From 1941d7bcb474aa38caca16e6d3416e623d37d800 Mon Sep 17 00:00:00 2001 From: Sheng Yong Date: Wed, 8 Mar 2017 10:47:12 +0800 Subject: f2fs: check range before defragment This patch checks the parameter range passed by ioctl to void that range exceeds the max_file_blocks limit. Signed-off-by: Sheng Yong Reviewed-by: Chao Yu Signed-off-by: Jaegeuk Kim --- fs/f2fs/file.c | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'fs/f2fs/file.c') diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c index 427ab1b41de3..300d62015c24 100644 --- a/fs/f2fs/file.c +++ b/fs/f2fs/file.c @@ -2054,6 +2054,12 @@ static int f2fs_ioc_defragment(struct file *filp, unsigned long arg) goto out; } + if (unlikely((range.start + range.len) >> PAGE_SHIFT > + sbi->max_file_blocks)) { + err = -EINVAL; + goto out; + } + err = f2fs_defragment_range(sbi, filp, &range); f2fs_update_time(sbi, REQ_TIME); if (err < 0) -- cgit v1.2.3