From: He Zhe <[email protected]>
The initialization code of interrupt backoff work might reference NULL
pointer and cause the following crash, if no port was found.
[ 10.017727] CPU 0 Unable to handle kernel paging request at virtual address 000001b0, epc == 807088e0, ra == 8070863c
---- snip ----
[ 11.704470] [<807088e0>] serial8250_register_8250_port+0x318/0x4ac
[ 11.747251] [<80708d74>] serial8250_probe+0x148/0x1c0
[ 11.789301] [<80728450>] platform_drv_probe+0x40/0x94
[ 11.830515] [<807264f8>] really_probe+0xf8/0x318
[ 11.870876] [<80726b7c>] __driver_attach+0x110/0x12c
[ 11.910960] [<80724374>] bus_for_each_dev+0x78/0xcc
[ 11.951134] [<80725958>] bus_add_driver+0x200/0x234
[ 11.989756] [<807273d8>] driver_register+0x84/0x148
[ 12.029832] [<80d72f84>] serial8250_init+0x138/0x198
[ 12.070447] [<80100e6c>] do_one_initcall+0x5c/0x2a0
[ 12.110104] [<80d3a208>] kernel_init_freeable+0x370/0x484
[ 12.150722] [<80a49420>] kernel_init+0x10/0xf8
[ 12.191517] [<8010756c>] ret_from_kernel_thread+0x14/0x1c
This patch makes sure the initialization code can be reached only if a port
is found.
Fixes: commit 6d7f677a2afa ("serial: 8250: Rate limit serial port rx interrupts during input overruns")
Signed-off-by: He Zhe <[email protected]>
---
drivers/tty/serial/8250/8250_core.c | 17 +++++++++--------
1 file changed, 9 insertions(+), 8 deletions(-)
diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c
index 189ab12..e441221 100644
--- a/drivers/tty/serial/8250/8250_core.c
+++ b/drivers/tty/serial/8250/8250_core.c
@@ -1070,15 +1070,16 @@ int serial8250_register_8250_port(struct uart_8250_port *up)
ret = 0;
}
- }
- /* Initialise interrupt backoff work if required */
- if (up->overrun_backoff_time_ms > 0) {
- uart->overrun_backoff_time_ms = up->overrun_backoff_time_ms;
- INIT_DELAYED_WORK(&uart->overrun_backoff,
- serial_8250_overrun_backoff_work);
- } else {
- uart->overrun_backoff_time_ms = 0;
+ /* Initialise interrupt backoff work if required */
+ if (up->overrun_backoff_time_ms > 0) {
+ uart->overrun_backoff_time_ms =
+ up->overrun_backoff_time_ms;
+ INIT_DELAYED_WORK(&uart->overrun_backoff,
+ serial_8250_overrun_backoff_work);
+ } else {
+ uart->overrun_backoff_time_ms = 0;
+ }
}
mutex_unlock(&serial_mutex);
--
2.7.4
On 17/01/19 10:00 PM, [email protected] wrote:
> From: He Zhe <[email protected]>
>
> The initialization code of interrupt backoff work might reference NULL
> pointer and cause the following crash, if no port was found.
>
> [ 10.017727] CPU 0 Unable to handle kernel paging request at virtual address 000001b0, epc == 807088e0, ra == 8070863c
> ---- snip ----
> [ 11.704470] [<807088e0>] serial8250_register_8250_port+0x318/0x4ac
> [ 11.747251] [<80708d74>] serial8250_probe+0x148/0x1c0
> [ 11.789301] [<80728450>] platform_drv_probe+0x40/0x94
> [ 11.830515] [<807264f8>] really_probe+0xf8/0x318
> [ 11.870876] [<80726b7c>] __driver_attach+0x110/0x12c
> [ 11.910960] [<80724374>] bus_for_each_dev+0x78/0xcc
> [ 11.951134] [<80725958>] bus_add_driver+0x200/0x234
> [ 11.989756] [<807273d8>] driver_register+0x84/0x148
> [ 12.029832] [<80d72f84>] serial8250_init+0x138/0x198
> [ 12.070447] [<80100e6c>] do_one_initcall+0x5c/0x2a0
> [ 12.110104] [<80d3a208>] kernel_init_freeable+0x370/0x484
> [ 12.150722] [<80a49420>] kernel_init+0x10/0xf8
> [ 12.191517] [<8010756c>] ret_from_kernel_thread+0x14/0x1c
>
> This patch makes sure the initialization code can be reached only if a port
> is found.
