[PATCH v2] drm/xe: use krealloc_array to prevent integer overflow

[PATCH v2] drm/xe: use krealloc_array to prevent integer overflow

[Baoli.Zhang]

Replace the use of krealloc() with krealloc_array() in xe driver to
mitigate the risk of integer overflow during memory allocation size
calculation.

Signed-off-by: Baoli.Zhang <baoli.zhang@linux.intel.com>
Signed-off-by: Junxiao.Chang <junxiao.chang@intel.com>
---
Changes in v2:
- Adjust continuation-line indentation in xe_vm_madvise.c (no functional change).

v1: https://patchwork.freedesktop.org/patch/713422/?series=163696&rev=1

 drivers/gpu/drm/xe/xe_configfs.c   | 2 +-
 drivers/gpu/drm/xe/xe_vm_madvise.c | 7 ++++---
 2 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/xe/xe_configfs.c b/drivers/gpu/drm/xe/xe_configfs.c
index 7fd07d1280bb1..4cf903c904ba0 100644
--- a/drivers/gpu/drm/xe/xe_configfs.c
+++ b/drivers/gpu/drm/xe/xe_configfs.c
@@ -766,7 +766,7 @@ static ssize_t wa_bb_store(struct wa_bb wa_bb[static XE_ENGINE_CLASS_MAX],
 	 * 2. Allocate a u32 array and set the pointers to the right positions
 	 * according to the length of each class' wa_bb
 	 */
-	tmp = krealloc(wa_bb[0].cs, count * sizeof(u32), GFP_KERNEL);
+	tmp = krealloc_array(wa_bb[0].cs, count, sizeof(u32), GFP_KERNEL);
 	if (!tmp)
 		return -ENOMEM;
 
diff --git a/drivers/gpu/drm/xe/xe_vm_madvise.c b/drivers/gpu/drm/xe/xe_vm_madvise.c
index bc39a9a9790c3..c90fea2b3d808 100644
--- a/drivers/gpu/drm/xe/xe_vm_madvise.c
+++ b/drivers/gpu/drm/xe/xe_vm_madvise.c
@@ -63,9 +63,10 @@ static int get_vmas(struct xe_vm *vm, struct xe_vmas_in_madvise_range *madvise_r
 
 		if (madvise_range->num_vmas == max_vmas) {
 			max_vmas <<= 1;
-			__vmas = krealloc(madvise_range->vmas,
-					  max_vmas * sizeof(*madvise_range->vmas),
-					  GFP_KERNEL);
+			__vmas = krealloc_array(madvise_range->vmas,
+						max_vmas,
+						sizeof(*madvise_range->vmas),
+						GFP_KERNEL);
 			if (!__vmas) {
 				kfree(madvise_range->vmas);
 				return -ENOMEM;
-- 
2.43.0