From d59f8d1c022234140a94c643f4b78bf5487d39f7 Mon Sep 17 00:00:00 2001 From: Jonathan Rascher Date: Wed, 16 Jun 2021 00:30:27 -0500 Subject: [PATCH] Fix overrun in st7565_write_raw when not at (0, 0) (#13209) --- drivers/lcd/st7565.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/lcd/st7565.c b/drivers/lcd/st7565.c index 4b4891ce718..ee2661a5eb2 100644 --- a/drivers/lcd/st7565.c +++ b/drivers/lcd/st7565.c @@ -336,8 +336,9 @@ void st7565_write_raw(const char *data, uint16_t size) { uint16_t cursor_start_index = st7565_cursor - &st7565_buffer[0]; if ((size + cursor_start_index) > ST7565_MATRIX_SIZE) size = ST7565_MATRIX_SIZE - cursor_start_index; for (uint16_t i = cursor_start_index; i < cursor_start_index + size; i++) { - if (st7565_buffer[i] == data[i]) continue; - st7565_buffer[i] = data[i]; + uint8_t c = *data++; + if (st7565_buffer[i] == c) continue; + st7565_buffer[i] = c; st7565_dirty |= ((ST7565_BLOCK_TYPE)1 << (i / ST7565_BLOCK_SIZE)); } }