From patchwork Wed Mar 11 08:47:07 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Takashi Iwai X-Patchwork-Id: 11431143 X-Patchwork-Delegate: kvalo@adurom.com Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 898EC921 for ; Wed, 11 Mar 2020 08:47:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 72AF120637 for ; Wed, 11 Mar 2020 08:47:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728651AbgCKIrU (ORCPT ); Wed, 11 Mar 2020 04:47:20 -0400 Received: from mx2.suse.de ([195.135.220.15]:55828 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728242AbgCKIrU (ORCPT ); Wed, 11 Mar 2020 04:47:20 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx2.suse.de (Postfix) with ESMTP id 751C7ADDA; Wed, 11 Mar 2020 08:47:18 +0000 (UTC) From: Takashi Iwai To: linux-wireless@vger.kernel.org Cc: Kalle Valo , ath11k@lists.infradead.org Subject: [PATCH 1/7] ath11k: Use scnprintf() for avoiding potential buffer overflow Date: Wed, 11 Mar 2020 09:47:07 +0100 Message-Id: <20200311084713.18220-2-tiwai@suse.de> X-Mailer: git-send-email 2.16.4 In-Reply-To: <20200311084713.18220-1-tiwai@suse.de> References: <20200311084713.18220-1-tiwai@suse.de> Sender: linux-wireless-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org Since snprintf() returns the would-be-output size instead of the actual output size, the succeeding calls may go beyond the given buffer limit. Fix it by replacing with scnprintf(). Cc: ath11k@lists.infradead.org Signed-off-by: Takashi Iwai --- drivers/net/wireless/ath/ath11k/debug_htt_stats.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) diff --git a/drivers/net/wireless/ath/ath11k/debug_htt_stats.c b/drivers/net/wireless/ath/ath11k/debug_htt_stats.c index 9939e909628f..f44dec839e70 100644 --- a/drivers/net/wireless/ath/ath11k/debug_htt_stats.c +++ b/drivers/net/wireless/ath/ath11k/debug_htt_stats.c @@ -22,7 +22,7 @@ do { \ int index = 0; u8 i; \ for (i = 0; i < len; i++) { \ - index += snprintf(out + index, HTT_MAX_STRING_LEN - index, \ + index += scnprintf(out + index, HTT_MAX_STRING_LEN - index, \ " %u:%u,", i, arr[i]); \ if (index < 0 || index >= HTT_MAX_STRING_LEN) \ break; \ @@ -46,7 +46,7 @@ static inline void htt_print_stats_string_tlv(const void *tag_buf, len += HTT_DBG_OUT(buf + len, buf_len - len, "HTT_STATS_STRING_TLV:"); for (i = 0; i < tag_len; i++) { - index += snprintf(&data[index], + index += scnprintf(&data[index], HTT_MAX_STRING_LEN - index, "%.*s", 4, (char *)&(htt_stats_buf->data[i])); if (index >= HTT_MAX_STRING_LEN) @@ -3097,7 +3097,7 @@ static inline void htt_print_rx_pdev_rate_stats_tlv(const void *tag_buf, index = 0; for (i = 0; i < HTT_RX_PDEV_STATS_RXEVM_MAX_PILOTS_PER_NSS; i++) - index += snprintf(&rx_pilot_evm_db[j][index], + index += scnprintf(&rx_pilot_evm_db[j][index], HTT_MAX_STRING_LEN - index, " %u:%d,", i, @@ -3109,7 +3109,7 @@ static inline void htt_print_rx_pdev_rate_stats_tlv(const void *tag_buf, index = 0; memset(str_buf, 0x0, HTT_MAX_STRING_LEN); for (i = 0; i < HTT_RX_PDEV_STATS_NUM_SPATIAL_STREAMS; i++) - index += snprintf(&str_buf[index], + index += scnprintf(&str_buf[index], HTT_MAX_STRING_LEN - index, " %u:%d,", i, htt_stats_buf->rx_pilot_evm_db_mean[i]); len += HTT_DBG_OUT(buf + len, buf_len - len, "pilot_evm_dB_mean = %s ", str_buf); @@ -3217,7 +3217,7 @@ static inline void htt_print_rx_pdev_rate_stats_tlv(const void *tag_buf, index = 0; memset(str_buf, 0x0, HTT_MAX_STRING_LEN); for (i = 0; i < HTT_RX_PDEV_MAX_OFDMA_NUM_USER; i++) - index += snprintf(&str_buf[index], + index += scnprintf(&str_buf[index], HTT_MAX_STRING_LEN - index, " %u:%d,", i, htt_stats_buf->rx_ul_fd_rssi[j][i]); @@ -3232,7 +3232,7 @@ static inline void htt_print_rx_pdev_rate_stats_tlv(const void *tag_buf, index = 0; memset(str_buf, 0x0, HTT_MAX_STRING_LEN); for (i = 0; i < HTT_RX_PDEV_STATS_NUM_BW_COUNTERS; i++) - index += snprintf(&str_buf[index], + index += scnprintf(&str_buf[index], HTT_MAX_STRING_LEN - index, " %u:%d,", i,