2019-05-07 19:45:01

by Moritz Fischer

Subject: [PATCH v2] fpga: zynqmp-fpga: Correctly handle error pointer

Fixes the following static checker errors:

drivers/fpga/zynqmp-fpga.c:50 zynqmp_fpga_ops_write()
error: 'eemi_ops' dereferencing possible ERR_PTR()

drivers/fpga/zynqmp-fpga.c:84 zynqmp_fpga_ops_state()
error: 'eemi_ops' dereferencing possible ERR_PTR()

Note: This does not handle the EPROBE_DEFER value in a
special manner.

Fixes commit c09f7471127e ("fpga manager: Adding FPGA Manager support for
Xilinx zynqmp")
Reported-by: Dan Carpenter <[email protected]>
Signed-off-by: Moritz Fischer <[email protected]>
---

Changes from v1:
- Address Alan's feedback regarding handling both occurences.

---
drivers/fpga/zynqmp-fpga.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/fpga/zynqmp-fpga.c b/drivers/fpga/zynqmp-fpga.c
index f7cbaadf49ab..b8a88d21d038 100644
--- a/drivers/fpga/zynqmp-fpga.c
+++ b/drivers/fpga/zynqmp-fpga.c
@@ -47,7 +47,7 @@ static int zynqmp_fpga_ops_write(struct fpga_manager *mgr,
char *kbuf;
int ret;

- if (!eemi_ops || !eemi_ops->fpga_load)
+ if (IS_ERR_OR_NULL(eemi_ops) || !eemi_ops->fpga_load)
return -ENXIO;

priv = mgr->priv;
@@ -81,7 +81,7 @@ static enum fpga_mgr_states zynqmp_fpga_ops_state(struct fpga_manager *mgr)
const struct zynqmp_eemi_ops *eemi_ops = zynqmp_pm_get_eemi_ops();
u32 status;

- if (!eemi_ops || !eemi_ops->fpga_get_status)
+ if (IS_ERR_OR_NULL(eemi_ops) || !eemi_ops->fpga_get_status)
return FPGA_MGR_STATE_UNKNOWN;

eemi_ops->fpga_get_status(&status);
--
2.21.0

2019-05-07 20:12:17

by Alan Tull

Subject: Re: [PATCH v2] fpga: zynqmp-fpga: Correctly handle error pointer

On Tue, May 7, 2019 at 2:43 PM Moritz Fischer <[email protected]> wrote:
>
> Fixes the following static checker errors:
>
> drivers/fpga/zynqmp-fpga.c:50 zynqmp_fpga_ops_write()
> error: 'eemi_ops' dereferencing possible ERR_PTR()
>
> drivers/fpga/zynqmp-fpga.c:84 zynqmp_fpga_ops_state()
> error: 'eemi_ops' dereferencing possible ERR_PTR()
>
> Note: This does not handle the EPROBE_DEFER value in a
> special manner.
>
> Fixes commit c09f7471127e ("fpga manager: Adding FPGA Manager support for
> Xilinx zynqmp")
> Reported-by: Dan Carpenter <[email protected]>
> Signed-off-by: Moritz Fischer <[email protected]>

Acked-by: Alan Tull <[email protected]>

Thanks!
Alan

> ---
>
> Changes from v1:
> - Address Alan's feedback regarding handling both occurences.
>
> ---
> drivers/fpga/zynqmp-fpga.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/fpga/zynqmp-fpga.c b/drivers/fpga/zynqmp-fpga.c
> index f7cbaadf49ab..b8a88d21d038 100644
> --- a/drivers/fpga/zynqmp-fpga.c
> +++ b/drivers/fpga/zynqmp-fpga.c
> @@ -47,7 +47,7 @@ static int zynqmp_fpga_ops_write(struct fpga_manager *mgr,
> char *kbuf;
> int ret;
>
> - if (!eemi_ops || !eemi_ops->fpga_load)
> + if (IS_ERR_OR_NULL(eemi_ops) || !eemi_ops->fpga_load)
> return -ENXIO;
>
> priv = mgr->priv;
> @@ -81,7 +81,7 @@ static enum fpga_mgr_states zynqmp_fpga_ops_state(struct fpga_manager *mgr)
> const struct zynqmp_eemi_ops *eemi_ops = zynqmp_pm_get_eemi_ops();
> u32 status;
>
> - if (!eemi_ops || !eemi_ops->fpga_get_status)
> + if (IS_ERR_OR_NULL(eemi_ops) || !eemi_ops->fpga_get_status)
> return FPGA_MGR_STATE_UNKNOWN;
>
> eemi_ops->fpga_get_status(&status);
> --
> 2.21.0
>