From: Colin Ian King colin.king@canonical.com
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 colin.king@canonical.com --- 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 = &init_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 = &init_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 =
On Fri, Aug 16, 2019 at 11:10:11PM +0100, Colin King wrote:
From: Colin Ian King colin.king@canonical.com
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 colin.king@canonical.com
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 = &init_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
On 2019-08-16 6:10 p.m., Colin King wrote:
From: Colin Ian King colin.king@canonical.com
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 colin.king@canonical.com
Reviewed-by: Harry Wentland harry.wentland@amd.com
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 = &init_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 = &init_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 =
On Thu, Aug 22, 2019 at 3:21 PM Harry Wentland hwentlan@amd.com wrote:
On 2019-08-16 6:10 p.m., Colin King wrote:
From: Colin Ian King colin.king@canonical.com
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 colin.king@canonical.com
Reviewed-by: Harry Wentland harry.wentland@amd.com
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 = &init_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 = &init_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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