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Message-ID: <000000000000616c0e061e9bd272@google.com>
Date: Thu, 01 Aug 2024 02:27:38 -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
why folio not inited?
#syz test: upstream 2f8c4f506285
diff --git a/mm/filemap.c b/mm/filemap.c
index 657bcd887fdb..b76a13395299 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -3754,11 +3754,15 @@ static struct folio *do_read_cache_folio(struct address_space *mapping,
if (!folio)
return ERR_PTR(-ENOMEM);
err = filemap_add_folio(mapping, folio, index, gfp);
+ printk("err: %d, folio: %p, in: %p, %s\n", err, folio, mapping->host, __func__);
if (unlikely(err)) {
folio_put(folio);
if (err == -EEXIST)
goto repeat;
/* Presumably ENOMEM for xarray node */
+ void *kaddr = kmap_local_folio(folio, 0);
+ memset(kaddr, 0, folio_size(folio));
+ kunmap_local(kaddr);
return ERR_PTR(err);
}
@@ -3791,6 +3795,7 @@ static struct folio *do_read_cache_folio(struct address_space *mapping,
folio_put(folio);
if (err == AOP_TRUNCATED_PAGE)
goto repeat;
+ printk("err: %d, folio: %p, %s\n", err, folio, __func__);
return ERR_PTR(err);
}
diff --git a/fs/namei.c b/fs/namei.c
index 3a4c40e12f78..3f72aa8d604d 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -5272,6 +5272,8 @@ const char *page_get_link(struct dentry *dentry, struct inode *inode,
page = read_mapping_page(mapping, 0, NULL);
if (IS_ERR(page))
return (char*)page;
+ else if (IS_ERR(page_folio(page)))
+ return (char*)page_folio(page);
}
set_delayed_call(callback, page_put_link, page);
BUG_ON(mapping_gfp_mask(mapping) & __GFP_HIGHMEM);
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