From 92b66d2cdd7a4f6f6aa31be5f16a3f0c88902690 Mon Sep 17 00:00:00 2001 From: Miklos Szeredi Date: Fri, 6 Jul 2018 23:57:02 +0200 Subject: vfs: limit size of dedupe Suggested-by: Darrick J. Wong Signed-off-by: Miklos Szeredi --- fs/read_write.c | 3 +++ 1 file changed, 3 insertions(+) (limited to 'fs/read_write.c') diff --git a/fs/read_write.c b/fs/read_write.c index 153f8f690490..f43bb12b4759 100644 --- a/fs/read_write.c +++ b/fs/read_write.c @@ -2003,6 +2003,9 @@ int vfs_dedupe_file_range(struct file *file, struct file_dedupe_range *same) if (off + len > i_size_read(src)) return -EINVAL; + /* Arbitrary 1G limit on a single dedupe request, can be raised. */ + len = min_t(u64, len, 1 << 30); + /* pre-format output fields to sane values */ for (i = 0; i < count; i++) { same->info[i].bytes_deduped = 0ULL; -- cgit v1.2.3-55-g7522