linux-kernel - Re: [syzbot] Re: [syzbot] [jfs?] UBSAN: array-index-out-of-bounds in dtDelete

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Message-ID: <6801c645.050a0220.243d89.0016.GAE@google.com>
Date: Thu, 17 Apr 2025 20:25:57 -0700
From: syzbot <syzbot+4f9c823a6f63d87491ba@...kaller.appspotmail.com>
To: linux-kernel@...r.kernel.org
Subject: Re: [syzbot] Re: [syzbot] [jfs?] UBSAN: array-index-out-of-bounds in dtDelete

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Subject: Re: [syzbot] [jfs?] UBSAN: array-index-out-of-bounds in dtDelete
Author: richard120310@...il.com

#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git e3a854b577cb

Signed-off-by: I Hsin Cheng <richard120310@...il.com>
---
 fs/jfs/jfs_dtree.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/jfs/jfs_dtree.c b/fs/jfs/jfs_dtree.c
index 8f85177f284b..0a209b30686a 100644
--- a/fs/jfs/jfs_dtree.c
+++ b/fs/jfs/jfs_dtree.c
@@ -2130,7 +2130,7 @@ int dtDelete(tid_t tid,
 					stbl = DT_GETSTBL(np);
 					ldtentry =
 					    (struct ldtentry *) & np->
-					    slot[stbl[0]];
+					    slot[stbl[0] % np->header.maxslot];
 					next_index =
 					    le32_to_cpu(ldtentry->index);
 					DT_PUTPAGE(nmp);
-- 
2.43.0