patch "termios, tty/tty_baudrate.c: fix buffer overrun" added to tty-linus

This is a note to let you know that I've just added the patch titled

termios, tty/tty_baudrate.c: fix buffer overrun

to my tty git tree which can be found at
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty.git
in the tty-linus branch.

The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.)

The patch will hopefully also be merged in Linus's tree for the next -rc kernel release.

If you have any questions about this process, please let me know.

From: "H. Peter Anvin" <[email protected]>
Date: Mon, 22 Oct 2018 09:19:04 -0700
Subject: termios, tty/tty_baudrate.c: fix buffer overrun

On architectures with CBAUDEX == 0 (Alpha and PowerPC), the code in tty_baudrate.c does not do any limit checking on the tty_baudrate[] array, and in fact a buffer overrun is possible on both architectures. Add a limit check to prevent that situation.

This will be followed by a much bigger cleanup/simplification patch.

---
 drivers/tty/tty_baudrate.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

index 7576ceace571..f438eaa68246 100644
@@ -77,7 +77,7 @@ speed_t tty_termios_baud_rate(struct ktermios *termios)
 		else
 			cbaud += 15;
 	}
-	return baud_table[cbaud];
+	return cbaud >= n_baud_table ? 0 : baud_table[cbaud];
 }
 EXPORT_SYMBOL(tty_termios_baud_rate);
 

@@ -113,7 +113,7 @@ speed_t tty_termios_input_baud_rate(struct ktermios *termios)
 		else
 			cbaud += 15;
 	}
-	return baud_table[cbaud];
+	return cbaud >= n_baud_table ? 0 : baud_table[cbaud];
 #else	/* IBSHIFT */
 	return tty_termios_baud_rate(termios);
 #endif	/* IBSHIFT */

2.19.1