linux-kernel - Re: [syzbot] [kernel?] KASAN: slab-out-of-bounds Read in __futex_pivot

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Message-ID: <tencent_BEF362E363C960C3BD0448D77DF76066D105@qq.com>
Date: Mon,  2 Jun 2025 10:59:45 +0800
From: Edward Adam Davis <eadavis@...com>
To: syzbot+0a5079ee014f4b907817@...kaller.appspotmail.com
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [kernel?] KASAN: slab-out-of-bounds Read in __futex_pivot_hash

#syz test

diff --git a/kernel/futex/core.c b/kernel/futex/core.c
index 19a2c65f3d37..ea6b8266efb9 100644
--- a/kernel/futex/core.c
+++ b/kernel/futex/core.c
@@ -1754,7 +1754,10 @@ int futex_hash_prctl(unsigned long arg2, unsigned long arg3, unsigned long arg4)
 			return -EINVAL;
 		if (arg4 & FH_FLAG_IMMUTABLE)
 			flags |= FH_IMMUTABLE;
+		DEFINE_MUTEX(fha_syn);
+		mutex_lock(&fha_syn);
 		ret = futex_hash_allocate(arg3, flags);
+		mutex_unlock(&fha_syn);
 		break;
 
 	case PR_FUTEX_HASH_GET_SLOTS: