diff mbox

mtd: gpmi: fix raw_buffer pointer double free issue

Message ID 1459802489-30382-1-git-send-email-han.xu@nxp.com
State Accepted
Headers show

Commit Message

Han Xu April 4, 2016, 8:41 p.m. UTC 
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(+)

Comments

Richard Weinberger April 4, 2016, 9:31 p.m. UTC | #1 
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
Boris Brezillon April 5, 2016, 3:43 p.m. UTC | #2 
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;
>  }
diff mbox

Patch

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;
 }