linux-kernel - [PATCH v2 1/2] cxl/mbox: Use correct handle in events debug message

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20230731-cxl-fix-clear-event-debug-print-v2-1-9bdd08d386e9@intel.com>
Date:   Tue, 01 Aug 2023 13:13:28 -0700
From:   Ira Weiny <ira.weiny@...el.com>
To:     Davidlohr Bueso <dave@...olabs.net>,
        Jonathan Cameron <jonathan.cameron@...wei.com>,
        Dave Jiang <dave.jiang@...el.com>,
        Alison Schofield <alison.schofield@...el.com>,
        Vishal Verma <vishal.l.verma@...el.com>,
        Dan Williams <dan.j.williams@...el.com>
Cc:     linux-cxl@...r.kernel.org, linux-kernel@...r.kernel.org,
        Ira Weiny <ira.weiny@...el.com>
Subject: [PATCH v2 1/2] cxl/mbox: Use correct handle in events debug
 message

The handle value used to report an event being cleared by dev_dbg() is
incorrect due to a post increment of the payload handle index.

Delay the increment of the index until after the print.

Fixes: 6ebe28f9ec72 ("cxl/mem: Read, trace, and clear events on driver load")
Signed-off-by: Ira Weiny <ira.weiny@...el.com>

---
Changes for v2
[Dan] Go ahead and mark this for backporting
[Dan] Remove 'To/Cc' cruft from individual patches
[Dan/Alison] Split out the additional debugging
[Alison] New oneliner
---
 drivers/cxl/core/mbox.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/cxl/core/mbox.c b/drivers/cxl/core/mbox.c
index d6d067fbee97..a1c490f66bbf 100644
--- a/drivers/cxl/core/mbox.c
+++ b/drivers/cxl/core/mbox.c
@@ -882,9 +882,10 @@ static int cxl_clear_event_record(struct cxl_memdev_state *mds,
 	 */
 	i = 0;
 	for (cnt = 0; cnt < total; cnt++) {
-		payload->handles[i++] = get_pl->records[cnt].hdr.handle;
+		payload->handles[i] = get_pl->records[cnt].hdr.handle;
 		dev_dbg(mds->cxlds.dev, "Event log '%d': Clearing %u\n", log,
 			le16_to_cpu(payload->handles[i]));
+		i++;
 
 		if (i == max_handles) {
 			payload->nr_recs = i;

-- 
2.41.0