Re: [PATCH v14 08/17] splice: Do splice read from a file without using ITER_PIPE

[David Howells]

Does the attached fix the problem for you?  The data being written into the
pipe needs to be limited to the size of the file.

David

diff --git a/mm/filemap.c b/mm/filemap.c
index c01bbcb9fa92..6362ac697a70 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -2948,7 +2948,8 @@ ssize_t filemap_splice_read(struct file *in, loff_t *ppos,
 			if (writably_mapped)
 				flush_dcache_folio(folio);
 
-			n = splice_folio_into_pipe(pipe, folio, *ppos, len);
+			n = min_t(loff_t, len, isize - *ppos);
+			n = splice_folio_into_pipe(pipe, folio, *ppos, n);
 			if (!n)
 				goto out;
 			len -= n;