tree fbb0addd0eda97f27448a3901933bc9bf2eeac32
parent 99722d146c94de7d470576141dfe6a459515f997
author Anton Vasilyev <vasilyev@ispras.ru> 1533639545 +0300
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1574671947 +0100

serial: mxs-auart: Fix potential infinite loop

[ Upstream commit 5963e8a3122471cadfe0eba41c4ceaeaa5c8bb4d ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>