[PATCH v2] drm/amd/display: fix type mismatch in CalculateDynamicMetadataParameters()

[PATCH v2] drm/amd/display: fix type mismatch in CalculateDynamicMetadataParameters()

[Vitaliy Shevtsov]

There is a type mismatch between what CalculateDynamicMetadataParameters()
takes and what is passed to it. Currently this function accepts several
args as signed long but it's called with unsigned integers. On some systems
where long is 32 bits and one of these input params is greater than INT_MAX
it may cause passing input params as negative values.

Fix this by changing these argument types from long to unsigned int. Also
this will align the function's definition with similar functions in other
dcn* drivers.

Found by Linux Verification Center (linuxtesting.org) with Svace.

Fixes: 6725a88f88a7 ("drm/amd/display: Add DCN3 DML")
Signed-off-by: Vitaliy Shevtsov <v.shevtsov@mt-integration.ru>
---
v2: Change DynamicMetadataLinesBeforeActiveRequired type from unsigned int
    to int as per Alex Hung's observation.
    Add Fixes tag missed by chance.

 .../amd/display/dc/dml/dcn30/display_mode_vba_30.c   | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/dc/dml/dcn30/display_mode_vba_30.c b/drivers/gpu/drm/amd/display/dc/dml/dcn30/display_mode_vba_30.c
index cee1b351e105..f1fe49401bc0 100644
--- a/drivers/gpu/drm/amd/display/dc/dml/dcn30/display_mode_vba_30.c
+++ b/drivers/gpu/drm/amd/display/dc/dml/dcn30/display_mode_vba_30.c
@@ -281,10 +281,10 @@ static void CalculateDynamicMetadataParameters(
 		double DISPCLK,
 		double DCFClkDeepSleep,
 		double PixelClock,
-		long HTotal,
-		long VBlank,
-		long DynamicMetadataTransmittedBytes,
-		long DynamicMetadataLinesBeforeActiveRequired,
+		unsigned int HTotal,
+		unsigned int VBlank,
+		unsigned int DynamicMetadataTransmittedBytes,
+		int DynamicMetadataLinesBeforeActiveRequired,
 		int InterlaceEnable,
 		bool ProgressiveToInterlaceUnitInOPP,
 		double *Tsetup,
@@ -3265,8 +3265,8 @@ static double CalculateWriteBackDelay(
 
 
 static void CalculateDynamicMetadataParameters(int MaxInterDCNTileRepeaters, double DPPCLK, double DISPCLK,
-		double DCFClkDeepSleep, double PixelClock, long HTotal, long VBlank, long DynamicMetadataTransmittedBytes,
-		long DynamicMetadataLinesBeforeActiveRequired, int InterlaceEnable, bool ProgressiveToInterlaceUnitInOPP,
+		double DCFClkDeepSleep, double PixelClock, unsigned int HTotal, unsigned int VBlank, unsigned int DynamicMetadataTransmittedBytes,
+		int DynamicMetadataLinesBeforeActiveRequired, int InterlaceEnable, bool ProgressiveToInterlaceUnitInOPP,
 		double *Tsetup, double *Tdmbf, double *Tdmec, double *Tdmsks)
 {
 	double TotalRepeaterDelayTime = 0;
-- 
2.48.1

Re: [PATCH v2] drm/amd/display: fix type mismatch in CalculateDynamicMetadataParameters()

[Alex Hung]

On 2/26/25 04:10, Vitaliy Shevtsov wrote:
> There is a type mismatch between what CalculateDynamicMetadataParameters()
> takes and what is passed to it. Currently this function accepts several
> args as signed long but it's called with unsigned integers. On some systems
> where long is 32 bits and one of these input params is greater than INT_MAX
> it may cause passing input params as negative values.
> 
> Fix this by changing these argument types from long to unsigned int. Also
> this will align the function's definition with similar functions in other
> dcn* drivers.

The commit description needs to be updated to include int in addition to 
unsigned int too.

> 
> Found by Linux Verification Center (linuxtesting.org) with Svace.
> 
> Fixes: 6725a88f88a7 ("drm/amd/display: Add DCN3 DML")
> Signed-off-by: Vitaliy Shevtsov <v.shevtsov@mt-integration.ru>
> ---
> v2: Change DynamicMetadataLinesBeforeActiveRequired type from unsigned int
>      to int as per Alex Hung's observation.
>      Add Fixes tag missed by chance.
> 
>   .../amd/display/dc/dml/dcn30/display_mode_vba_30.c   | 12 ++++++------
>   1 file changed, 6 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/gpu/drm/amd/display/dc/dml/dcn30/display_mode_vba_30.c b/drivers/gpu/drm/amd/display/dc/dml/dcn30/display_mode_vba_30.c
> index cee1b351e105..f1fe49401bc0 100644
> --- a/drivers/gpu/drm/amd/display/dc/dml/dcn30/display_mode_vba_30.c
> +++ b/drivers/gpu/drm/amd/display/dc/dml/dcn30/display_mode_vba_30.c
> @@ -281,10 +281,10 @@ static void CalculateDynamicMetadataParameters(
>   		double DISPCLK,
>   		double DCFClkDeepSleep,
>   		double PixelClock,
> -		long HTotal,
> -		long VBlank,
> -		long DynamicMetadataTransmittedBytes,
> -		long DynamicMetadataLinesBeforeActiveRequired,
> +		unsigned int HTotal,
> +		unsigned int VBlank,
> +		unsigned int DynamicMetadataTransmittedBytes,
> +		int DynamicMetadataLinesBeforeActiveRequired,
>   		int InterlaceEnable,
>   		bool ProgressiveToInterlaceUnitInOPP,
>   		double *Tsetup,
> @@ -3265,8 +3265,8 @@ static double CalculateWriteBackDelay(
>   
>   
>   static void CalculateDynamicMetadataParameters(int MaxInterDCNTileRepeaters, double DPPCLK, double DISPCLK,
> -		double DCFClkDeepSleep, double PixelClock, long HTotal, long VBlank, long DynamicMetadataTransmittedBytes,
> -		long DynamicMetadataLinesBeforeActiveRequired, int InterlaceEnable, bool ProgressiveToInterlaceUnitInOPP,
> +		double DCFClkDeepSleep, double PixelClock, unsigned int HTotal, unsigned int VBlank, unsigned int DynamicMetadataTransmittedBytes,
> +		int DynamicMetadataLinesBeforeActiveRequired, int InterlaceEnable, bool ProgressiveToInterlaceUnitInOPP,
>   		double *Tsetup, double *Tdmbf, double *Tdmec, double *Tdmsks)
>   {
>   	double TotalRepeaterDelayTime = 0;