iov_iter: iterate_folioq: fix handling of offset >= folio size

It's apparently possible to get an iov advanced all the way up to the end
of the current page we're looking at, e.g.

(gdb) p *iter
$24 = {iter_type = 4 '\004', nofault = false, data_source = false, iov_offset = 4096, {__ubuf_iovec = {
iov_base = 0xffff88800f5bc000, iov_len = 655}, {{__iov = 0xffff88800f5bc000, kvec = 0xffff88800f5bc000,
bvec = 0xffff88800f5bc000, folioq = 0xffff88800f5bc000, xarray = 0xffff88800f5bc000,
ubuf = 0xffff88800f5bc000}, count = 655}}, {nr_segs = 2, folioq_slot = 2 '\002', xarray_start = 2}}

Where iov_offset is 4k with 4k-sized folios

This should have been fine because we're only in the 2nd slot and there's
another one after this, but iterate_folioq should not try to map a folio
that skips the whole size, and more importantly part here does not end up
zero (because 'PAGE_SIZE - skip % PAGE_SIZE' ends up PAGE_SIZE and not
zero..), so skip forward to the "advance to next folio" code

Link: https://lkml.kernel.org/r/[e-mail]
Link: https://lkml.kernel.org/r/[e-mail]
Signed-off-by: Dominique Martinet <[e-mail]>
Fixes: db0aa2e9566f ("mm: Define struct folio_queue and ITER_FOLIOQ to handle a sequence of folios")
Reported-by: Maximilian Bosch <[e-mail]>
Reported-by: Ryan Lahfa <[e-mail]>
Reported-by: Christian Theune <[e-mail]>
Reported-by: Arnout Engelen <[e-mail]>
Link: https://lkml.kernel.org/r/[e-mail]/
Acked-by: David Howells <[e-mail]>
Cc: Al Viro <[e-mail]>
Cc: Christian Brauner <[e-mail]>
Cc: Matthew Wilcox (Oracle) <[e-mail]>
Cc: <[e-mail]> [6.12+]
Signed-off-by: Andrew Morton <[e-mail]>

include/linux/iov_iter.h

···
 
 	do {
 		struct folio *folio = folioq_folio(folioq, slot);
-		size_t part, remain, consumed;
+		size_t part, remain = 0, consumed;
 		size_t fsize;
 		void *base;
 
···
 			break;
 
 		fsize = folioq_folio_size(folioq, slot);
-		base = kmap_local_folio(folio, skip);
-		part = umin(len, PAGE_SIZE - skip % PAGE_SIZE);
-		remain = step(base, progress, part, priv, priv2);
-		kunmap_local(base);
-		consumed = part - remain;
-		len -= consumed;
-		progress += consumed;
-		skip += consumed;
+		if (skip < fsize) {
+			base = kmap_local_folio(folio, skip);
+			part = umin(len, PAGE_SIZE - skip % PAGE_SIZE);
+			remain = step(base, progress, part, priv, priv2);
+			kunmap_local(base);
+			consumed = part - remain;
+			len -= consumed;
+			progress += consumed;
+			skip += consumed;
+		}
 		if (skip >= fsize) {
 			skip = 0;
 			slot++;