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[PULL,23/39] chardev/baum: Use definitions to avoid dynamic stack allocation

Message ID 20220922163536.1096175-24-peter.maydell@linaro.org
State Accepted
Commit 1e3acd33576c695262a09262c9319d44a01b11e7
Headers show
Series [PULL,01/39] hw/net/can: fix Xilinx ZynqMP CAN RX FIFO logic | expand

Commit Message

Peter Maydell Sept. 22, 2022, 4:35 p.m. UTC 
From: Philippe Mathieu-Daudé <philmd@redhat.com>

We know 'x * y' will be at most 'X_MAX * Y_MAX' (which is not
a big value, it is actually 84). Instead of having the compiler
use variable-length array, declare an array able to hold the
maximum 'x * y'.

Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 20220819153931.3147384-3-peter.maydell@linaro.org
---
 chardev/baum.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)
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Patch

diff --git a/chardev/baum.c b/chardev/baum.c
index 6d538808a0f..6a210ffd815 100644
--- a/chardev/baum.c
+++ b/chardev/baum.c
@@ -383,9 +383,9 @@  static int baum_eat_packet(BaumChardev *baum, const uint8_t *buf, int len)
     switch (req) {
     case BAUM_REQ_DisplayData:
     {
-        uint8_t cells[baum->x * baum->y], c;
-        uint8_t text[baum->x * baum->y];
-        uint8_t zero[baum->x * baum->y];
+        uint8_t cells[X_MAX * Y_MAX], c;
+        uint8_t text[X_MAX * Y_MAX];
+        uint8_t zero[X_MAX * Y_MAX];
         int cursor = BRLAPI_CURSOR_OFF;
         int i;
 
@@ -408,7 +408,7 @@  static int baum_eat_packet(BaumChardev *baum, const uint8_t *buf, int len)
         }
         timer_del(baum->cellCount_timer);
 
-        memset(zero, 0, sizeof(zero));
+        memset(zero, 0, baum->x * baum->y);
 
         brlapi_writeArguments_t wa = {
             .displayNumber = BRLAPI_DISPLAY_DEFAULT,