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serial: sprd: Fix a dereference warning 

commit efc176929a upstream.

We should validate if the 'sup' is NULL or not before freeing DMA
memory, to fix below warning.

"drivers/tty/serial/sprd_serial.c:1141 sprd_remove()
 error: we previously assumed 'sup' could be null (see line 1132)"

Fixes: f4487db58e ("serial: sprd: Add DMA mode support")
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Lanqing Liu <liuhhome@gmail.com>
Cc: stable <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/e2bd92691538e95b04a2c2a728f3292e1617018f.1584325957.git.liuhhome@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
5.4-rM2-2.2.x-imx-squashed
Lanqing Liu 2020-03-16 11:13:33 +08:00 committed by Greg Kroah-Hartman
parent 5b1bd4900f
commit 125dd8c48b
1 changed files with 1 additions and 2 deletions
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3
drivers/tty/serial/sprd_serial.c
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@ -1103,14 +1103,13 @@ static int sprd_remove(struct platform_device *dev)
if (sup) {
uart_remove_one_port(&sprd_uart_driver, &sup->port);
sprd_port[sup->port.line] = NULL;
sprd_rx_free_buf(sup);
sprd_ports_num--;
}
if (!sprd_ports_num)
uart_unregister_driver(&sprd_uart_driver);
sprd_rx_free_buf(sup);
return 0;
}