From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp153-165.sina.com.cn (smtp153-165.sina.com.cn [61.135.153.165]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 09F1E35503A for ; Wed, 11 Feb 2026 09:25:01 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=61.135.153.165 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770801908; cv=none; b=lXWvunKiCVPu3x5kAitr6Usmi0nCcc80x2yNIXRKXdkcqdrfGst/QyzuJ4bi5/rWcY4d/hGT9afkdxtiIERgs77Z1WLItQJRi9N3K0Y4aqfmobuX1tpRtyId0gci+Zu+Z/gbyU401T3oWkVX3RHkPzq99JEhTao3riuAJoNI/vk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770801908; c=relaxed/simple; bh=/uh1tD2RJqYZamlZ76F7DQCwKLjpDb0FezwWrJUARUk=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=R5XSkv6s/wu4Dcj9Z7H4ZCXiunwDHVcWMmZ3ybCKMu8GLSf7sEIqgxkDTJYk4QYW189azefSgg33K1uL3s43f2u5+xaof7PkLN0U+Mhni6u5fuFNq462oi+fLGdNZVNdjoOCF9vDIUxr3z7Gg4wvxRWlUznsHZyYiFkXBTRvWek= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=sina.com; spf=pass smtp.mailfrom=sina.com; dkim=pass (1024-bit key) header.d=sina.com header.i=@sina.com header.b=Ceo01L5Z; arc=none smtp.client-ip=61.135.153.165 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=sina.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=sina.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=sina.com header.i=@sina.com header.b="Ceo01L5Z" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sina.com; s=201208; t=1770801902; bh=w/akR3UaVziImVT8xREWe6ZrNn559C9VfeRN80UdT1g=; h=From:Subject:Date:Message-ID; b=Ceo01L5ZHEjYBlbKaa33zgSHSZ5m8fJ8CwZ8XEqalvfdM4JiK5jd9scDTHyX10KOO o1AJu9LOzpNrkJA7VtmTd51HK17Im5bruKQSTw+wui2aSvCaptctiv7RMCWcwi3Q9Y K90OwT0hMGCtg8xC4m19agUAnwUJVWZMK/Us0hdU= X-SMAIL-HELO: localhost.localdomain Received: from unknown (HELO localhost.localdomain)([114.249.62.144]) by sina.com (10.54.253.32) with ESMTP id 698C4A5700003184; Wed, 11 Feb 2026 17:22:35 +0800 (CST) X-Sender: hdanton@sina.com X-Auth-ID: hdanton@sina.com Authentication-Results: sina.com; spf=none smtp.mailfrom=hdanton@sina.com; dkim=none header.i=none; dmarc=none action=none header.from=hdanton@sina.com X-SMAIL-MID: 3484904456657 X-SMAIL-UIID: 4ADA36E22D5942C3A0043A7E032904FD-20260211-172235-1 From: Hillf Danton To: syzbot Cc: linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Subject: Re: [syzbot] [kernel?] KASAN: slab-use-after-free Read in futex_unqueue Date: Wed, 11 Feb 2026 17:22:20 +0800 Message-ID: <20260211092221.2915-1-hdanton@sina.com> In-Reply-To: <698ba684.a70a0220.2c38d7.007c.GAE@google.com> References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit > Date: Tue, 10 Feb 2026 13:43:32 -0800 [thread overview] > Hello, > > syzbot found the following issue on: > > HEAD commit: 72c395024dac Merge tag 'docs-7.0' of git://git.kernel.org/.. > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=137d9b22580000 > kernel config: https://syzkaller.appspot.com/x/.config?x=bf83be18dae53c93 > dashboard link: https://syzkaller.appspot.com/bug?extid=6c1861115b4253e45969 > compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=169f8ae6580000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17f657fa580000 #syz test --- x/fs/proc/task_mmu.c +++ y/fs/proc/task_mmu.c @@ -780,7 +780,7 @@ static int do_procmap_query(struct mm_st } else { if (karg.build_id_size < build_id_sz) { err = -ENAMETOOLONG; - goto out; + goto out_file; } karg.build_id_size = build_id_sz; } @@ -808,6 +808,7 @@ static int do_procmap_query(struct mm_st out: query_vma_teardown(&lock_ctx); mmput(mm); +out_file: if (vm_file) fput(vm_file); kfree(name_buf); --