linux-kernel - Re: [syzbot] Re: [syzbot] [bcachefs?] KASAN: slab-out-of-bounds Write in bch2_dev_journal

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Message-ID: <000000000000f2f6290620008a5b@google.com>
Date: Sun, 18 Aug 2024 20:02:43 -0700
From: syzbot <syzbot+47ecc948aadfb2ab3efc@...kaller.appspotmail.com>
To: linux-kernel@...r.kernel.org
Subject: Re: [syzbot] Re: [syzbot] [bcachefs?] KASAN: slab-out-of-bounds Write
 in bch2_dev_journal_init

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Subject: Re: [syzbot] [bcachefs?] KASAN: slab-out-of-bounds Write in bch2_dev_journal_init
Author: lizhi.xu@...driver.com

unsigned may overflow

#syz test: upstream c3f2d783a459

diff --git a/fs/bcachefs/journal_types.h b/fs/bcachefs/journal_types.h
index 19183fcf7ad7..311a62a0f6c1 100644
--- a/fs/bcachefs/journal_types.h
+++ b/fs/bcachefs/journal_types.h
@@ -323,7 +323,7 @@ struct journal_device {
 	unsigned		dirty_idx_ondisk;
 	unsigned		dirty_idx;
 	unsigned		cur_idx;		/* Journal bucket we're currently writing to */
-	unsigned		nr;
+	u64			nr;
 
 	u64			*buckets;