[PATCH 4.14 46/75] staging: rtl8822be: Keep array subscript no lower than zero

[Greg Kroah-Hartman]

4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Larry Finger <Larry.Finger@xxxxxxxxxxxx>


[ Upstream commit 43d15c2013130a9fa230c2f5203aca818ae0bb86 ]

The kbuild test robot reports the following:
   drivers/staging//rtlwifi/phydm/phydm_dig.c: In function 'odm_pause_dig':
   drivers/staging//rtlwifi/phydm/phydm_dig.c:494:45: warning: array subscript is below array bounds [-Warray-bounds]
      odm_write_dig(dm, dig_tab->pause_dig_value[max_level]);

This condition is caused when a loop falls through. The fix is to pin
max_level to be >= 0.

Signed-off-by: Larry Finger <Larry.Finger@xxxxxxxxxxxx>
c: kbuild test robot <fengguang.wu@xxxxxxxxx>
Fixes: 9ce99b04b5b82fdf11e4c76b60a5f82c1e541297 staging: r8822be: Add phydm mini driver
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/staging/rtlwifi/phydm/phydm_dig.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/staging/rtlwifi/phydm/phydm_dig.c
+++ b/drivers/staging/rtlwifi/phydm/phydm_dig.c
@@ -490,6 +490,8 @@ void odm_pause_dig(void *dm_void, enum p
 				break;
 		}
 
+		/* pin max_level to be >= 0 */
+		max_level = max_t(s8, 0, max_level);
 		/* write IGI of lower level */
 		odm_write_dig(dm, dig_tab->pause_dig_value[max_level]);
 		ODM_RT_TRACE(dm, ODM_COMP_DIG,