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[Backport v4.0-branch] i2c: target: eeprom_target: Fix buffer write #81659

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Merged
merged 1 commit into from
Dec 6, 2024
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[Backport v4.0-branch] i2c: target: eeprom_target: Fix buffer write #81659

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16 changes: 13 additions & 3 deletions drivers/i2c/target/eeprom_target.c
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Original file line number Diff line number Diff line change
Expand Up @@ -179,9 +179,19 @@ static void eeprom_target_buf_write_received(struct i2c_target_config *config,
struct i2c_eeprom_target_data *data = CONTAINER_OF(config,
struct i2c_eeprom_target_data,
config);
/* The first byte is offset */
data->buffer_idx = *ptr;
memcpy(&data->buffer[data->buffer_idx], ptr + 1, len - 1);
/* The first byte(s) is offset */
uint32_t idx_write_cnt = 0;

data->buffer_idx = 0;
while (idx_write_cnt < (data->address_width >> 3)) {
data->buffer_idx = (data->buffer_idx << 8) | *ptr++;
len--;
idx_write_cnt++;
}

if (len > 0) {
memcpy(&data->buffer[data->buffer_idx], ptr, len);
}
}

static int eeprom_target_buf_read_requested(struct i2c_target_config *config,
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