Staging: binder: mmap fixes.
Only allow a binder file pointer to be mmapped once. The buffer management
code cannot deal with more then one area.
Also remove leftover mutex_unlock if mmap fails.
Signed-off-by: Arve Hjønnevåg <arve@android.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/staging/android/binder.c b/drivers/staging/android/binder.c
index 39871da..761f5d6 100644
--- a/drivers/staging/android/binder.c
+++ b/drivers/staging/android/binder.c
@@ -2694,6 +2694,12 @@
}
vma->vm_flags = (vma->vm_flags | VM_DONTCOPY) & ~VM_MAYWRITE;
+ if (proc->buffer) {
+ ret = -EBUSY;
+ failure_string = "already mapped";
+ goto err_already_mapped;
+ }
+
area = get_vm_area(vma->vm_end - vma->vm_start, VM_IOREMAP);
if (area == NULL) {
ret = -ENOMEM;
@@ -2741,10 +2747,12 @@
err_alloc_small_buf_failed:
kfree(proc->pages);
+ proc->pages = NULL;
err_alloc_pages_failed:
vfree(proc->buffer);
+ proc->buffer = NULL;
err_get_vm_area_failed:
- mutex_unlock(&binder_lock);
+err_already_mapped:
err_bad_arg:
printk(KERN_ERR "binder_mmap: %d %lx-%lx %s failed %d\n", proc->pid, vma->vm_start, vma->vm_end, failure_string, ret);
return ret;