[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <000000000000f929b3061e950fce@google.com>
Date: Wed, 31 Jul 2024 18:23:47 -0700
From: syzbot <syzbot+24ac24ff58dc5b0d26b9@...kaller.appspotmail.com>
To: linux-kernel@...r.kernel.org
Subject: Re: [syzbot] Re: [syzbot] [squashfs?] KMSAN: uninit-value in pick_link
For archival purposes, forwarding an incoming command email to
linux-kernel@...r.kernel.org.
***
Subject: Re: [syzbot] [squashfs?] KMSAN: uninit-value in pick_link
Author: lizhi.xu@...driver.com
if alloc new folio for filemap, init mem to zero
#syz test: upstream 2f8c4f506285
diff --git a/mm/filemap.c b/mm/filemap.c
index 657bcd887fdb..1b22eab691e8 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -3753,6 +3753,11 @@ static struct folio *do_read_cache_folio(struct address_space *mapping,
folio = filemap_alloc_folio(gfp, 0);
if (!folio)
return ERR_PTR(-ENOMEM);
+
+ void *kaddr = kmap_local_folio(folio, 0);
+ memset(kaddr, 0, folio_size(folio));
+ kunmap_local(kaddr);
+
err = filemap_add_folio(mapping, folio, index, gfp);
if (unlikely(err)) {
folio_put(folio);
Powered by blists - more mailing lists