From patchwork Thu Dec 28 07:24:09 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 13505651 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (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 33C0563A8 for ; Thu, 28 Dec 2023 07:24:16 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=bombadil.srs.infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="FInXzmiJ" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=Content-Transfer-Encoding: MIME-Version:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To:Content-Type: Content-ID:Content-Description:In-Reply-To:References; bh=zUGAB3khcb2EqUcWbrO+QdDyA2Zx5YkVOEYqFUSWCkI=; b=FInXzmiJVWD1JMynSQcaD5dToF gDJ/0tSvrMC7kvT44gwEWk4YlL53z5yOT22RHux81d4UVXLdCTfcXeHV1WWK0nfuSSnqND40PlcWY 8y2OVkGih8Gjr0FH2eEiP9bWV2UDMcOmw/rG2N6cND7tvlM+Nj8mfGbHEoQ4bPnrLoQB3NU5JDlNG 4XyPyr+2SkQ0CzH6zqp7iiPvv9dbDUPIoi/4QSYANh8U748sl4IzXHsl7RC3o/4jCRvHkD3wIT6Qb P9208G3PwDJ1JMjuYn+goypBOme0ivLo6GIYiLgJNkooN23s0u1h57lmzJ6AdtnC2Kr6hSnsJkpi5 3drBYwgQ==; Received: from 128.red-83-57-75.dynamicip.rima-tde.net ([83.57.75.128] helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.96 #2 (Red Hat Linux)) id 1rIkkX-00GKit-1l; Thu, 28 Dec 2023 07:24:14 +0000 From: Christoph Hellwig To: chandan.babu@oracle.com Cc: djwong@kernel.org, linux-xfs@vger.kernel.org, kernel test robot Subject: [PATCH v2 1/2] xfs: fix a use after free in xfs_defer_finish_recovery Date: Thu, 28 Dec 2023 07:24:09 +0000 Message-Id: <20231228072410.359908-1-hch@lst.de> X-Mailer: git-send-email 2.39.2 Precedence: bulk X-Mailing-List: linux-xfs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html dfp will be freed by ->recover_work and thus the tracepoint in case of an error can lead to a use after free. Store the defer ops in a local variable to avoid that. Fixes: 7f2f7531e0d4 ("xfs: store an ops pointer in struct xfs_defer_pending") Reported-by: kernel test robot Signed-off-by: Christoph Hellwig Reviewed-by: Darrick J. Wong --- - add a comment fs/xfs/libxfs/xfs_defer.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/fs/xfs/libxfs/xfs_defer.c b/fs/xfs/libxfs/xfs_defer.c index ca7f0ac0489604..75c5b3a2c2cba4 100644 --- a/fs/xfs/libxfs/xfs_defer.c +++ b/fs/xfs/libxfs/xfs_defer.c @@ -915,12 +915,14 @@ xfs_defer_finish_recovery( struct xfs_defer_pending *dfp, struct list_head *capture_list) { + const struct xfs_defer_op_type *ops = dfp->dfp_ops; int error; - error = dfp->dfp_ops->recover_work(dfp, capture_list); + /* dfp is freed by recover_work and must not be accessed afterwards */ + error = ops->recover_work(dfp, capture_list); if (error) trace_xlog_intent_recovery_failed(mp, error, - dfp->dfp_ops->recover_work); + ops->recover_work); return error; }