Return-path: Received: from mail-fx0-f46.google.com ([209.85.161.46]:64532 "EHLO mail-fx0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758908Ab0GVIwg (ORCPT ); Thu, 22 Jul 2010 04:52:36 -0400 Date: Thu, 22 Jul 2010 10:52:02 +0200 From: Dan Carpenter To: "Luis R. Rodriguez" Cc: Nick Kossifidis , Jiri Slaby , Bob Copeland , "John W. Linville" , Bruno Randolf , linux-wireless@vger.kernel.org, ath5k-devel@lists.ath5k.org, kernel-janitors@vger.kernel.org Subject: [patch -next] ath5k: snprintf() returns largish values Message-ID: <20100722085202.GV17585@bicker> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Sender: linux-wireless-owner@vger.kernel.org List-ID: snprintf() returns the number of characters that would have been written (not counting the NUL character). So we can't use it as the limiter to simple_read_from_buffer() without capping it first at sizeof(buf). Signed-off-by: Dan Carpenter diff --git a/drivers/net/wireless/ath/ath5k/debug.c b/drivers/net/wireless/ath/ath5k/debug.c index ebb9c23..4cccc29 100644 --- a/drivers/net/wireless/ath/ath5k/debug.c +++ b/drivers/net/wireless/ath/ath5k/debug.c @@ -239,6 +239,9 @@ static ssize_t read_file_beacon(struct file *file, char __user *user_buf, "TSF\t\t0x%016llx\tTU: %08x\n", (unsigned long long)tsf, TSF_TO_TU(tsf)); + if (len > sizeof(buf)) + len = sizeof(buf); + return simple_read_from_buffer(user_buf, count, ppos, buf, len); } @@ -334,6 +337,9 @@ static ssize_t read_file_debug(struct file *file, char __user *user_buf, sc->debug.level == dbg_info[i].level ? '+' : ' ', dbg_info[i].level, dbg_info[i].desc); + if (len > sizeof(buf)) + len = sizeof(buf); + return simple_read_from_buffer(user_buf, count, ppos, buf, len); } @@ -433,6 +439,9 @@ static ssize_t read_file_antenna(struct file *file, char __user *user_buf, len += snprintf(buf+len, sizeof(buf)-len, "AR5K_PHY_ANT_SWITCH_TABLE_1\t0x%08x\n", v); + if (len > sizeof(buf)) + len = sizeof(buf); + return simple_read_from_buffer(user_buf, count, ppos, buf, len); } @@ -542,6 +551,9 @@ static ssize_t read_file_frameerrors(struct file *file, char __user *user_buf, len += snprintf(buf+len, sizeof(buf)-len, "[TX all\t%d]\n", st->tx_all_count); + if (len > sizeof(buf)) + len = sizeof(buf); + return simple_read_from_buffer(user_buf, count, ppos, buf, len); } @@ -681,6 +693,9 @@ static ssize_t read_file_ani(struct file *file, char __user *user_buf, ATH5K_ANI_CCK_TRIG_HIGH - (ATH5K_PHYERR_CNT_MAX - ath5k_hw_reg_read(sc->ah, AR5K_PHYERR_CNT2))); + if (len > sizeof(buf)) + len = sizeof(buf); + return simple_read_from_buffer(user_buf, count, ppos, buf, len); } @@ -766,6 +781,9 @@ static ssize_t read_file_queue(struct file *file, char __user *user_buf, len += snprintf(buf+len, sizeof(buf)-len, " len: %d\n", n); } + if (len > sizeof(buf)) + len = sizeof(buf); + return simple_read_from_buffer(user_buf, count, ppos, buf, len); }