Input: atmel_mxt_ts - fix a few issues reported by Coverity

This should fix the following issues reported by Coverity:

*** CID 1230625:  Logically dead code  (DEADCODE)
/drivers/input/touchscreen/atmel_mxt_ts.c: 1692 in mxt_initialize()

*** CID 1230627:  Missing break in switch  (MISSING_BREAK)
/drivers/input/touchscreen/atmel_mxt_ts.c: 1436 in mxt_get_object_table()

*** CID 1230629:  Out-of-bounds write  (OVERRUN)
/drivers/input/touchscreen/atmel_mxt_ts.c: 1267 in mxt_update_cfg()

*** CID 1230632:  Unused pointer value  (UNUSED_VALUE)
/drivers/input/touchscreen/atmel_mxt_ts.c: 1211 in mxt_update_cfg()

Acked-by: Nick Dyer <nick.dyer@itdev.co.uk>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

diff --git a/drivers/input/touchscreen/atmel_mxt_ts.c b/drivers/input/touchscreen/atmel_mxt_ts.c
index bbaf3ff..db178ed 100644 (file)
--- a/drivers/input/touchscreen/atmel_mxt_ts.c
+++ b/drivers/input/touchscreen/atmel_mxt_ts.c
@@ -1098,8 +1098,12 @@ static int mxt_prepare_cfg_mem(struct mxt_data *data,
                        /* Skip object */
                        for (i = 0; i < size; i++) {
                                ret = sscanf(cfg->data + data_pos, "%hhx%n",
-                                            &val,
-                                            &offset);
+                                            &val, &offset);
+                               if (ret != 1) {
+                                       dev_err(dev, "Bad format in T%d at %d\n",
+                                               type, i);
+                                       return -EINVAL;
+                               }
                                data_pos += offset;
                        }
                        continue;
@@ -1139,7 +1143,8 @@ static int mxt_prepare_cfg_mem(struct mxt_data *data,
                                     &val,
                                     &offset);
                        if (ret != 1) {
-                               dev_err(dev, "Bad format in T%d\n", type);
+                               dev_err(dev, "Bad format in T%d at %d\n",
+                                       type, i);
                                return -EINVAL;
                        }
                        data_pos += offset;
@@ -1149,8 +1154,7 @@ static int mxt_prepare_cfg_mem(struct mxt_data *data,
 
                        byte_offset = reg + i - cfg_start_ofs;
 
-                       if (byte_offset >= 0 &&
-                           byte_offset <= config_mem_size) {
+                       if (byte_offset >= 0 && byte_offset < config_mem_size) {
                                *(config_mem + byte_offset) = val;
                        } else {
                                dev_err(dev, "Bad object: reg:%d, T%d, ofs=%d\n",
@@ -1454,6 +1458,7 @@ static int mxt_get_object_table(struct mxt_data *data)
                                data->T5_msg_size = mxt_obj_size(object) - 1;
                        }
                        data->T5_address = object->start_address;
+                       break;
                case MXT_GEN_COMMAND_T6:
                        data->T6_reportid = min_id;
                        data->T6_address = object->start_address;
@@ -1707,7 +1712,7 @@ static int mxt_initialize(struct mxt_data *data)
                return error;
        }
 
-       mxt_acquire_irq(data);
+       error = mxt_acquire_irq(data);
        if (error)
                goto err_free_object_table;