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 7B63526CE11; Fri, 15 May 2026 16:23:52 +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=1778862232; cv=none; b=MQ5Pfl8WEWrf97grgyJQ51+Yg7kdOxlGWpDUDdMr7erljN6AOdSUrnTjYmKyeLdatptyD3OJop2PQaGH/3ekJZf6PkVzyoAnGw64+HRCxdMWA8/mBBaXdyp0CmnBwD2m1B0V8a7hQRmxt7KKtPYtTi7zUoxl5QMZA9m5DZ+Vzbk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778862232; c=relaxed/simple; bh=YnXqCmsA9zxRV/vO+LzE6a2hXMOvLOecFhhafAh6YOw=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=Mh7gd7iTjhcKa6n8nB9P8DacUqhD5YIgeeFV/RbDPRPjZcupjRts+WB+8BisEC5RFGsiEBvoawwZ3Hmt+MaP/ND3X1juNhWfoASnjViQfsz2qX4bKqm0x+03rlECLkhEBeFVnOlb7EK3ULNid7B3xuQv2+OtvujpUhfGVBfVS0Q= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=AVKGXyB+; 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="AVKGXyB+" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 129A3C2BCB0; Fri, 15 May 2026 16:23:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1778862232; bh=YnXqCmsA9zxRV/vO+LzE6a2hXMOvLOecFhhafAh6YOw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=AVKGXyB+SzkXp4eI5k9LDnhIVoOpd2nOhN/6Kaf44nNIESB7KKQNua95lfok5rtqx J66po+7WH/quElDE3VPpbnooXbNdzK8Cr3RhUQ20dgh9dCH5gwj3q+TFl/P5RE8apW jYLQ0YlVGMbsc221crSxuFb9ltAUXiogLBWPXVbE= 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 6.18 107/188] drm/amdgpu/vcn4: Prevent OOB reads when parsing IB Date: Fri, 15 May 2026 17:48:44 +0200 Message-ID: <20260515154659.651328929@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 2444eb0ec8283f4a3845eb7febad378476e1ba3c upstream. Rewrite the IB parsing to use amdgpu_ib_get_value() which handles the bounds checks. Signed-off-by: Benjamin Cheng Acked-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 | 23 ++++++++++++----------- 1 file changed, 12 insertions(+), 11 deletions(-) --- a/drivers/gpu/drm/amd/amdgpu/vcn_v4_0.c +++ b/drivers/gpu/drm/amd/amdgpu/vcn_v4_0.c @@ -1912,9 +1912,10 @@ out: static int vcn_v4_0_enc_find_ib_param(struct amdgpu_ib *ib, uint32_t id, int start) { int i; + uint32_t len; - for (i = start; i < ib->length_dw && ib->ptr[i] >= 8; i += ib->ptr[i] / 4) { - if (ib->ptr[i + 1] == id) + for (i = start; (len = amdgpu_ib_get_value(ib, i)) >= 8; i += len / 4) { + if (amdgpu_ib_get_value(ib, i + 1) == id) return i; } return -1; @@ -1925,8 +1926,6 @@ static int vcn_v4_0_ring_patch_cs_in_pla struct amdgpu_ib *ib) { struct amdgpu_ring *ring = amdgpu_job_ring(job); - struct amdgpu_vcn_decode_buffer *decode_buffer; - uint64_t addr; uint32_t val; int idx = 0, sidx; @@ -1937,20 +1936,22 @@ static int vcn_v4_0_ring_patch_cs_in_pla while ((idx = vcn_v4_0_enc_find_ib_param(ib, RADEON_VCN_ENGINE_INFO, idx)) >= 0) { val = amdgpu_ib_get_value(ib, idx + 2); /* RADEON_VCN_ENGINE_TYPE */ if (val == RADEON_VCN_ENGINE_TYPE_DECODE) { - decode_buffer = (struct amdgpu_vcn_decode_buffer *)&ib->ptr[idx + 6]; + uint32_t valid_buf_flag = amdgpu_ib_get_value(ib, idx + 6); + uint64_t msg_buffer_addr; - if (!(decode_buffer->valid_buf_flag & 0x1)) + if (!(valid_buf_flag & 0x1)) return 0; - addr = ((u64)decode_buffer->msg_buffer_address_hi) << 32 | - decode_buffer->msg_buffer_address_lo; - return vcn_v4_0_dec_msg(p, job, addr); + msg_buffer_addr = ((u64)amdgpu_ib_get_value(ib, idx + 7)) << 32 | + amdgpu_ib_get_value(ib, idx + 8); + return vcn_v4_0_dec_msg(p, job, msg_buffer_addr); } else if (val == RADEON_VCN_ENGINE_TYPE_ENCODE) { sidx = vcn_v4_0_enc_find_ib_param(ib, RENCODE_IB_PARAM_SESSION_INIT, idx); - if (sidx >= 0 && ib->ptr[sidx + 2] == RENCODE_ENCODE_STANDARD_AV1) + if (sidx >= 0 && + amdgpu_ib_get_value(ib, sidx + 2) == RENCODE_ENCODE_STANDARD_AV1) return vcn_v4_0_limit_sched(p, job); } - idx += ib->ptr[idx] / 4; + idx += amdgpu_ib_get_value(ib, idx) / 4; } return 0; }