From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 DD1EC38944D; Wed, 30 Sep 2026 17:04:13 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790787855; cv=none; b=Isflnq2i0i04yk6ls5Vnmg3AkF9B5Lk7pKpZa0Bk8Db73LmwKDYZqRYNUCG4D5GjNgJ5SPS5l17qOyMaAab8aT0Qff9CxPDHlrrhyltwJDhcFWPpVUSvAG1WdKgcSXKVuOLiIFZdUBvvx6kDHlV1ZygiU8vrC5rRiyh+oBF3CFA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790787855; c=relaxed/simple; bh=lNhKLbpRhvoVJCfkMe6T8OA1ZMpvXz4UEXZmyvxuEsc=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=ERz9KFLREfdS6HABscxOvedAQ0AEZVnQFbFq9MmLgfTW7C3z4DspQBCHTvzHh4W02/IP/TYZdlXZMb1sI+uD6tO2hHaznuldpUphxkgqLyv0rvfe5+I+Zq/d+cCKgxJb9ps0WkOn7gWzmOS0c9EehlHnq7mQjfie5Ld3mvBs8dM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=eNzF+ro4; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="eNzF+ro4" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 419D21F000FF; Wed, 30 Sep 2026 17:04:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1790787853; bh=Ys85ge+TJXRH+RtC1eYHDTQ+pXI/BZpC9Q9dXyzAhDM=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=eNzF+ro4OzQQ9SnLPj5E4TWWVCF8E8ZBTSfbwiAxVazjuln9GRON2rxJENCwJNgEa GEzeVw+ZYHrbwkQ+Et5i8nI8XTZtUKObKRZeuJUqsuVofXruEKf0L8X1lRctdB+QYD EuR8AxN3Yc7Od1Nh6yOKoP0+fxbAGvonH8lxBn/0= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Vineeth Vijayan , Peter Oberparleiter , Heiko Carstens Subject: [PATCH 7.2 376/457] s390/cio: Fix NULL pointer dereference in ccw_device_get_util_str() Date: Wed, 30 Sep 2026 17:28:01 +0200 Message-ID: <20260930152354.119495939@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260930152346.024115587@linuxfoundation.org> References: <20260930152346.024115587@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 7.2-stable review patch. If anyone has any objections, please let me know. ------------------ From: Vineeth Vijayan commit 5b76268dac968612f7283d59b539036de955b7d9 upstream. The channel path registry entry associated with a CHPID may be removed while the subchannel's PMCW still references that CHPID. In this case, chpid_to_chp() can return NULL, leading to a NULL pointer dereference. Add the missing NULL check before dereferencing the returned pointer. Fixes: 199652309a4d ("s390/cio: add helper to query utility strings per given ccw device") Cc: stable@vger.kernel.org Signed-off-by: Vineeth Vijayan Reviewed-by: Peter Oberparleiter Signed-off-by: Heiko Carstens Signed-off-by: Greg Kroah-Hartman --- drivers/s390/cio/device_ops.c | 2 ++ 1 file changed, 2 insertions(+) --- a/drivers/s390/cio/device_ops.c +++ b/drivers/s390/cio/device_ops.c @@ -517,6 +517,8 @@ u8 *ccw_device_get_util_str(struct ccw_d chp_id_init(&chpid); chpid.id = sch->schib.pmcw.chpid[chp_idx]; chp = chpid_to_chp(chpid); + if (!chp) + return NULL; util_str = kmalloc(sizeof(chp->desc_fmt3.util_str), GFP_KERNEL); if (!util_str)