Input: db9 - fix possible crash with Saturn gamepads

Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

1 files changed, 36 insertions, 34 deletions

diff --git a/drivers/input/joystick/db9.c b/drivers/input/joystick/db9.c
index 499344c72756..98479b82842d 100644
--- a/drivers/input/joystick/db9.c
+++ b/drivers/input/joystick/db9.c
@@ -275,68 +275,70 @@ static unsigned char db9_saturn_read_packet(struct parport *port, unsigned char
 /*
  * db9_saturn_report() analyzes packet and reports.
  */
-static int db9_saturn_report(unsigned char id, unsigned char data[60], struct input_dev *dev, int n, int max_pads)
+static int db9_saturn_report(unsigned char id, unsigned char data[60], struct input_dev *devs[], int n, int max_pads)
 {
+        struct input_dev *dev;
         int tmp, i, j;
 
         tmp = (id == 0x41) ? 60 : 10;
-        for (j = 0; (j < tmp) && (n < max_pads); j += 10, n++) {
+        for (j = 0; j < tmp && n < max_pads; j += 10, n++) {
+                dev = devs[n];
                 switch (data[j]) {
                 case 0x16: /* multi controller (analog 4 axis) */
-                        input_report_abs(dev + n, db9_abs[5], data[j + 6]);
+                        input_report_abs(dev, db9_abs[5], data[j + 6]);
                 case 0x15: /* mission stick (analog 3 axis) */
-                        input_report_abs(dev + n, db9_abs[3], data[j + 4]);
-                        input_report_abs(dev + n, db9_abs[4], data[j + 5]);
+                        input_report_abs(dev, db9_abs[3], data[j + 4]);
+                        input_report_abs(dev, db9_abs[4], data[j + 5]);
                 case 0x13: /* racing controller (analog 1 axis) */
-                        input_report_abs(dev + n, db9_abs[2], data[j + 3]);
+                        input_report_abs(dev, db9_abs[2], data[j + 3]);
                 case 0x34: /* saturn keyboard (udlr ZXC ASD QE Esc) */
                 case 0x02: /* digital pad (digital 2 axis + buttons) */
-                        input_report_abs(dev + n, db9_abs[0], !(data[j + 1] & 128) - !(data[j + 1] & 64));
-                        input_report_abs(dev + n, db9_abs[1], !(data[j + 1] & 32) - !(data[j + 1] & 16));
+                        input_report_abs(dev, db9_abs[0], !(data[j + 1] & 128) - !(data[j + 1] & 64));
+                        input_report_abs(dev, db9_abs[1], !(data[j + 1] & 32) - !(data[j + 1] & 16));
                         for (i = 0; i < 9; i++)
-                                input_report_key(dev + n, db9_cd32_btn[i], ~data[j + db9_saturn_byte[i]] & db9_saturn_mask[i]);
+                                input_report_key(dev, db9_cd32_btn[i], ~data[j + db9_saturn_byte[i]] & db9_saturn_mask[i]);
                         break;
                 case 0x19: /* mission stick x2 (analog 6 axis + buttons) */
-                        input_report_abs(dev + n, db9_abs[0], !(data[j + 1] & 128) - !(data[j + 1] & 64));
-                        input_report_abs(dev + n, db9_abs[1], !(data[j + 1] & 32) - !(data[j + 1] & 16));
+                        input_report_abs(dev, db9_abs[0], !(data[j + 1] & 128) - !(data[j + 1] & 64));
+                        input_report_abs(dev, db9_abs[1], !(data[j + 1] & 32) - !(data[j + 1] & 16));
                         for (i = 0; i < 9; i++)
-                                input_report_key(dev + n, db9_cd32_btn[i], ~data[j + db9_saturn_byte[i]] & db9_saturn_mask[i]);
-                        input_report_abs(dev + n, db9_abs[2], data[j + 3]);
-                        input_report_abs(dev + n, db9_abs[3], data[j + 4]);
-                        input_report_abs(dev + n, db9_abs[4], data[j + 5]);
+                                input_report_key(dev, db9_cd32_btn[i], ~data[j + db9_saturn_byte[i]] & db9_saturn_mask[i]);
+                        input_report_abs(dev, db9_abs[2], data[j + 3]);
+                        input_report_abs(dev, db9_abs[3], data[j + 4]);
+                        input_report_abs(dev, db9_abs[4], data[j + 5]);
                         /*
-                        input_report_abs(dev + n, db9_abs[8], (data[j + 6] & 128 ? 0 : 1) - (data[j + 6] & 64 ? 0 : 1));
