do_splice_to(): cap the size before passing to ->splice_read()

pipe capacity won't exceed 2G anyway.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

diff --git a/fs/splice.c b/fs/splice.c
index 9947b5c696649a20cf4064883efc89ae26a81b78..a6b87b7e0745534048549d5b6c65666ffd961a02 100644 (file)
--- a/fs/splice.c
+++ b/fs/splice.c
@@ -1143,6 +1143,9 @@ static long do_splice_to(struct file *in, loff_t *ppos,
        if (unlikely(ret < 0))
                return ret;
 
+       if (unlikely(len > MAX_RW_COUNT))
+               len = MAX_RW_COUNT;
+
        if (in->f_op->splice_read)
                splice_read = in->f_op->splice_read;
        else