* [PATCH] mtd: gpmi: fix raw_buffer pointer double free issue
@ 2016-04-04 17:25 Han Xu
2016-04-04 18:18 ` Richard Weinberger
0 siblings, 1 reply; 5+ messages in thread
From: Han Xu @ 2016-04-04 17:25 UTC (permalink / raw)
To: han.xu, boris.brezillon, richard, dwmw2, computersforpeace
Cc: linux-mtd, linux-kernel
fix the raw_buffer pointer double free issue found by coverify.
Signed-off-by: Han Xu <han.xu@nxp.com>
---
drivers/mtd/nand/gpmi-nand/gpmi-nand.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/mtd/nand/gpmi-nand/gpmi-nand.c b/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
index 8122c69..dcb60b0 100644
--- a/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
+++ b/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
@@ -797,6 +797,7 @@ static void gpmi_free_dma_buffer(struct gpmi_nand_data *this)
this->cmd_buffer = NULL;
this->data_buffer_dma = NULL;
+ this->raw_buffer = NULL;
this->page_buffer_virt = NULL;
this->page_buffer_size = 0;
}
--
1.9.1
^ permalink raw reply related [flat|nested] 5+ messages in thread
* Re: [PATCH] mtd: gpmi: fix raw_buffer pointer double free issue
2016-04-04 17:25 [PATCH] mtd: gpmi: fix raw_buffer pointer double free issue Han Xu
@ 2016-04-04 18:18 ` Richard Weinberger
0 siblings, 0 replies; 5+ messages in thread
From: Richard Weinberger @ 2016-04-04 18:18 UTC (permalink / raw)
To: Han Xu, boris.brezillon, dwmw2, computersforpeace; +Cc: linux-mtd, linux-kernel
Am 04.04.2016 um 19:25 schrieb Han Xu:
> fix the raw_buffer pointer double free issue found by coverify.
Can you please include the coverity message in you changelog?
> Signed-off-by: Han Xu <han.xu@nxp.com>
> ---
> drivers/mtd/nand/gpmi-nand/gpmi-nand.c | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/drivers/mtd/nand/gpmi-nand/gpmi-nand.c b/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
> index 8122c69..dcb60b0 100644
> --- a/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
> +++ b/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
> @@ -797,6 +797,7 @@ static void gpmi_free_dma_buffer(struct gpmi_nand_data *this)
>
> this->cmd_buffer = NULL;
> this->data_buffer_dma = NULL;
> + this->raw_buffer = NULL;
> this->page_buffer_virt = NULL;
> this->page_buffer_size = 0;
So, gpmi_free_dma_buffer() is called twice and therefore we need to NULL all
these pointers?
Thanks,
//richard
^ permalink raw reply [flat|nested] 5+ messages in thread
* [PATCH] mtd: gpmi: fix raw_buffer pointer double free issue
@ 2016-04-04 20:41 Han Xu
2016-04-04 21:31 ` Richard Weinberger
2016-04-05 15:43 ` Boris Brezillon
0 siblings, 2 replies; 5+ messages in thread
From: Han Xu @ 2016-04-04 20:41 UTC (permalink / raw)
To: han.xu, boris.brezillon, richard, dwmw2, computersforpeace
Cc: linux-mtd, linux-kernel
fix the raw_buffer pointer double free issue found by coverify.
