serial: 8250: Check for valid console index

Let's not allow negative numbers for console index. Signed-off-by: Tony Lindgren <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Greg Kroah-Hartman <[email protected]>
nelseric · Oct 5, 2023 · b9cbe7e · b9cbe7e
1 parent 0d447e9
commit b9cbe7e
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c
@@ -611,7 +611,7 @@ static int univ8250_console_setup(struct console *co, char *options)
 	 * if so, search for the first available port that does have
 	 * console support.
 	 */
-	if (co->index >= UART_NR)
+	if (co->index < 0 || co->index >= UART_NR)
 		co->index = 0;
 
 	/*