netfs: Fix a KMSAN uninit-value error in netfs_clear_buffer

Use folioq_count instead of folioq_nr_slots to fix a KMSAN uninit-value
error in netfs_clear_buffer

Signed-off-by: Chang Yu <marcus.yu.56@gmail.com>
Link: https://lore.kernel.org/r/ZvuXWC2bYpvQsWgS@gmail.com
Fixes: cd0277ed0c18 ("netfs: Use new folio_queue data type and iterator instead of xarray iter")
Acked-by: David Howells <dhowells@redhat.com>
Reported-by: syzbot+921873345a95f4dae7e9@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=921873345a95f4dae7e9
Signed-off-by: Christian Brauner <brauner@kernel.org>

diff --git a/fs/netfs/misc.c b/fs/netfs/misc.c
index 63280791de3b3882b1187456566705b996275ddc..78fe5796b2b2f7fc31547ae2ae6b2d686cc3a111 100644 (file)
--- a/fs/netfs/misc.c
+++ b/fs/netfs/misc.c
@@ -102,7 +102,7 @@ void netfs_clear_buffer(struct netfs_io_request *rreq)
 
        while ((p = rreq->buffer)) {
                rreq->buffer = p->next;
-               for (int slot = 0; slot < folioq_nr_slots(p); slot++) {
+               for (int slot = 0; slot < folioq_count(p); slot++) {
                        struct folio *folio = folioq_folio(p, slot);
                        if (!folio)
                                continue;