Re: [PATCH][drm-next] drm/amd/display: fix a potential null pointer dereference
On Thu, Aug 22, 2019 at 3:21 PM Harry Wentland wrote:
>
> On 2019-08-16 6:10 p.m., Colin King wrote:
> > From: Colin Ian King
> >
> > Currently the pointer init_data is dereferenced on the assignment
> > of fw_info before init_data is sanity checked to see if it is null.
> > Fix te potential null pointer dereference on init_data by only
> > performing dereference after it is null checked.
> >
> > Addresses-Coverity: ("Dereference before null check")
> > Fixes: 9adc8050bf3c ("drm/amd/display: make firmware info only load once
> > during dc_bios create")
> > Signed-off-by: Colin Ian King
>
> Reviewed-by: Harry Wentland
>
Applied. Thanks!
Alex
> Harry
>
> > ---
> > drivers/gpu/drm/amd/display/dc/dce/dce_clock_source.c | 3 ++-
> > 1 file changed, 2 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/gpu/drm/amd/display/dc/dce/dce_clock_source.c
> > b/drivers/gpu/drm/amd/display/dc/dce/dce_clock_source.c
> > index bee81bf288be..926954c804a6 100644
> > --- a/drivers/gpu/drm/amd/display/dc/dce/dce_clock_source.c
> > +++ b/drivers/gpu/drm/amd/display/dc/dce/dce_clock_source.c
> > @@ -1235,7 +1235,7 @@ static bool calc_pll_max_vco_construct(
> > struct calc_pll_clock_source_init_data *init_data)
> > {
> > uint32_t i;
> > - struct dc_firmware_info *fw_info = _data->bp->fw_info;
> > + struct dc_firmware_info *fw_info;
> > if (calc_pll_cs == NULL ||
> > init_data == NULL ||
> > init_data->bp == NULL)
> > @@ -1244,6 +1244,7 @@ static bool calc_pll_max_vco_construct(
> > if (init_data->bp->fw_info_valid)
> > return false;
> >
> > + fw_info = _data->bp->fw_info;
> > calc_pll_cs->ctx = init_data->ctx;
> > calc_pll_cs->ref_freq_khz = fw_info->pll_info.crystal_frequency;
> > calc_pll_cs->min_vco_khz =
> >
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Re: [PATCH][drm-next] drm/amd/display: fix a potential null pointer dereference
On 2019-08-16 6:10 p.m., Colin King wrote:
> From: Colin Ian King
>
> Currently the pointer init_data is dereferenced on the assignment
> of fw_info before init_data is sanity checked to see if it is null.
> Fix te potential null pointer dereference on init_data by only
> performing dereference after it is null checked.
>
> Addresses-Coverity: ("Dereference before null check")
> Fixes: 9adc8050bf3c ("drm/amd/display: make firmware info only load once
> during dc_bios create")
> Signed-off-by: Colin Ian King
Reviewed-by: Harry Wentland
Harry
> ---
> drivers/gpu/drm/amd/display/dc/dce/dce_clock_source.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/amd/display/dc/dce/dce_clock_source.c
> b/drivers/gpu/drm/amd/display/dc/dce/dce_clock_source.c
> index bee81bf288be..926954c804a6 100644
> --- a/drivers/gpu/drm/amd/display/dc/dce/dce_clock_source.c
> +++ b/drivers/gpu/drm/amd/display/dc/dce/dce_clock_source.c
> @@ -1235,7 +1235,7 @@ static bool calc_pll_max_vco_construct(
> struct calc_pll_clock_source_init_data *init_data)
> {
> uint32_t i;
> - struct dc_firmware_info *fw_info = _data->bp->fw_info;
> + struct dc_firmware_info *fw_info;
> if (calc_pll_cs == NULL ||
> init_data == NULL ||
> init_data->bp == NULL)
> @@ -1244,6 +1244,7 @@ static bool calc_pll_max_vco_construct(
> if (init_data->bp->fw_info_valid)
> return false;
>
> + fw_info = _data->bp->fw_info;
> calc_pll_cs->ctx = init_data->ctx;
> calc_pll_cs->ref_freq_khz = fw_info->pll_info.crystal_frequency;
> calc_pll_cs->min_vco_khz =
>
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Re: [PATCH][drm-next] drm/amd/display: fix a potential null pointer dereference
On Fri, Aug 16, 2019 at 11:10:11PM +0100, Colin King wrote:
> From: Colin Ian King
>
> Currently the pointer init_data is dereferenced on the assignment
> of fw_info before init_data is sanity checked to see if it is null.
> Fix te potential null pointer dereference on init_data by only
> performing dereference after it is null checked.
>
> Addresses-Coverity: ("Dereference before null check")
> Fixes: 9adc8050bf3c ("drm/amd/display: make firmware info only load once
> during dc_bios create")
> Signed-off-by: Colin Ian King
> ---
> drivers/gpu/drm/amd/display/dc/dce/dce_clock_source.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/amd/display/dc/dce/dce_clock_source.c
> b/drivers/gpu/drm/amd/display/dc/dce/dce_clock_source.c
> index bee81bf288be..926954c804a6 100644
> --- a/drivers/gpu/drm/amd/display/dc/dce/dce_clock_source.c
> +++ b/drivers/gpu/drm/amd/display/dc/dce/dce_clock_source.c
> @@ -1235,7 +1235,7 @@ static bool calc_pll_max_vco_construct(
> struct calc_pll_clock_source_init_data *init_data)
> {
> uint32_t i;
> - struct dc_firmware_info *fw_info = _data->bp->fw_info;
> + struct dc_firmware_info *fw_info;
> if (calc_pll_cs == NULL ||
> init_data == NULL ||
> init_data->bp == NULL)
init_data can't be NULL. I'm mostly pointing this out because that NULL
check is written so higgledy-piggledy. At first I thought this was
staging code so I was planning to ignore the patch. :P
regards,
dan carpenter
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