* [PATCH] staging: greybus: Fix null pointer dereference
@ 2018-08-24 4:07 Ding Xiang
2018-08-24 6:29 ` Johan Hovold
2018-08-24 10:27 ` Dan Carpenter
0 siblings, 2 replies; 4+ messages in thread
From: Ding Xiang @ 2018-08-24 4:07 UTC (permalink / raw)
To: johan, elder, gregkh, greybus-dev, devel, linux-kernel
If fw is null then fw->size will trigger null pointer dereference
Signed-off-by: Ding Xiang <dingxiang@cmss.chinamobile.com>
---
drivers/staging/greybus/bootrom.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/staging/greybus/bootrom.c b/drivers/staging/greybus/bootrom.c
index e85ffae..3af28a0 100644
--- a/drivers/staging/greybus/bootrom.c
+++ b/drivers/staging/greybus/bootrom.c
@@ -297,7 +297,7 @@ static int gb_bootrom_get_firmware(struct gb_operation *op)
queue_work:
/* Refresh timeout */
- if (!ret && (offset + size == fw->size))
+ if (!ret && fw && (offset + size == fw->size))
next_request = NEXT_REQ_READY_TO_BOOT;
else
next_request = NEXT_REQ_GET_FIRMWARE;
--
1.8.3.1
^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: [PATCH] staging: greybus: Fix null pointer dereference
2018-08-24 4:07 [PATCH] staging: greybus: Fix null pointer dereference Ding Xiang
@ 2018-08-24 6:29 ` Johan Hovold
2018-08-24 10:08 ` Ding Xiang
2018-08-24 10:27 ` Dan Carpenter
1 sibling, 1 reply; 4+ messages in thread
From: Johan Hovold @ 2018-08-24 6:29 UTC (permalink / raw)
To: Ding Xiang
Cc: johan, elder, gregkh, greybus-dev, devel, linux-kernel,
Viresh Kumar
On Fri, Aug 24, 2018 at 12:07:11AM -0400, Ding Xiang wrote:
> If fw is null then fw->size will trigger null pointer dereference
>
> Signed-off-by: Ding Xiang <dingxiang@cmss.chinamobile.com>
> ---
> drivers/staging/greybus/bootrom.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/staging/greybus/bootrom.c b/drivers/staging/greybus/bootrom.c
> index e85ffae..3af28a0 100644
> --- a/drivers/staging/greybus/bootrom.c
> +++ b/drivers/staging/greybus/bootrom.c
> @@ -297,7 +297,7 @@ static int gb_bootrom_get_firmware(struct gb_operation *op)
>
> queue_work:
> /* Refresh timeout */
> - if (!ret && (offset + size == fw->size))
> + if (!ret && fw && (offset + size == fw->size))
> next_request = NEXT_REQ_READY_TO_BOOT;
> else
> next_request = NEXT_REQ_GET_FIRMWARE;
How could fw be NULL when ret is 0 here?
It may not be as obvious as one might have wished, but the current code
looks correct to me.
Johan
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] staging: greybus: Fix null pointer dereference
2018-08-24 6:29 ` Johan Hovold
@ 2018-08-24 10:08 ` Ding Xiang
0 siblings, 0 replies; 4+ messages in thread
From: Ding Xiang @ 2018-08-24 10:08 UTC (permalink / raw)
To: Johan Hovold
Cc: elder, gregkh, greybus-dev, devel, linux-kernel, Viresh Kumar
Hi, Johan
sorry, it's my fault.
On 8/24/2018 2:29 PM, Johan Hovold wrote:
> On Fri, Aug 24, 2018 at 12:07:11AM -0400, Ding Xiang wrote:
>> If fw is null then fw->size will trigger null pointer dereference
>>
>> Signed-off-by: Ding Xiang <dingxiang@cmss.chinamobile.com>
>> ---
>> drivers/staging/greybus/bootrom.c | 2 +-
>> 1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/staging/greybus/bootrom.c b/drivers/staging/greybus/bootrom.c
>> index e85ffae..3af28a0 100644
>> --- a/drivers/staging/greybus/bootrom.c
>> +++ b/drivers/staging/greybus/bootrom.c
>> @@ -297,7 +297,7 @@ static int gb_bootrom_get_firmware(struct gb_operation *op)
>>
>> queue_work:
>> /* Refresh timeout */
>> - if (!ret && (offset + size == fw->size))
>> + if (!ret && fw && (offset + size == fw->size))
>> next_request = NEXT_REQ_READY_TO_BOOT;
>> else
>> next_request = NEXT_REQ_GET_FIRMWARE;
> How could fw be NULL when ret is 0 here?
>
> It may not be as obvious as one might have wished, but the current code
> looks correct to me.
>
> Johan
>
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] staging: greybus: Fix null pointer dereference
2018-08-24 4:07 [PATCH] staging: greybus: Fix null pointer dereference Ding Xiang
2018-08-24 6:29 ` Johan Hovold
@ 2018-08-24 10:27 ` Dan Carpenter
1 sibling, 0 replies; 4+ messages in thread
From: Dan Carpenter @ 2018-08-24 10:27 UTC (permalink / raw)
To: Ding Xiang; +Cc: johan, elder, gregkh, greybus-dev, devel, linux-kernel
On Fri, Aug 24, 2018 at 12:07:11AM -0400, Ding Xiang wrote:
> If fw is null then fw->size will trigger null pointer dereference
>
> Signed-off-by: Ding Xiang <dingxiang@cmss.chinamobile.com>
> ---
> drivers/staging/greybus/bootrom.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/staging/greybus/bootrom.c b/drivers/staging/greybus/bootrom.c
> index e85ffae..3af28a0 100644
> --- a/drivers/staging/greybus/bootrom.c
> +++ b/drivers/staging/greybus/bootrom.c
> @@ -297,7 +297,7 @@ static int gb_bootrom_get_firmware(struct gb_operation *op)
>
> queue_work:
> /* Refresh timeout */
> - if (!ret && (offset + size == fw->size))
> + if (!ret && fw && (offset + size == fw->size))
That is impossible. If "ret" is zero that implies "fw" is a valid
pointer.
regards,
dan carpenter
^ permalink raw reply [flat|nested] 4+ messages in thread
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2018-08-24 4:07 [PATCH] staging: greybus: Fix null pointer dereference Ding Xiang
2018-08-24 6:29 ` Johan Hovold
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2018-08-24 10:27 ` Dan Carpenter
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