When we try to truncate read count in generic_file_buffered_read(), should deliver (sb->s_maxbytes - offset) as maximum count not sb->s_maxbytes itself. Signed-off-by: Chengguang Xu <cgxu519@xxxxxxx> --- mm/filemap.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/filemap.c b/mm/filemap.c index 52517f28e6f4..5c2d481d21cf 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -2064,7 +2064,7 @@ static ssize_t generic_file_buffered_read(struct kiocb *iocb, if (unlikely(*ppos >= inode->i_sb->s_maxbytes)) return 0; - iov_iter_truncate(iter, inode->i_sb->s_maxbytes); + iov_iter_truncate(iter, inode->i_sb->s_maxbytes - *ppos); index = *ppos >> PAGE_SHIFT; prev_index = ra->prev_pos >> PAGE_SHIFT; -- 2.17.1
