diff options
| author | Anton Vasilyev | 2018-08-07 13:59:05 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman | 2018-09-18 16:07:24 +0200 |
| commit | 5963e8a3122471cadfe0eba41c4ceaeaa5c8bb4d (patch) | |
| tree | 3da5f15d79f5c00e6fe920fd27d72d2020868004 | |
| parent | d2de9601eb12e7c5b7519cf155cf613322211b54 (diff) | |
serial: mxs-auart: Fix potential infinite loop
On the error path of mxs_auart_request_gpio_irq() is performed
backward iterating with index i of enum type. Underline enum type
may be unsigned char. In this case check (--i >= 0) will be always
true and error handling goes into infinite loop.
The patch changes the check so that it is valid for signed and unsigned
types.
Found by Linux Driver Verification project (linuxtesting.org).
Signed-off-by: Anton Vasilyev <vasilyev@ispras.ru>
Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/tty/serial/mxs-auart.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/tty/serial/mxs-auart.c b/drivers/tty/serial/mxs-auart.c index 76aa289652f7..27235a526cce 100644 --- a/drivers/tty/serial/mxs-auart.c +++ b/drivers/tty/serial/mxs-auart.c @@ -1634,8 +1634,9 @@ static int mxs_auart_request_gpio_irq(struct mxs_auart_port *s) /* * If something went wrong, rollback. + * Be careful: i may be unsigned. */ - while (err && (--i >= 0)) + while (err && (i-- > 0)) if (irq[i] >= 0) free_irq(irq[i], s); |