>
> Fixes: commit 6d7f677a2afa ("serial: 8250: Rate limit serial port rx interrupts during input overruns")
> Signed-off-by: He Zhe <[email protected]>
> ---
> drivers/tty/serial/8250/8250_core.c | 17 +++++++++--------
> 1 file changed, 9 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c
> index 189ab12..e441221 100644
> --- a/drivers/tty/serial/8250/8250_core.c
> +++ b/drivers/tty/serial/8250/8250_core.c
> @@ -1070,15 +1070,16 @@ int serial8250_register_8250_port(struct uart_8250_port *up)
>
> ret = 0;
> }
> - }
>
> - /* Initialise interrupt backoff work if required */
> - if (up->overrun_backoff_time_ms > 0) {
> - uart->overrun_backoff_time_ms = up->overrun_backoff_time_ms;
> - INIT_DELAYED_WORK(&uart->overrun_backoff,
> - serial_8250_overrun_backoff_work);
> - } else {
> - uart->overrun_backoff_time_ms = 0;
> + /* Initialise interrupt backoff work if required */
> + if (up->overrun_backoff_time_ms > 0) {
> + uart->overrun_backoff_time_ms =
> + up->overrun_backoff_time_ms;
> + INIT_DELAYED_WORK(&uart->overrun_backoff,
> + serial_8250_overrun_backoff_work);
> + } else {
> + uart->overrun_backoff_time_ms = 0;
> + }
> }
>
> mutex_unlock(&serial_mutex);
>
Reviewed-by: Darwin Dingel <[email protected]>
I presume this is the same issue reported here:
https://www.spinics.net/lists/linux-serial/msg33114.html
https://lkml.org/lkml/2018/12/22/171
Thanks!
Regards,
Darwin
On 18/01/19 8:49 AM, Darwin Dingel wrote:
> On 17/01/19 10:00 PM, [email protected] wrote:
>> From: He Zhe <[email protected]>
>>
>> The initialization code of interrupt backoff work might reference NULL
>> pointer and cause the following crash, if no port was found.
>>
>> [ 10.017727] CPU 0 Unable to handle kernel paging request at virtual address 000001b0, epc == 807088e0, ra == 8070863c
>> ---- snip ----
>> [ 11.704470] [<807088e0>] serial8250_register_8250_port+0x318/0x4ac
>> [ 11.747251] [<80708d74>] serial8250_probe+0x148/0x1c0
>> [ 11.789301] [<80728450>] platform_drv_probe+0x40/0x94
>> [ 11.830515] [<807264f8>] really_probe+0xf8/0x318
>> [ 11.870876] [<80726b7c>] __driver_attach+0x110/0x12c
>> [ 11.910960] [<80724374>] bus_for_each_dev+0x78/0xcc
>> [ 11.951134] [<80725958>] bus_add_driver+0x200/0x234
>> [ 11.989756] [<807273d8>] driver_register+0x84/0x148
>> [ 12.029832] [<80d72f84>] serial8250_init+0x138/0x198
>> [ 12.070447] [<80100e6c>] do_one_initcall+0x5c/0x2a0
>> [ 12.110104] [<80d3a208>] kernel_init_freeable+0x370/0x484
>> [ 12.150722] [<80a49420>] kernel_init+0x10/0xf8
>> [ 12.191517] [<8010756c>] ret_from_kernel_thread+0x14/0x1c
>>
>> This patch makes sure the initialization code can be reached only if a port
>> is found.
