Unverified Commit 0d0f659b authored by Tetsuo Handa's avatar Tetsuo Handa Committed by Konstantin Komarov
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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: default avatarsyzot <syzbot+fa4648a5446460b7b963@syzkaller.appspotmail.com>
Signed-off-by: default avatarTetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: default avatarKonstantin Komarov <almaz.alexandrovich@paragon-software.com>
parent 557d1967

fs/ntfs3/bitmap.c

+1 −1
Original line number Diff line number Diff line
@@ -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;