From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=82.195.75.108 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1793983405; b=yB5usYDMZgPlpLMmmnd+EqOAHLS2YqD+62xfP7DA/NuKZtLNSf+5McaQozBuZtAYZVJf c6qcCXuB6LN7dmcf3HwYcdSwXA/GWL5yrablGKaKku/0iZIb3xLv2kyG2wUQYefnh8b82 dmNRDm6ddFhzv6YOm7vXAoLEMWsiJx5cuHb+KjDL91yU8FCZHq8H5rkH969YtAmXHPkx1 cqJytoc2Ik9JkYyq/rzXy18E0k03ynAe2d6MjKUZOQUvJwdsKaxM2aNngEH/S47v3amqa IlqnNHUd6VvENNR89QrSZn9X0Kw3mRSKrUOvC2KoY3ZCoumroz1Z/K2h7xbGeazlB2w== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793983405; h=DMARC-Filter:DKIM-Signature:Received:Date:From:To:Cc:Subject: Message-ID:References:MIME-Version:Content-Type:Content-Disposition: In-Reply-To:X-Debian-User; bh=AKgfRWqpa4rK9V349FW23FUgQBz7Hu0ElZJb17dx9DY=; b=PIcYfYuXqupgH57eiknFUjXGyMdxFtb5plkklKVuaNBvvTRT2p5yWrLVgQs2A1l8i/wI DwRprvLPWkR+gVTibBr63n00GE90YxlzgdDLGnXyuNQso6FcgKqDvdSOxR1PTeR1xw7Vx Yr3De0tgMq52xoBklOXiPIHdZGRLL7Y9U9s+8iDXVguBoEg895MMULylCzcOOlIet6MuZ 32AhAdt8ZNv6xyMPZOUpjXF6OWEcB74Hp9wnZggP1ivyxlH3zpDeZXT1lxQDFs6jyG259 QdVxjick8CQnf++tK1YeV0IkydJGWb9L5gqgCxxKgnJkXhKtJuTAn/0KG6i/YuW+JCg== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass header.from=debian.org; spf=pass smtp.mailfrom=debian.org; dkim=pass header.d=debian.org header.i=@debian.org header.a=rsa-sha256 header.s=smtpauto.stravinsky header.b=mQfKAn9f; arc=none smtp.remote-ip=82.195.75.108 Received: from stravinsky.debian.org (stravinsky.debian.org [82.195.75.108]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange ECDHE (prime256v1) server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 987FB606A329; Fri, 6 Nov 2026 16:43:24 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.2 smtp.subspace.kernel.org 987FB606A329 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=debian.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=debian.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key, unprotected) header.d=debian.org header.i=@debian.org header.a=rsa-sha256 header.s=smtpauto.stravinsky header.b=mQfKAn9f DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=debian.org; s=smtpauto.stravinsky; h=X-Debian-User:In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=AKgfRWqpa4rK9V349FW23FUgQBz7Hu0ElZJb17dx9DY=; b=mQfKAn9f4rTREvupKtVQkzEJZY rIcsvKh75/OlxsOlXmhFfFqNod98WDPB3l6iksRxJ7/BGYB7ehTx8FesG6JRUzV5QPC/EBWVunKHU ErvyUVfmfpb4mKzZtU6jvZYUwahAJ15ynaoxy7/+Dz0YcuKiXLuX12z924UC7RbUy8gwWtMkoAqwV dyVplN5mMwcUg+V+694Jslnmz5dPzKMV/YXsRKv1H74TfStMvOAfYCYqnEnJ5A6XZm/KpQbDTxMNW gc7xki4F9IyQAzqhdbOi3Fpbb33SbgbtDgDe4Z1XiYnzO9i512P6xsxVj18+GSGs4FARS3TDZktdB YmrvmEMw==; Received: from authenticated-user by stravinsky.debian.org with esmtpsa (TLS1.3:ECDHE_X25519__RSA_PSS_RSAE_SHA256__AES_256_GCM:256) (Exim 4.96) (envelope-from ) id 1xPN1y-009QCp-0g; Fri, 06 Nov 2026 16:43:10 +0000 Date: Fri, 6 Nov 2026 08:43:05 -0800 From: Breno Leitao To: Drif Abdelmalek Mohamed Said Cc: Andreas Hindborg , Al Viro , Christian Brauner , Jan Kara , linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com, syzbot+63336d70e1af377d7388@syzkaller.appspotmail.com, Ran Hongyun Subject: Re: [PATCH v3] configfs: fix slab-UAF Write in config_item_put Message-ID: References: <20261105165055.362-1-drifabdelmalekmohamedsaid@gmail.com> X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20261105165055.362-1-drifabdelmalekmohamedsaid@gmail.com> X-Debian-User: leitao On Thu, Nov 05, 2026 at 05:50:54PM +0100, Drif Abdelmalek Mohamed Said wrote: > --- > v3: > - Removed redundant null assignment to parent_item It wasn't redundant, see below. > > + if (IS_DEADDIR(dir)) { > + ret = -ENOENT; > + goto out_put_target; > + } I am seeing the following when running this version: refcount_t: addition on 0; use-after-free. WARNING: lib/refcount.c:34 at refcount_warn_saturate+0x76/0xd0, CPU#1: ln/172 Call Trace: Can you help me to understand how this was tested? Thanks, --breno