pinctrl: exynos5440: fix issues reported by prevent tool

This patch fixes issues reported by prevent tool.

Signed-off-by: Thomas Abraham <[e-mail]>
Signed-off-by: Kukjin Kim <[e-mail]>
[Drop hunk already in-tree from a patch by Wei Yongjun]
Signed-off-by: Linus Walleij <[e-mail]>

drivers/pinctrl/pinctrl-exynos5440.c

···
 		dev_err(dev, "failed to alloc memory for group name\n");
 		goto free_map;
 	}
-	sprintf(gname, "%s%s", np->name, GROUP_SUFFIX);
+	snprintf(gname, strlen(np->name) + 4, "%s%s", np->name, GROUP_SUFFIX);
 
 	/*
 	 * don't have config options? then skip over to creating function
···
 			dev_err(dev, "failed to alloc memory for func name\n");
 			goto free_cfg;
 		}
-		sprintf(fname, "%s%s", np->name, FUNCTION_SUFFIX);
+		snprintf(fname, strlen(np->name) + 4, "%s%s", np->name,
+			 FUNCTION_SUFFIX);
 
 		map[*nmaps].data.mux.group = gname;
 		map[*nmaps].data.mux.function = fname;
···
 			dev_err(dev, "failed to alloc memory for group name\n");
 			return -ENOMEM;
 		}
-		sprintf(gname, "%s%s", cfg_np->name, GROUP_SUFFIX);
+		snprintf(gname, strlen(cfg_np->name) + 4, "%s%s", cfg_np->name,
+			 GROUP_SUFFIX);
 
 		grp->name = gname;
 		grp->pins = pin_list;
···
 			dev_err(dev, "failed to alloc memory for func name\n");
 			return -ENOMEM;
 		}
-		sprintf(fname, "%s%s", cfg_np->name, FUNCTION_SUFFIX);
+		snprintf(fname, strlen(cfg_np->name) + 4, "%s%s", cfg_np->name,
+			 FUNCTION_SUFFIX);
 
 		func->name = fname;
 		func->groups = devm_kzalloc(dev, sizeof(char *), GFP_KERNEL);
···
 
 	/* for each pin, set the name of the pin */
 	for (pin = 0; pin < ctrldesc->npins; pin++) {
-		sprintf(pin_names, "gpio%02d", pin);
+		snprintf(pin_names, 6, "gpio%02d", pin);
 		pdesc = pindesc + pin;
 		pdesc->name = pin_names;
 		pin_names += PIN_NAME_LENGTH;