>>
>> Fixes: commit 6d7f677a2afa ("serial: 8250: Rate limit serial port rx interrupts during input overruns")
>> Signed-off-by: He Zhe <[email protected]>
>> ---
>> drivers/tty/serial/8250/8250_core.c | 17 +++++++++--------
>> 1 file changed, 9 insertions(+), 8 deletions(-)
>>
>> diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c
>> index 189ab12..e441221 100644
>> --- a/drivers/tty/serial/8250/8250_core.c
>> +++ b/drivers/tty/serial/8250/8250_core.c
>> @@ -1070,15 +1070,16 @@ int serial8250_register_8250_port(struct uart_8250_port *up)
>>
>> ret = 0;
>> }
>> - }
>>
>> - /* Initialise interrupt backoff work if required */
>> - if (up->overrun_backoff_time_ms > 0) {
>> - uart->overrun_backoff_time_ms = up->overrun_backoff_time_ms;
>> - INIT_DELAYED_WORK(&uart->overrun_backoff,
>> - serial_8250_overrun_backoff_work);
>> - } else {
>> - uart->overrun_backoff_time_ms = 0;
>> + /* Initialise interrupt backoff work if required */
>> + if (up->overrun_backoff_time_ms > 0) {
>> + uart->overrun_backoff_time_ms =
>> + up->overrun_backoff_time_ms;
>> + INIT_DELAYED_WORK(&uart->overrun_backoff,
>> + serial_8250_overrun_backoff_work);
>> + } else {
>> + uart->overrun_backoff_time_ms = 0;
>> + }
>> }
>>
>> mutex_unlock(&serial_mutex);
>>
>
> Reviewed-by: Darwin Dingel <[email protected]>
>
> I presume this is the same issue reported here:
>
> https://www.spinics.net/lists/linux-serial/msg33114.html
> https://lkml.org/lkml/2018/12/22/171
>
>
>
> Thanks!
> Regards,
>
> Darwin
>
Adding Colin and Dan.
Regards,
Darwin
On Thu, Jan 17, 2019 at 05:00:19PM +0800, [email protected] wrote:
> From: He Zhe <[email protected]>
>
> The initialization code of interrupt backoff work might reference NULL
> pointer and cause the following crash, if no port was found.
>
> [ 10.017727] CPU 0 Unable to handle kernel paging request at virtual address 000001b0, epc == 807088e0, ra == 8070863c
> ---- snip ----
> [ 11.704470] [<807088e0>] serial8250_register_8250_port+0x318/0x4ac
> [ 11.747251] [<80708d74>] serial8250_probe+0x148/0x1c0
> [ 11.789301] [<80728450>] platform_drv_probe+0x40/0x94
> [ 11.830515] [<807264f8>] really_probe+0xf8/0x318
> [ 11.870876] [<80726b7c>] __driver_attach+0x110/0x12c
> [ 11.910960] [<80724374>] bus_for_each_dev+0x78/0xcc
> [ 11.951134] [<80725958>] bus_add_driver+0x200/0x234
> [ 11.989756] [<807273d8>] driver_register+0x84/0x148
> [ 12.029832] [<80d72f84>] serial8250_init+0x138/0x198
> [ 12.070447] [<80100e6c>] do_one_initcall+0x5c/0x2a0
> [ 12.110104] [<80d3a208>] kernel_init_freeable+0x370/0x484
> [ 12.150722] [<80a49420>] kernel_init+0x10/0xf8
> [ 12.191517] [<8010756c>] ret_from_kernel_thread+0x14/0x1c
>
> This patch makes sure the initialization code can be reached only if a port
> is found.
>
> Fixes: commit 6d7f677a2afa ("serial: 8250: Rate limit serial port rx interrupts during input overruns")
No need for the "commit" in this string, this can just be written as:
Fixes: 6d7f677a2afa ("serial: 8250: Rate limit serial port rx interrupts during input overruns")
thanks,
greg k-h