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 A0FC11D8326; Thu, 1 Aug 2024 00:33:37 +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=1722472417; cv=none; b=eG40h6pOJ0nRqPz/uFtt1khLXrSyL7usGMyIQxznKJtkKuslV068wzgrTXkbvLGOxNlfB6oTGqWbHah9o6KumOAQ6SYl5a/1azL8LLglHbMK61egzsIEjoUzmRlDSvgysbzpIMk3VFBf90oKFaz5FM/LJYZaR2GrQlqsZ2qGqps= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722472417; c=relaxed/simple; bh=nXnKs/+JsqnjBgbIDB8+2kHNEBoTVbUppRoBRcjxYi8=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=mgnopSdMosr37CxECnxOtKfKBsa6k2sf2sI0qlBdI5sMRsvQLb8/Urhs3ABys5dMP23SFtMziP7oSPO4hsQhbhhpQ1+iJ1Qrow2wSrdvjrtBJHV84ILPlD0B3WvonCppc9WIpu2pPbY0g4kDnrEEqZLSARuyXuV/Fj/97OIgcFE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=emhUdh4R; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="emhUdh4R" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6FA09C32786; Thu, 1 Aug 2024 00:33:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1722472417; bh=nXnKs/+JsqnjBgbIDB8+2kHNEBoTVbUppRoBRcjxYi8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=emhUdh4RODLbiilrDqkcRroEZiMCQx4/rhoW+pSsUdy6rltPtagpuYDHwIq+D28bi 6eEp0DKUixitYmMNbNiN7EAGju+3Mua/bmq35BOQC0jviOEEEmEgTWKoDUtX75H9Sn qOb8DwX6jUjiQEymfLKn8ID/GyLWip9HOSby047PHja+6qehXx39T40QzBSrZcuI0l 2+Wh/N1dazu8jcJXEP764TSXw1h67+fn8g8I+se9eiiDCeOBwTsAJiHk3yxktq5YbN dfeGHDWOWuMuiA2ydUiwAOBAo3hN7nSau7itIe07JBcvK9moX1Mco1AANWCPXlgr+r w1KF92R8jDNog== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Hersen Wu , Alex Hung , Tom Chung , Daniel Wheeler , Alex Deucher , Sasha Levin , harry.wentland@amd.com, sunpeng.li@amd.com, Rodrigo.Siqueira@amd.com, christian.koenig@amd.com, Xinhui.Pan@amd.com, airlied@gmail.com, daniel@ffwll.ch, jiapeng.chong@linux.alibaba.com, wayne.lin@amd.com, amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org Subject: [PATCH AUTOSEL 5.15 09/47] drm/amd/display: Add array index check for hdcp ddc access Date: Wed, 31 Jul 2024 20:30:59 -0400 Message-ID: <20240801003256.3937416-9-sashal@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240801003256.3937416-1-sashal@kernel.org> References: <20240801003256.3937416-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-stable-base: Linux 5.15.164 Content-Transfer-Encoding: 8bit From: Hersen Wu [ Upstream commit 4e70c0f5251c25885c31ee84a31f99a01f7cf50e ] [Why] Coverity reports OVERRUN warning. Do not check if array index valid. [How] Check msg_id valid and valid array index. Reviewed-by: Alex Hung Acked-by: Tom Chung Signed-off-by: Hersen Wu Tested-by: Daniel Wheeler Signed-off-by: Alex Deucher Signed-off-by: Sasha Levin --- .../drm/amd/display/modules/hdcp/hdcp_ddc.c | 28 ++++++++++++++++--- 1 file changed, 24 insertions(+), 4 deletions(-) diff --git a/drivers/gpu/drm/amd/display/modules/hdcp/hdcp_ddc.c b/drivers/gpu/drm/amd/display/modules/hdcp/hdcp_ddc.c index 8e9caae7c9559..1b2df97226a3f 100644 --- a/drivers/gpu/drm/amd/display/modules/hdcp/hdcp_ddc.c +++ b/drivers/gpu/drm/amd/display/modules/hdcp/hdcp_ddc.c @@ -156,11 +156,16 @@ static enum mod_hdcp_status read(struct mod_hdcp *hdcp, uint32_t cur_size = 0; uint32_t data_offset = 0; - if (msg_id == MOD_HDCP_MESSAGE_ID_INVALID) { + if (msg_id == MOD_HDCP_MESSAGE_ID_INVALID || + msg_id >= MOD_HDCP_MESSAGE_ID_MAX) return MOD_HDCP_STATUS_DDC_FAILURE; - } if (is_dp_hdcp(hdcp)) { + int num_dpcd_addrs = sizeof(hdcp_dpcd_addrs) / + sizeof(hdcp_dpcd_addrs[0]); + if (msg_id >= num_dpcd_addrs) + return MOD_HDCP_STATUS_DDC_FAILURE; + while (buf_len > 0) { cur_size = MIN(buf_len, HDCP_MAX_AUX_TRANSACTION_SIZE); success = hdcp->config.ddc.funcs.read_dpcd(hdcp->config.ddc.handle, @@ -175,6 +180,11 @@ static enum mod_hdcp_status read(struct mod_hdcp *hdcp, data_offset += cur_size; } } else { + int num_i2c_offsets = sizeof(hdcp_i2c_offsets) / + sizeof(hdcp_i2c_offsets[0]); + if (msg_id >= num_i2c_offsets) + return MOD_HDCP_STATUS_DDC_FAILURE; + success = hdcp->config.ddc.funcs.read_i2c( hdcp->config.ddc.handle, HDCP_I2C_ADDR, @@ -219,11 +229,16 @@ static enum mod_hdcp_status write(struct mod_hdcp *hdcp, uint32_t cur_size = 0; uint32_t data_offset = 0; - if (msg_id == MOD_HDCP_MESSAGE_ID_INVALID) { + if (msg_id == MOD_HDCP_MESSAGE_ID_INVALID || + msg_id >= MOD_HDCP_MESSAGE_ID_MAX) return MOD_HDCP_STATUS_DDC_FAILURE; - } if (is_dp_hdcp(hdcp)) { + int num_dpcd_addrs = sizeof(hdcp_dpcd_addrs) / + sizeof(hdcp_dpcd_addrs[0]); + if (msg_id >= num_dpcd_addrs) + return MOD_HDCP_STATUS_DDC_FAILURE; + while (buf_len > 0) { cur_size = MIN(buf_len, HDCP_MAX_AUX_TRANSACTION_SIZE); success = hdcp->config.ddc.funcs.write_dpcd( @@ -239,6 +254,11 @@ static enum mod_hdcp_status write(struct mod_hdcp *hdcp, data_offset += cur_size; } } else { + int num_i2c_offsets = sizeof(hdcp_i2c_offsets) / + sizeof(hdcp_i2c_offsets[0]); + if (msg_id >= num_i2c_offsets) + return MOD_HDCP_STATUS_DDC_FAILURE; + hdcp->buf[0] = hdcp_i2c_offsets[msg_id]; memmove(&hdcp->buf[1], buf, buf_len); success = hdcp->config.ddc.funcs.write_i2c( -- 2.43.0