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 BFA0721E098; Sat, 30 May 2026 17:58:15 +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=1780163896; cv=none; b=HygA3r6EqK5VkhUmRKhQMqhY4RT1mfQ/firPzysZs5W8VgRDiPdOaLwNkaCoRMLsVy0V4FgKTrKdgOZq/hvPZXQ3sMH4rRl+Hv3jDN+2jCzS0/y61PD+8qziNaurYLjLSNWMsj58YnFf1I4JSiKWY+34+oJlOFcXFP/HO1xLTXg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780163896; c=relaxed/simple; bh=9TEj/gaFit7Dv9Ms70dnlxQ3BRDdyazZRU+wLZOJ5bE=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=pL8f69Ztj1gAIHPG2EIUBbFhh5LWtSS/Zg/SG5d1hM3WLd5QJ44bHsq1IG7kfuTTBpobRIr0iq2MsQbS30Mgs9b3lJ4ZAxqyggMssz5iaUHelCEgEFPsLO5rx2dlVqvh0kstoru3lL/UNVV5Pf/3V3yi0VepDWbpI1ETZ0RUKWw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=nH+jB+Vj; 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="nH+jB+Vj" Received: by smtp.kernel.org (Postfix) with ESMTPSA id AC70A1F00893; Sat, 30 May 2026 17:58:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1780163895; bh=sSnPOMYa0zRYbIGqYebHSg7fRuhCfCZSXGHobcVO/XE=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=nH+jB+VjipXHScHel18dzcu43P0V8ory1OiyW59yRnu3+VKqRw1qq0pbKG+NiuZkC YnwzuzdBNGEZ/u1/XxnrLz1INLXRvJuUPrI2n37Bgwa8E7/c6saAIPiv/NpoQktwbB tvvIXPLx/h9SjYryYk5f/t77xNJLDdBuNMVOt5pc= 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 5.15 365/776] drm/amdgpu/vcn3: Prevent OOB reads when parsing dec msg Date: Sat, 30 May 2026 18:01:19 +0200 Message-ID: <20260530160249.994059760@linuxfoundation.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260530160240.228940103@linuxfoundation.org> References: <20260530160240.228940103@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 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Benjamin Cheng commit b193019860d61e92da395eae2011f2f6716b182f 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_v3_0.c | 23 +++++++++++++++++++---- 1 file changed, 19 insertions(+), 4 deletions(-) --- a/drivers/gpu/drm/amd/amdgpu/vcn_v3_0.c +++ b/drivers/gpu/drm/amd/amdgpu/vcn_v3_0.c @@ -1861,7 +1861,7 @@ static int vcn_v3_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; @@ -1882,6 +1882,11 @@ static int vcn_v3_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); @@ -1898,8 +1903,8 @@ static int vcn_v3_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; } @@ -1907,7 +1912,16 @@ static int vcn_v3_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; @@ -1917,14 +1931,15 @@ static int vcn_v3_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; } create = ptr + addr + offset - start; - /* H246, HEVC and VP9 can run on any instance */ + /* H264, HEVC and VP9 can run on any instance */ if (create[0] == 0x7 || create[0] == 0x10 || create[0] == 0x11) continue;