[ALPS05276847] Leds: fix the coverity issue

[Detail]
Fix snprintf out of bounds

MTK-Commit-Id: 44bd8e132a70d7126e5fde3e938bdfa72f1f13ee

Change-Id: I8964d292fbbbdf8929b5b2cc755184a1aacb747c
Signed-off-by: Xing Zhang <xing.zhang@mediatek.com>
CR-Id: ALPS05276847
Feature: [Android Default] Backlight

drivers/misc/mediatek/leds/leds-mtk-disp.c

@@ -122,7 +122,8 @@ static void led_debug_log(struct mtk_led_data *s_led,
 	cur_time_mod = do_div(cur_time_display, 1000);
 
 	ret = snprintf(s_led->debug.buffer + strlen(s_led->debug.buffer),
-		4096, "T:%lld.%ld,L:%d L:%d map:%d    ",
+		4095 - strlen(s_led->debug.buffer),
+		"T:%lld.%ld,L:%d L:%d map:%d    ",
 		cur_time_display, cur_time_mod,
 		s_led->conf.cdev.brightness, level, mappingLevel);
 
@@ -303,7 +304,8 @@ static int led_data_init(struct device *dev, struct mtk_led_data *s_led)
 	pr_info("%s devm_led_classdev_register ok! ", s_led->conf.cdev.name);
 
 	ret = snprintf(s_led->debug.buffer + strlen(s_led->debug.buffer),
-		4096, "[Light] Set %s directly ", s_led->conf.cdev.name);
+		4095 - strlen(s_led->debug.buffer),
+		"[Light] Set %s directly ", s_led->conf.cdev.name);
 	if (ret < 0 || ret >= 4096)
 		pr_info("print log init error!");
 

drivers/misc/mediatek/leds/leds-mtk-pwm.c

@@ -125,7 +125,8 @@ static void led_debug_log(struct mtk_led_data *s_led,
 	cur_time_mod = do_div(cur_time_display, 1000);
 
 	ret = snprintf(s_led->debug.buffer + strlen(s_led->debug.buffer),
-		4096, "T:%lld.%ld,L:%d L:%d map:%d    ",
+		4095 - strlen(s_led->debug.buffer),
+		"T:%lld.%ld,L:%d L:%d map:%d    ",
 		cur_time_display, cur_time_mod,
 		s_led->conf.cdev.brightness, level, mappingLevel);
 
@@ -353,7 +354,8 @@ static int led_data_init(struct device *dev, struct mtk_led_data *s_led)
 
 	INIT_WORK(&s_led->work, mtk_led_work);
 	ret = snprintf(s_led->debug.buffer + strlen(s_led->debug.buffer),
-		4096, "[Light] Set %s directly ", s_led->conf.cdev.name);
+		4095 - strlen(s_led->debug.buffer),
+		"[Light] Set %s directly ", s_led->conf.cdev.name);
 
 	if (ret < 0 || ret >= 4096)
 		pr_info("print log init error!");

drivers/misc/mediatek/leds/mt6739/mtk_leds.c

@@ -138,7 +138,7 @@ static void backlight_debug_log(int level, int mappingLevel)
 	cur_time_mod = do_div(cur_time_display, 1000);
 
 	ret = snprintf(buffer + strlen(buffer),
-		4096, "T:%lld.%ld,L:%d map:%d    ",
+		4095 - strlen(buffer), "T:%lld.%ld,L:%d map:%d    ",
 		cur_time_display, cur_time_mod, level, mappingLevel);
 
 	count++;

drivers/misc/mediatek/leds/mt6765/mtk_leds.c

@@ -139,7 +139,7 @@ static void backlight_debug_log(int level, int mappingLevel)
 	cur_time_mod = do_div(cur_time_display, 1000);
 
 	ret = snprintf(buffer + strlen(buffer),
-		4096, "T:%lld.%ld,L:%d map:%d    ",
+		4095 - strlen(buffer), "T:%lld.%ld,L:%d map:%d    ",
 		cur_time_display, cur_time_mod, level, mappingLevel);
 
 	count++;

drivers/misc/mediatek/leds/mt6768/mtk_leds.c

@@ -130,7 +130,7 @@ static void backlight_debug_log(int level, int mappingLevel)
 	cur_time_mod = do_div(cur_time_display, 1000);
 
 	ret = snprintf(buffer + strlen(buffer),
-		4096, "T:%lld.%ld,L:%d map:%d    ",
+		4095 - strlen(buffer), "T:%lld.%ld,L:%d map:%d    ",
 		cur_time_display, cur_time_mod, level, mappingLevel);
 
 	count++;

drivers/misc/mediatek/leds/mt6771/mtk_leds.c

@@ -130,7 +130,7 @@ static void backlight_debug_log(int level, int mappingLevel)
 	cur_time_mod = do_div(cur_time_display, 1000);
 
 	ret = snprintf(buffer + strlen(buffer),
-		4096, "T:%lld.%ld,L:%d map:%d    ",
+		4095 - strlen(buffer), "T:%lld.%ld,L:%d map:%d    ",
 		cur_time_display, cur_time_mod, level, mappingLevel);
 
 	count++;

drivers/misc/mediatek/leds/mt6785/mtk_leds.c

@@ -130,7 +130,7 @@ static void backlight_debug_log(int level, int mappingLevel)
 	cur_time_mod = do_div(cur_time_display, 1000);
 
 	ret = snprintf(buffer + strlen(buffer),
-		4096, "T:%lld.%ld,L:%d map:%d    ",
+		4095 - strlen(buffer), "T:%lld.%ld,L:%d map:%d    ",
 		cur_time_display, cur_time_mod, level, mappingLevel);
 
 	count++;

drivers/misc/mediatek/leds/mt6853/mtk_leds.c

@@ -133,7 +133,7 @@ static void backlight_debug_log(int level, int mappingLevel)
 	cur_time_mod = do_div(cur_time_display, 1000);
 
 	ret = snprintf(buffer + strlen(buffer),
-		4096, "T:%lld.%ld,L:%d map:%d    ",
+		4095 - strlen(buffer), "T:%lld.%ld,L:%d map:%d    ",
 		cur_time_display, cur_time_mod, level, mappingLevel);
 
 	count++;

drivers/misc/mediatek/leds/mt6873/mtk_leds.c

@@ -133,7 +133,7 @@ static void backlight_debug_log(int level, int mappingLevel)
 	cur_time_mod = do_div(cur_time_display, 1000);
 
 	ret = snprintf(buffer + strlen(buffer),
-		4096, "T:%lld.%ld,L:%d map:%d    ",
+		4095 - strlen(buffer), "T:%lld.%ld,L:%d map:%d    ",
 		cur_time_display, cur_time_mod, level, mappingLevel);
 
 	count++;

drivers/misc/mediatek/leds/mt6885/mtk_leds.c

@@ -140,7 +140,7 @@ static void backlight_debug_log(int level, int mappingLevel)
 	cur_time_mod = do_div(cur_time_display, 1000);
 
 	ret = snprintf(buffer + strlen(buffer),
-		4096, "T:%lld.%ld,L:%d map:%d    ",
+		4095 - strlen(buffer), "T:%lld.%ld,L:%d map:%d    ",
 		cur_time_display, cur_time_mod, level, mappingLevel);
 
 	count++;