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[lvc-project] Input: cypress_ps2 - fix cypress_ps2_sendbyte() result check

Message ID 20230220123458.712530-1-Igor.A.Artemiev@mcst.ru
State Superseded
Headers show
Series [lvc-project] Input: cypress_ps2 - fix cypress_ps2_sendbyte() result check | expand

Commit Message

Igor Artemiev Feb. 20, 2023, 12:34 p.m. UTC
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.

Fixes: 0799a924bc93 ("Input: add support for Cypress PS/2 Trackpads")
Signed-off-by: Igor Artemiev <Igor.A.Artemiev@mcst.ru>
---
 drivers/input/mouse/cypress_ps2.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
diff mbox series

Patch

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,