[PATCH v21 02/30] splice: Make filemap_splice_read() check s_maxbytes

David Howells
2023-05-20T00:01:09Z

Make filemap_splice_read() check s_maxbytes analogously to filemap_read().

Signed-off-by: David Howells <dhowells@redhat.com>
cc: Christoph Hellwig <hch@lst.de>
cc: Steve French <stfrench@microsoft.com>
cc: Jens Axboe <axboe@kernel.dk>
cc: Al Viro <viro@zeniv.linux.org.uk>
cc: David Hildenbrand <david@redhat.com>
cc: John Hubbard <jhubbard@nvidia.com>
cc: linux-mm@kvack.org
cc: linux-block@vger.kernel.org
cc: linux-fsdevel@vger.kernel.org
---
mm/filemap.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/mm/filemap.c b/mm/filemap.c
index a2006936a6ae..0fcb0b80c2e2 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -2887,6 +2887,9 @@ ssize_t filemap_splice_read(struct file *in, loff_t *ppos,
bool writably_mapped;
int i, error = 0;

+ if (unlikely(*ppos >= in->f_mapping->host->i_sb->s_maxbytes))
+ return 0;
+
init_sync_kiocb(&iocb, in);
iocb.ki_pos = *ppos;