-                        input_report_abs(dev + n, db9_abs[9], (data[j + 6] & 32 ? 0 : 1) - (data[j + 6] & 16 ? 0 : 1));
+                        input_report_abs(dev, db9_abs[8], (data[j + 6] & 128 ? 0 : 1) - (data[j + 6] & 64 ? 0 : 1));
+                        input_report_abs(dev, db9_abs[9], (data[j + 6] & 32 ? 0 : 1) - (data[j + 6] & 16 ? 0 : 1));
                         */
-                        input_report_abs(dev + n, db9_abs[6], data[j + 7]);
-                        input_report_abs(dev + n, db9_abs[7], data[j + 8]);
-                        input_report_abs(dev + n, db9_abs[5], data[j + 9]);
+                        input_report_abs(dev, db9_abs[6], data[j + 7]);
+                        input_report_abs(dev, db9_abs[7], data[j + 8]);
+                        input_report_abs(dev, db9_abs[5], data[j + 9]);
                         break;
                 case 0xd3: /* sankyo ff (analog 1 axis + stop btn) */
-                        input_report_key(dev + n, BTN_A, data[j + 3] & 0x80);
-                        input_report_abs(dev + n, db9_abs[2], data[j + 3] & 0x7f);
+                        input_report_key(dev, BTN_A, data[j + 3] & 0x80);
+                        input_report_abs(dev, db9_abs[2], data[j + 3] & 0x7f);
                         break;
                 case 0xe3: /* shuttle mouse (analog 2 axis + buttons. signed value) */
-                        input_report_key(dev + n, BTN_START, data[j + 1] & 0x08);
-                        input_report_key(dev + n, BTN_A, data[j + 1] & 0x04);
-                        input_report_key(dev + n, BTN_C, data[j + 1] & 0x02);
-                        input_report_key(dev + n, BTN_B, data[j + 1] & 0x01);
-                        input_report_abs(dev + n, db9_abs[2], data[j + 2] ^ 0x80);
-                        input_report_abs(dev + n, db9_abs[3], (0xff-(data[j + 3] ^ 0x80))+1); /* */
+                        input_report_key(dev, BTN_START, data[j + 1] & 0x08);
+                        input_report_key(dev, BTN_A, data[j + 1] & 0x04);
+                        input_report_key(dev, BTN_C, data[j + 1] & 0x02);
+                        input_report_key(dev, BTN_B, data[j + 1] & 0x01);
+                        input_report_abs(dev, db9_abs[2], data[j + 2] ^ 0x80);
+                        input_report_abs(dev, db9_abs[3], (0xff-(data[j + 3] ^ 0x80))+1); /* */
                         break;
                 case 0xff:
                 default: /* no pad */
-                        input_report_abs(dev + n, db9_abs[0], 0);
-                        input_report_abs(dev + n, db9_abs[1], 0);
+                        input_report_abs(dev, db9_abs[0], 0);
+                        input_report_abs(dev, db9_abs[1], 0);
                         for (i = 0; i < 9; i++)
-                                input_report_key(dev + n, db9_cd32_btn[i], 0);
+                                input_report_key(dev, db9_cd32_btn[i], 0);
                         break;
                 }
         }
         return n;
 }
 
-static int db9_saturn(int mode, struct parport *port, struct input_dev *dev)
+static int db9_saturn(int mode, struct parport *port, struct input_dev *devs[])
 {
         unsigned char id, data[60];
         int type, n, max_pads;
@@ -361,7 +363,7 @@ static int db9_saturn(int mode, struct parport *port, struct input_dev *dev)
         max_pads = min(db9_modes[mode].n_pads, DB9_MAX_DEVICES);
         for (tmp = 0, i = 0; i < n; i++) {
                 id = db9_saturn_read_packet(port, data, type + i, 1);
-                tmp = db9_saturn_report(id, data, dev, tmp, max_pads);
+                tmp = db9_saturn_report(id, data, devs, tmp, max_pads);
         }
         return 0;
 }
@@ -489,7 +491,7 @@ static void db9_timer(unsigned long private)
                 case DB9_SATURN_DPP:
                 case DB9_SATURN_DPP_2:
 
-                        db9_saturn(db9->mode, port, dev);
+                        db9_saturn(db9->mode, port, db9->dev);
                         break;
 
                 case DB9_CD32_PAD: