From 3c4177716cd2e452229dd0b7c25d192c48c1e7ac Mon Sep 17 00:00:00 2001 From: chas williams - CONTRACTOR Date: Mon, 17 Dec 2012 06:00:01 +0000 Subject: [PATCH] atm: use scnprintf() instead of sprintf() As reported by Chen Gang , we should ensure there is enough space when formatting the sysfs buffers. Signed-off-by: Chas Williams Signed-off-by: David S. Miller --- net/atm/atm_sysfs.c | 40 +++++++++++++++------------------------- 1 file changed, 15 insertions(+), 25 deletions(-) diff --git a/net/atm/atm_sysfs.c b/net/atm/atm_sysfs.c index f49da5814bc3..350bf62b2ae3 100644 --- a/net/atm/atm_sysfs.c +++ b/net/atm/atm_sysfs.c @@ -14,49 +14,45 @@ static ssize_t show_type(struct device *cdev, struct device_attribute *attr, char *buf) { struct atm_dev *adev = to_atm_dev(cdev); - return sprintf(buf, "%s\n", adev->type); + + return scnprintf(buf, PAGE_SIZE, "%s\n", adev->type); } static ssize_t show_address(struct device *cdev, struct device_attribute *attr, char *buf) { - char *pos = buf; struct atm_dev *adev = to_atm_dev(cdev); - int i; - - for (i = 0; i < (ESI_LEN - 1); i++) - pos += sprintf(pos, "%02x:", adev->esi[i]); - pos += sprintf(pos, "%02x\n", adev->esi[i]); - return pos - buf; + return scnprintf(buf, PAGE_SIZE, "%pM\n", adev->esi); } static ssize_t show_atmaddress(struct device *cdev, struct device_attribute *attr, char *buf) { unsigned long flags; - char *pos = buf; struct atm_dev *adev = to_atm_dev(cdev); struct atm_dev_addr *aaddr; int bin[] = { 1, 2, 10, 6, 1 }, *fmt = bin; - int i, j; + int i, j, count = 0; spin_lock_irqsave(&adev->lock, flags); list_for_each_entry(aaddr, &adev->local, entry) { for (i = 0, j = 0; i < ATM_ESA_LEN; ++i, ++j) { if (j == *fmt) { - pos += sprintf(pos, "."); + count += scnprintf(buf + count, + PAGE_SIZE - count, "."); ++fmt; j = 0; } - pos += sprintf(pos, "%02x", - aaddr->addr.sas_addr.prv[i]); + count += scnprintf(buf + count, + PAGE_SIZE - count, "%02x", + aaddr->addr.sas_addr.prv[i]); } - pos += sprintf(pos, "\n"); + count += scnprintf(buf + count, PAGE_SIZE - count, "\n"); } spin_unlock_irqrestore(&adev->lock, flags); - return pos - buf; + return count; } static ssize_t show_atmindex(struct device *cdev, @@ -64,25 +60,21 @@ static ssize_t show_atmindex(struct device *cdev, { struct atm_dev *adev = to_atm_dev(cdev); - return sprintf(buf, "%d\n", adev->number); + return scnprintf(buf, PAGE_SIZE, "%d\n", adev->number); } static ssize_t show_carrier(struct device *cdev, struct device_attribute *attr, char *buf) { - char *pos = buf; struct atm_dev *adev = to_atm_dev(cdev); - pos += sprintf(pos, "%d\n", - adev->signal == ATM_PHY_SIG_LOST ? 0 : 1); - - return pos - buf; + return scnprintf(buf, PAGE_SIZE, "%d\n", + adev->signal == ATM_PHY_SIG_LOST ? 0 : 1); } static ssize_t show_link_rate(struct device *cdev, struct device_attribute *attr, char *buf) { - char *pos = buf; struct atm_dev *adev = to_atm_dev(cdev); int link_rate; @@ -100,9 +92,7 @@ static ssize_t show_link_rate(struct device *cdev, default: link_rate = adev->link_rate * 8 * 53; } - pos += sprintf(pos, "%d\n", link_rate); - - return pos - buf; + return scnprintf(buf, PAGE_SIZE, "%d\n", link_rate); } static DEVICE_ATTR(address, S_IRUGO, show_address, NULL); -- 2.20.1