ANDROID: fix binder change in merge of 4.9.188

The 4.9.188 merge was missing the change to the binder driver associated with the linux-4.9.y commit 16903f1 ("coredump: fix race condition between mmget_not_zero()/get_task_mm() and core dumping"). It was left out because the android-4.9 binder driver has been significantly refactored compared to linux-4.9.y. This patch applies the missing change from that patch to the binder driver. Change-Id: I803e558cb629fedff04b14e23ac9f83e98628ede Fixes: d4fff2d0a879 ("Merge 4.9.188 into android-4.9") Signed-off-by: Todd Kjos <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>
THEBOSS619 · Sep 25, 2019 · a2d74a8 · a2d74a8
1 parent 5cda4db
commit a2d74a8
Showing 1 changed file with 5 additions and 0 deletions.
diff --git a/drivers/android/binder_alloc.c b/drivers/android/binder_alloc.c
@@ -218,6 +218,11 @@ static int binder_update_page_range(struct binder_alloc *alloc, int allocate,
 
 	if (mm) {
 		down_read(&mm->mmap_sem);
+		if (!mmget_still_valid(mm)) {
+			if (allocate == 0)
+				goto free_range;
+			goto err_no_vma;
+		}
 		vma = alloc->vma;
 	}