[PATCH] drm/xe: Protect devcoredump access after unbind
Rodrigo Vivi
rodrigo.vivi at intel.com
Wed Apr 3 19:50:44 UTC 2024
While we don't have the full flow protection when devcoredump
is accessed after device unbind. Let's at least for now
protect against null dereference:
[ 422.766508] KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
[ 423.119584] RIP: 0010:xe_vm_snapshot_free+0x30/0x180 [xe]
While at it, I also fixed a non-standard code-declaration block
on the similar function of xe_guc_submit.
v2: - Use IS_ERR_OR_NULL (Nirmoy)
- Expand to other functions
Cc: José Roberto de Souza <jose.souza at intel.com>
Cc: Nirmoy Das <nirmoy.das at intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi at intel.com>
---
drivers/gpu/drm/xe/xe_guc_submit.c | 1 +
drivers/gpu/drm/xe/xe_vm.c | 6 +++---
2 files changed, 4 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/xe/xe_guc_submit.c b/drivers/gpu/drm/xe/xe_guc_submit.c
index f42f1b567067..6e32f9ce4eb5 100644
--- a/drivers/gpu/drm/xe/xe_guc_submit.c
+++ b/drivers/gpu/drm/xe/xe_guc_submit.c
@@ -1961,6 +1961,7 @@ xe_guc_exec_queue_snapshot_print(struct xe_guc_submit_exec_queue_snapshot *snaps
void xe_guc_exec_queue_snapshot_free(struct xe_guc_submit_exec_queue_snapshot *snapshot)
{
int i;
+
if (!snapshot)
return;
diff --git a/drivers/gpu/drm/xe/xe_vm.c b/drivers/gpu/drm/xe/xe_vm.c
index f4bfb2705956..2a431690d245 100644
--- a/drivers/gpu/drm/xe/xe_vm.c
+++ b/drivers/gpu/drm/xe/xe_vm.c
@@ -3426,7 +3426,7 @@ struct xe_vm_snapshot *xe_vm_snapshot_capture(struct xe_vm *vm)
void xe_vm_snapshot_capture_delayed(struct xe_vm_snapshot *snap)
{
- if (IS_ERR(snap))
+ if (IS_ERR_OR_NULL(snap))
return;
for (int i = 0; i < snap->num_snaps; i++) {
@@ -3483,7 +3483,7 @@ void xe_vm_snapshot_print(struct xe_vm_snapshot *snap, struct drm_printer *p)
{
unsigned long i, j;
- if (IS_ERR(snap)) {
+ if (IS_ERR_OR_NULL(snap)) {
drm_printf(p, "[0].error: %li\n", PTR_ERR(snap));
return;
}
@@ -3514,7 +3514,7 @@ void xe_vm_snapshot_free(struct xe_vm_snapshot *snap)
{
unsigned long i;
- if (IS_ERR(snap))
+ if (IS_ERR_OR_NULL(snap))
return;
for (i = 0; i < snap->num_snaps; i++) {
--
2.44.0
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