linux-kernel - [lvc-project] [PATCH] Input: cypress_ps2 - fix cypress_ps2

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Message-Id: <20230320151149.1623089-1-Igor.A.Artemiev@mcst.ru>
Date:   Mon, 20 Mar 2023 18:11:49 +0300
From:   Igor Artemiev <Igor.A.Artemiev@...t.ru>
To:     Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:     Igor Artemiev <Igor.A.Artemiev@...t.ru>,
        linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
        lvc-project@...uxtesting.org
Subject: [lvc-project] [PATCH] Input: cypress_ps2 - fix cypress_ps2_sendbyte() result check

cypress_ps2_sendbyte() returns 0 or an error code greater than 0.
The cypress_ps2_read_cmd_status() function assumes that
cypress_ps2_read_cmd_status() will return a negative value on error.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Signed-off-by: Igor Artemiev <Igor.A.Artemiev@...t.ru>
---
 drivers/input/mouse/cypress_ps2.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/input/mouse/cypress_ps2.c b/drivers/input/mouse/cypress_ps2.c
index d272f1ec27ba..b170959e2ad3 100644
--- a/drivers/input/mouse/cypress_ps2.c
+++ b/drivers/input/mouse/cypress_ps2.c
@@ -114,7 +114,7 @@ static int cypress_ps2_read_cmd_status(struct psmouse *psmouse,
 	memset(param, 0, pktsize);
 
 	rc = cypress_ps2_sendbyte(psmouse, 0xe9);
-	if (rc < 0)
+	if (rc > 0)
 		goto out;
 
 	wait_event_timeout(ps2dev->wait,
-- 
2.30.2