From: Dan Carpenter <error27@gmail.com>
To: "Luis R. Rodriguez" <lrodriguez@atheros.com>
Cc: Nick Kossifidis <mickflemm@gmail.com>,
Jiri Slaby <jirislaby@gmail.com>,
Bob Copeland <me@bobcopeland.com>,
"John W. Linville" <linville@tuxdriver.com>,
Bruno Randolf <br1@einfach.org>,
linux-wireless@vger.kernel.org, ath5k-devel@lists.ath5k.org,
kernel-janitors@vger.kernel.org
Subject: [patch -next] ath5k: snprintf() returns largish values
Date: Thu, 22 Jul 2010 10:52:02 +0200 [thread overview]
Message-ID: <20100722085202.GV17585@bicker> (raw)
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 <error27@gmail.com>
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);
}
next reply other threads:[~2010-07-22 8:52 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-07-22 8:52 Dan Carpenter [this message]
2010-07-22 8:56 ` [patch -next] ath5k: snprintf() returns largish values Jiri Slaby
2010-07-22 10:44 ` Dan Carpenter
2010-07-23 8:44 ` Bruno Randolf
2010-07-23 10:04 ` Dan Carpenter
2010-07-23 17:48 ` Joe Perches
2010-07-23 19:21 ` Linus Torvalds
2010-07-23 16:11 ` walter harms
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