From 1ef3d8fb4deb77ee020b246d217dd4dfb28d88d5 Mon Sep 17 00:00:00 2001 From: Dan Carpenter Date: Thu, 15 Mar 2012 14:37:32 +0300 Subject: max17042_battery: Fix a couple buffer overflows There are a couple issues here caused by confusion between sizeof() and ARRAY_SIZE(). "table_size" should be the number of elements, but we should allocate it with kcalloc() so that we allocate the correct number of bytes. In max17042_init_model() we don't allocate enough space so we go past the end of the array in max17042_read_model_data() and max17042_model_data_compare(). In max17042_verify_model_lock() we allocate the right amount of space but we call max17042_read_model_data() with the wrong number of elements and also in the for loop we go past the end of the array. Signed-off-by: Dan Carpenter Acked-by: Dirk Brandewie Signed-off-by: Anton Vorontsov --- drivers/power/max17042_battery.c | 10 ++++------ 1 file changed, 4 insertions(+), 6 deletions(-) (limited to 'drivers/power/max17042_battery.c') diff --git a/drivers/power/max17042_battery.c b/drivers/power/max17042_battery.c index 04620c2cb38..39dd610994a 100644 --- a/drivers/power/max17042_battery.c +++ b/drivers/power/max17042_battery.c @@ -325,11 +325,10 @@ static inline int max17042_model_data_compare(struct max17042_chip *chip, static int max17042_init_model(struct max17042_chip *chip) { int ret; - int table_size = - sizeof(chip->pdata->config_data->cell_char_tbl)/sizeof(u16); + int table_size = ARRAY_SIZE(chip->pdata->config_data->cell_char_tbl); u16 *temp_data; - temp_data = kzalloc(table_size, GFP_KERNEL); + temp_data = kcalloc(table_size, sizeof(*temp_data), GFP_KERNEL); if (!temp_data) return -ENOMEM; @@ -354,12 +353,11 @@ static int max17042_init_model(struct max17042_chip *chip) static int max17042_verify_model_lock(struct max17042_chip *chip) { int i; - int table_size = - sizeof(chip->pdata->config_data->cell_char_tbl); + int table_size = ARRAY_SIZE(chip->pdata->config_data->cell_char_tbl); u16 *temp_data; int ret = 0; - temp_data = kzalloc(table_size, GFP_KERNEL); + temp_data = kcalloc(table_size, sizeof(*temp_data), GFP_KERNEL); if (!temp_data) return -ENOMEM; -- cgit v1.2.3