From d293d3af2dee0c5f5d41b41ff0a0b091b2c45db8 Mon Sep 17 00:00:00 2001 From: Takashi Iwai Date: Wed, 1 Apr 2020 21:04:05 -0700 Subject: ocfs2: use scnprintf() for avoiding potential buffer overflow 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(). Signed-off-by: Takashi Iwai Signed-off-by: Andrew Morton Acked-by: Joseph Qi Cc: Mark Fasheh Cc: Joel Becker Cc: Joseph Qi Cc: Changwei Ge Cc: Gang He Cc: Jun Piao Link: http://lkml.kernel.org/r/20200311093516.25300-1-tiwai@suse.de Signed-off-by: Linus Torvalds --- fs/ocfs2/cluster/heartbeat.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) (limited to 'fs/ocfs2/cluster/heartbeat.c') diff --git a/fs/ocfs2/cluster/heartbeat.c b/fs/ocfs2/cluster/heartbeat.c index 78cb48d6a596..89d13e0705fe 100644 --- a/fs/ocfs2/cluster/heartbeat.c +++ b/fs/ocfs2/cluster/heartbeat.c @@ -1307,7 +1307,7 @@ static int o2hb_debug_open(struct inode *inode, struct file *file) case O2HB_DB_TYPE_REGION_NUMBER: reg = (struct o2hb_region *)db->db_data; - out += snprintf(buf + out, PAGE_SIZE - out, "%d\n", + out += scnprintf(buf + out, PAGE_SIZE - out, "%d\n", reg->hr_region_num); goto done; @@ -1317,12 +1317,12 @@ static int o2hb_debug_open(struct inode *inode, struct file *file) /* If 0, it has never been set before */ if (lts) lts = jiffies_to_msecs(jiffies - lts); - out += snprintf(buf + out, PAGE_SIZE - out, "%lu\n", lts); + out += scnprintf(buf + out, PAGE_SIZE - out, "%lu\n", lts); goto done; case O2HB_DB_TYPE_REGION_PINNED: reg = (struct o2hb_region *)db->db_data; - out += snprintf(buf + out, PAGE_SIZE - out, "%u\n", + out += scnprintf(buf + out, PAGE_SIZE - out, "%u\n", !!reg->hr_item_pinned); goto done; @@ -1331,8 +1331,8 @@ static int o2hb_debug_open(struct inode *inode, struct file *file) } while ((i = find_next_bit(map, db->db_len, i + 1)) < db->db_len) - out += snprintf(buf + out, PAGE_SIZE - out, "%d ", i); - out += snprintf(buf + out, PAGE_SIZE - out, "\n"); + out += scnprintf(buf + out, PAGE_SIZE - out, "%d ", i); + out += scnprintf(buf + out, PAGE_SIZE - out, "\n"); done: i_size_write(inode, out); -- cgit v1.2.3-59-g8ed1b