lkml.org 
[lkml]   [2022]   [Jun]   [28]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 2/2] serial: 8250: dw: Fix NULL pointer dereference
Date
Similarly to e6a08c6949cb, ACPI machines don't have
a pdata setup, leading to a null pointer dereference
when dw8250_handle_irq runs.

Fixes: aa63d786cea2 ("serial: 8250: dw: Add support for DMA flow controlling devices")
Signed-off-by: Jeremy Linton <jeremy.linton@arm.com>
---
drivers/tty/serial/8250/8250_dw.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/tty/serial/8250/8250_dw.c b/drivers/tty/serial/8250/8250_dw.c
index 53e488beb8c2..06f80090cbb9 100644
--- a/drivers/tty/serial/8250/8250_dw.c
+++ b/drivers/tty/serial/8250/8250_dw.c
@@ -237,10 +237,13 @@ static int dw8250_handle_irq(struct uart_port *p)
struct dw8250_data *d = to_dw8250_data(p->private_data);
unsigned int iir = p->serial_in(p, UART_IIR);
bool rx_timeout = (iir & 0x3f) == UART_IIR_RX_TIMEOUT;
- unsigned int quirks = d->pdata->quirks;
+ unsigned int quirks = 0;
unsigned int status;
unsigned long flags;

+ if (d->pdata)
+ quirks = d->pdata->quirks;
+
/*
* There are ways to get Designware-based UARTs into a state where
* they are asserting UART_IIR_RX_TIMEOUT but there is no actual
--
2.35.1
\
 
 \ /
  Last update: 2022-06-29 02:07    [W:0.061 / U:0.312 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site