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Kernel: Prevent kprintf() from asserting in Console::the() (#718)

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This triggered a stack overflow because ubsan can call kprintf() at any
time, even before Console is initialized.
This commit is contained in:
Nicolas Van Bossuyt 2019-11-03 13:17:55 +01:00 • committed by Andreas Kling
parent 8216019b2e
commit 81c4dcadf1
3 changed files with 14 additions and 1 deletions
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9
Kernel/kprintf.cpp
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@ -70,7 +70,14 @@ static void console_putch(char*&, char ch)
{
if (serial_debug)
serial_putch(ch);
Console::the().put_char(ch);
// It would be bad to reach the assert in Console()::the() and do a stack overflow
if (Console::is_initialized()) {
Console::the().put_char(ch);
} else {
IO::out8(0xe9, ch);
}
}
int kprintf(const char* fmt, ...)