 file changed, 18 insertions(+), 3 deletions(-) --- a/drivers/gpu/drm/amd/amdgpu/vcn_v4_0.c +++ b/drivers/gpu/drm/amd/amdgpu/vcn_v4_0.c @@ -1825,7 +1825,7 @@ static int vcn_v4_0_dec_msg(struct amdgp { struct ttm_operation_ctx ctx = { false, false }; struct amdgpu_bo_va_mapping *map; - uint32_t *msg, num_buffers; + uint32_t *msg, num_buffers, len_dw; struct amdgpu_bo *bo; uint64_t start, end; unsigned int i; @@ -1846,6 +1846,11 @@ static int vcn_v4_0_dec_msg(struct amdgp return -EINVAL; } + if (end - addr < 16) { + DRM_ERROR("VCN messages must be at least 4 DWORDs!\n"); + return -EINVAL; + } + bo->flags |= AMDGPU_GEM_CREATE_CPU_ACCESS_REQUIRED; amdgpu_bo_placement_from_domain(bo, bo->allowed_domains); r = ttm_bo_validate(&bo->tbo, &bo->placement, &ctx); @@ -1862,8 +1867,8 @@ static int vcn_v4_0_dec_msg(struct amdgp msg = ptr + addr - start; - /* Check length */ if (msg[1] > end - addr) { + DRM_ERROR("VCN message header does not fit in BO!\n"); r = -EINVAL; goto out; } @@ -1871,7 +1876,16 @@ static int vcn_v4_0_dec_msg(struct amdgp if (msg[3] != RDECODE_MSG_CREATE) goto out; + len_dw = msg[1] / 4; num_buffers = msg[2]; + + /* Verify that all indices fit within the claimed length. Each index is 4 DWORDs */ + if (num_buffers > len_dw || 6 + num_buffers * 4 > len_dw) { + DRM_ERROR("VCN message has too many buffers!\n"); + r = -EINVAL; + goto out; + } + for (i = 0, msg = &msg[6]; i < num_buffers; ++i, msg += 4) { uint32_t offset, size, *create; @@ -1881,7 +1895,8 @@ static int vcn_v4_0_dec_msg(struct amdgp offset = msg[1]; size = msg[2]; - if (offset + size > end) { + if (size < 4 || offset + size > end - addr) { + DRM_ERROR("VCN message buffer exceeds BO bounds!\n"); r = -EINVAL; goto out; }