From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 56227CCA473 for ; Wed, 1 Jun 2022 14:11:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1355129AbiFAOLo (ORCPT ); Wed, 1 Jun 2022 10:11:44 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50616 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1354650AbiFAOJg (ORCPT ); Wed, 1 Jun 2022 10:09:36 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1DC4FD11B; Wed, 1 Jun 2022 07:01:06 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id C33A4B8175B; Wed, 1 Jun 2022 14:01:04 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7368AC385A5; Wed, 1 Jun 2022 14:01:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1654092063; bh=LZSVzGm+eApsXK45dI2BFu9jzJnYL96WdCNobNzk1qI=; h=From:To:Cc:Subject:Date:From; b=DmVt2KgdLDzTBOBEltgu0qcN9lXQCBXIzW581N9PB2DiS8ngZOpIncmwvaSFJCBeg FbWwVhkFCKsNLQGOjWemQWNAInWbzcC8YW+yXAzlcTbCJQDE+4A/2ZQeMhUQMxNWax Q8/nXHyE5Od7CZgjw7Zbt8KL1FJG0KTiF6pFrJesyVaX6Sh1I1ICpTu58L3q6kUOtE PO8ToD4iaZvQHW69j5rTHtdRpLiKYS/ArjqpRhJOK7uncvTVTAv2uZBSJgDaAJnUH4 RE2/gdkz5MjIs31Odm8nXJ+ZzyLpwZS09liWQSaVKMe5Z4nyqwOxiadmZ+Lg/gv+qd LosWNNQZf/Yhg== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Zixuan Fu , TOTE Robot , Dave Kleikamp , Sasha Levin , shaggy@kernel.org, jfs-discussion@lists.sourceforge.net Subject: [PATCH AUTOSEL 4.9 01/11] fs: jfs: fix possible NULL pointer dereference in dbFree() Date: Wed, 1 Jun 2022 10:00:50 -0400 Message-Id: <20220601140100.2005469-1-sashal@kernel.org> X-Mailer: git-send-email 2.35.1 MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Zixuan Fu [ Upstream commit 0d4837fdb796f99369cf7691d33de1b856bcaf1f ] In our fault-injection testing, the variable "nblocks" in dbFree() can be zero when kmalloc_array() fails in dtSearch(). In this case, the variable "mp" in dbFree() would be NULL and then it is dereferenced in "write_metapage(mp)". The failure log is listed as follows: [ 13.824137] BUG: kernel NULL pointer dereference, address: 0000000000000020 ... [ 13.827416] RIP: 0010:dbFree+0x5f7/0x910 [jfs] [ 13.834341] Call Trace: [ 13.834540] [ 13.834713] txFreeMap+0x7b4/0xb10 [jfs] [ 13.835038] txUpdateMap+0x311/0x650 [jfs] [ 13.835375] jfs_lazycommit+0x5f2/0xc70 [jfs] [ 13.835726] ? sched_dynamic_update+0x1b0/0x1b0 [ 13.836092] kthread+0x3c2/0x4a0 [ 13.836355] ? txLockFree+0x160/0x160 [jfs] [ 13.836763] ? kthread_unuse_mm+0x160/0x160 [ 13.837106] ret_from_fork+0x1f/0x30 [ 13.837402] ... This patch adds a NULL check of "mp" before "write_metapage(mp)" is called. Reported-by: TOTE Robot Signed-off-by: Zixuan Fu Signed-off-by: Dave Kleikamp Signed-off-by: Sasha Levin --- fs/jfs/jfs_dmap.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/fs/jfs/jfs_dmap.c b/fs/jfs/jfs_dmap.c index 6dac48e29d28..a07fbb60ac3c 100644 --- a/fs/jfs/jfs_dmap.c +++ b/fs/jfs/jfs_dmap.c @@ -398,7 +398,8 @@ int dbFree(struct inode *ip, s64 blkno, s64 nblocks) } /* write the last buffer. */ - write_metapage(mp); + if (mp) + write_metapage(mp); IREAD_UNLOCK(ipbmap); -- 2.35.1