drm/xe/xe_survivability: Add index bound check

Fix static analysis tool reported issue. Add index bound check before
accessing info array to prevent out of bound.

Fixes: f4e9fc967afd ("drm/xe/xe_survivability: Redesign survivability mode")
Signed-off-by: Riana Tauro <riana.tauro@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patch.msgid.link/20251219105224.871930-6-riana.tauro@intel.com
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

diff --git a/drivers/gpu/drm/xe/xe_survivability_mode.c b/drivers/gpu/drm/xe/xe_survivability_mode.c
index 162b57a9ab943c3bc251340f1f4d899ad011e456..4c716182ad3b3ac5c9ac71673b0bebb770406205 100644 (file)
--- a/drivers/gpu/drm/xe/xe_survivability_mode.c
+++ b/drivers/gpu/drm/xe/xe_survivability_mode.c
@@ -251,10 +251,14 @@ static umode_t survivability_info_attrs_visible(struct kobject *kobj, struct att
        struct xe_survivability *survivability = &xe->survivability;
        u32 *info = survivability->info;
 
-       /* FDO mode is visible only when supported */
-       if (idx >= MAX_SCRATCH_REG && survivability->version >= 2)
+       /*
+        * Last index in survivability_info_attrs is fdo mode and is applicable only in
+        * version 2 of survivability mode
+        */
+       if (idx == MAX_SCRATCH_REG && survivability->version >= 2)
                return 0400;
-       else if (info[idx])
+
+       if (idx < MAX_SCRATCH_REG && info[idx])
                return 0400;
 
        return 0;