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

serial: sprd: Fix a dereference warning

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-testing 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 be merged to the tty-next branch sometime soon, after it passes testing, and the merge window is open.

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

From efc176929a3505a30c3993ddd393b40893649bd2 Mon Sep 17 00:00:00 2001

From: Lanqing Liu liuhhome@gmail.com Date: Mon, 16 Mar 2020 11:13:33 +0800 Subject: serial: sprd: Fix a dereference warning

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: f4487db58eb7 ("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.158432595... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/tty/serial/sprd_serial.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/tty/serial/sprd_serial.c b/drivers/tty/serial/sprd_serial.c index 914862844790..509781ee26bf 100644 --- a/drivers/tty/serial/sprd_serial.c +++ b/drivers/tty/serial/sprd_serial.c @@ -1132,14 +1132,13 @@ 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; }