[PATCH 1/2] Input: adp5588-keys Add check on return code

[Denis Arefev <arefev@swemel.ru>]

Function 'adp5588_read()' can return a negative value, which after
calculations will be used as an index to access the array
'kpad->keycode'.

Add a check for the return value.

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

Signed-off-by: Denis Arefev <arefev@swemel.ru>
---
 drivers/input/keyboard/adp5588-keys.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/input/keyboard/adp5588-keys.c b/drivers/input/keyboard/adp5588-keys.c
index dc734974ce06..13136f863270 100644
--- a/drivers/input/keyboard/adp5588-keys.c
+++ b/drivers/input/keyboard/adp5588-keys.c
@@ -519,9 +519,14 @@ static void adp5588_report_events(struct adp5588_kpad *kpad, int ev_cnt)
 	int i;
 
 	for (i = 0; i < ev_cnt; i++) {
-		int key = adp5588_read(kpad->client, KEY_EVENTA + i);
-		int key_val = key & KEY_EV_MASK;
-		int key_press = key & KEY_EV_PRESSED;
+		int key, key_val, key_press;
+
+		key = adp5588_read(kpad->client, KEY_EVENTA + i);
+		if (key < 0)
+			continue;
+
+		key_val = key & KEY_EV_MASK;
+		key_press = key & KEY_EV_PRESSED;
 
 		if (key_val >= GPI_PIN_BASE && key_val <= GPI_PIN_END) {
 			/* gpio line used as IRQ source */
-- 
2.43.0