This reverts commit bbb19ca082ce27ce60ca65be016a951806ea947c.
The commit message is for a different patch. Reverting and then adding the same patch back with the correct commit message.
Cc: stable stable@vger.kernel.org # 5.0 Signed-off-by: Todd Kjos tkjos@google.com --- drivers/android/binder_alloc.c | 18 ++++++++++-------- 1 file changed, 10 insertions(+), 8 deletions(-)
diff --git a/drivers/android/binder_alloc.c b/drivers/android/binder_alloc.c index a6e556bf62dff..022cd80e80cc3 100644 --- a/drivers/android/binder_alloc.c +++ b/drivers/android/binder_alloc.c @@ -959,13 +959,14 @@ enum lru_status binder_alloc_free_page(struct list_head *item,
index = page - alloc->pages; page_addr = (uintptr_t)alloc->buffer + index * PAGE_SIZE; - - mm = alloc->vma_vm_mm; - if (!mmget_not_zero(mm)) - goto err_mmget; - if (!down_write_trylock(&mm->mmap_sem)) - goto err_down_write_mmap_sem_failed; vma = binder_alloc_get_vma(alloc); + if (vma) { + if (!mmget_not_zero(alloc->vma_vm_mm)) + goto err_mmget; + mm = alloc->vma_vm_mm; + if (!down_write_trylock(&mm->mmap_sem)) + goto err_down_write_mmap_sem_failed; + }
list_lru_isolate(lru, item); spin_unlock(lock); @@ -978,9 +979,10 @@ enum lru_status binder_alloc_free_page(struct list_head *item, PAGE_SIZE);
trace_binder_unmap_user_end(alloc, index); + + up_write(&mm->mmap_sem); + mmput(mm); } - up_write(&mm->mmap_sem); - mmput(mm);
trace_binder_unmap_kernel_start(alloc, index);