From: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Date: Sun, 2 Oct 2022 14:39:15 +0000 (+0900)
Subject: fs/ntfs3: Use __GFP_NOWARN allocation at wnd_init()
X-Git-Tag: v6.2-rc1~22^2~35
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0d0f659bf713662fabed973f9996b8f23c59ca51;p=thirdparty%2Fkernel%2Fstable.git

fs/ntfs3: Use __GFP_NOWARN allocation at wnd_init()

syzbot is reporting too large allocation at wnd_init() [1], for a crafted
filesystem can become wnd->nwnd close to UINT_MAX. Add __GFP_NOWARN in
order to avoid too large allocation warning, than exhausting memory by
using kvcalloc().

Link: https://syzkaller.appspot.com/bug?extid=fa4648a5446460b7b963 [1]
Reported-by: syzot <syzbot+fa4648a5446460b7b963@syzkaller.appspotmail.com>
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>
---

diff --git a/fs/ntfs3/bitmap.c b/fs/ntfs3/bitmap.c
index 629c1ee97268a..badaaaf302ddf 100644
--- a/fs/ntfs3/bitmap.c
+++ b/fs/ntfs3/bitmap.c
@@ -661,7 +661,7 @@ int wnd_init(struct wnd_bitmap *wnd, struct super_block *sb, size_t nbits)
 	if (!wnd->bits_last)
 		wnd->bits_last = wbits;
 
-	wnd->free_bits = kcalloc(wnd->nwnd, sizeof(u16), GFP_NOFS);
+	wnd->free_bits = kcalloc(wnd->nwnd, sizeof(u16), GFP_NOFS | __GFP_NOWARN);
 	if (!wnd->free_bits)
 		return -ENOMEM;