CID 18344 (#2 of 2): Double free (USE_AFTER_FREE)
3. double_free: Calling gpmi_alloc_dma_buffer frees pointer
this->raw_buffer which has already been freed
Signed-off-by: Han Xu <han.xu@nxp.com>
---
changes in v2:
- add coverity check log
---
drivers/mtd/nand/gpmi-nand/gpmi-nand.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/mtd/nand/gpmi-nand/gpmi-nand.c b/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
index 8122c69..dcb60b0 100644
--- a/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
+++ b/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
@@ -797,6 +797,7 @@ static void gpmi_free_dma_buffer(struct gpmi_nand_data *this)
this->cmd_buffer = NULL;
this->data_buffer_dma = NULL;
+ this->raw_buffer = NULL;
this->page_buffer_virt = NULL;
this->page_buffer_size = 0;
}
--
1.9.1
^ permalink raw reply related [flat|nested] 5+ messages in thread
* Re: [PATCH] mtd: gpmi: fix raw_buffer pointer double free issue
2016-04-04 20:41 Han Xu
@ 2016-04-04 21:31 ` Richard Weinberger
2016-04-05 15:43 ` Boris Brezillon
1 sibling, 0 replies; 5+ messages in thread
From: Richard Weinberger @ 2016-04-04 21:31 UTC (permalink / raw)
To: Han Xu, boris.brezillon, dwmw2, computersforpeace; +Cc: linux-mtd, linux-kernel
Am 04.04.2016 um 22:41 schrieb Han Xu:
> fix the raw_buffer pointer double free issue found by coverify.
>
> CID 18344 (#2 of 2): Double free (USE_AFTER_FREE)
> 3. double_free: Calling gpmi_alloc_dma_buffer frees pointer
> this->raw_buffer which has already been freed
>
> Signed-off-by: Han Xu <han.xu@nxp.com>
> ---
>
> changes in v2:
> - add coverity check log
> ---
> drivers/mtd/nand/gpmi-nand/gpmi-nand.c | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/drivers/mtd/nand/gpmi-nand/gpmi-nand.c b/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
> index 8122c69..dcb60b0 100644
> --- a/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
> +++ b/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
> @@ -797,6 +797,7 @@ static void gpmi_free_dma_buffer(struct gpmi_nand_data *this)
>
> this->cmd_buffer = NULL;
> this->data_buffer_dma = NULL;
> + this->raw_buffer = NULL;
> this->page_buffer_virt = NULL;
> this->page_buffer_size = 0;
Reviewed-by: Richard Weinberger <richard@nod.at>
Aside of that, the driver should IMHO be fixed to not call
gpmi_free_dma_buffer() multiple times on the same buffer...
Thanks,
//richard
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH] mtd: gpmi: fix raw_buffer pointer double free issue
2016-04-04 20:41 Han Xu
2016-04-04 21:31 ` Richard Weinberger
@ 2016-04-05 15:43 ` Boris Brezillon
1 sibling, 0 replies; 5+ messages in thread
From: Boris Brezillon @ 2016-04-05 15:43 UTC (permalink / raw)
To: Han Xu; +Cc: richard, dwmw2, computersforpeace, linux-mtd, linux-kernel
On Mon, 4 Apr 2016 15:41:29 -0500
Han Xu <han.xu@nxp.com> wrote:
> fix the raw_buffer pointer double free issue found by coverify.
>
> CID 18344 (#2 of 2): Double free (USE_AFTER_FREE)
> 3. double_free: Calling gpmi_alloc_dma_buffer frees pointer
> this->raw_buffer which has already been freed
>
> Signed-off-by: Han Xu <han.xu@nxp.com>
Applied.
Thanks,
Boris
> ---
>
> changes in v2:
> - add coverity check log
> ---
> drivers/mtd/nand/gpmi-nand/gpmi-nand.c | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/drivers/mtd/nand/gpmi-nand/gpmi-nand.c b/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
> index 8122c69..dcb60b0 100644
> --- a/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
> +++ b/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
> @@ -797,6 +797,7 @@ static void gpmi_free_dma_buffer(struct gpmi_nand_data *this)
>
> this->cmd_buffer = NULL;
> this->data_buffer_dma = NULL;
> + this->raw_buffer = NULL;
> this->page_buffer_virt = NULL;
> this->page_buffer_size = 0;
> }
--
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com
^ permalink raw reply [flat|nested] 5+ messages in thread
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2016-04-04 21:31 ` Richard Weinberger
2016-04-05 15:43 ` Boris Brezillon
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