[SeaBIOS] [PATCH] Fix CBMEM console overflow

[Kyösti Mälkki]

In CBMEM console, cursor increments past the buffer size to
indicate the number of characters missing from log output.

Signed-off-by: Kyösti Mälkki 
---
  src/fw/coreboot.c | 6 +++---
  1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/fw/coreboot.c b/src/fw/coreboot.c
index 5b7e77a..cc316df 100644
--- a/src/fw/coreboot.c
+++ b/src/fw/coreboot.c
@@ -208,9 +208,9 @@ void coreboot_debug_putc(char c)
          return;
      if (!cbcon)
          return;
-    if (cbcon->buffer_cursor == cbcon->buffer_size)
-        return;
-    cbcon->buffer_body[cbcon->buffer_cursor++] = c;
+    u32 cursor = cbcon->buffer_cursor++;
+    if (cursor < cbcon->buffer_size)
+        cbcon->buffer_body[cursor] = c;
  }

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