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Revert "binder: fix handling of misaligned binder object"

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This reverts commit 6bf7d3c5c0.

The commit message is for a different patch. Reverting and then adding
the same patch back with the correct commit message.

Reported-by: Ben Hutchings <ben.hutchings@codethink.co.uk>
Cc: stable <stable@vger.kernel.org> # 4.19
Signed-off-by: Todd Kjos <tkjos@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Todd Kjos 2019-06-05 09:38:24 -07:00 committed by Greg Kroah-Hartman
parent 385dab299c
commit 137c838f17
1 changed files with 10 additions and 8 deletions
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18
drivers/android/binder_alloc.c
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@ -958,13 +958,14 @@ 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);
@ -977,9 +978,10 @@ 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);