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authorArve Hjønnevåg <arve@android.com>2009-04-06 15:12:55 -0700
committerGreg Kroah-Hartman <gregkh@suse.de>2009-04-17 11:06:26 -0700
commit4ddfc911e39a01f95ad9765d3b9e6f43e14eeff4 (patch)
tree2188fdf4f928a78dfcc6fb3305041494ef59da10 /drivers/staging
parent85e0b0cbbfc17e7f7baa9e76f9a937249108fc52 (diff)
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>
Diffstat (limited to 'drivers/staging')
-rw-r--r--drivers/staging/android/binder.c10
1 files changed, 9 insertions, 1 deletions
diff --git a/drivers/staging/android/binder.c b/drivers/staging/android/binder.c
index 39871da7ef9..761f5d6a9cf 100644
--- a/drivers/staging/android/binder.c
+++ b/drivers/staging/android/binder.c
@@ -2694,6 +2694,12 @@ static int binder_mmap(struct file *filp, struct vm_area_struct *vma)
}
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 @@ static int binder_mmap(struct file *filp, struct vm_area_struct *vma)
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;