linux-kernel - [PATCH 02/10] ANDROID: binder: Clear binder and cookie when setting handle in flat binder struct

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Date:   Mon, 24 Oct 2016 15:20:30 +0200
From:   Martijn Coenen <maco@...roid.com>
To:     gregkh@...uxfoundation.org
Cc:     arve@...roid.com, linux-kernel@...r.kernel.org
Subject: [PATCH 02/10] ANDROID: binder: Clear binder and cookie when setting handle in flat binder struct

From: Arve Hjønnevåg <arve@...roid.com>

Prevents leaking pointers between processes

Signed-off-by: Arve Hjønnevåg <arve@...roid.com>
---
 drivers/android/binder.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/android/binder.c b/drivers/android/binder.c
index 3681759..3c71b98 100644
--- a/drivers/android/binder.c
+++ b/drivers/android/binder.c
@@ -1584,7 +1584,9 @@ static void binder_transaction(struct binder_proc *proc,
 				fp->type = BINDER_TYPE_HANDLE;
 			else
 				fp->type = BINDER_TYPE_WEAK_HANDLE;
+			fp->binder = 0;
 			fp->handle = ref->desc;
+			fp->cookie = 0;
 			binder_inc_ref(ref, fp->type == BINDER_TYPE_HANDLE,
 				       &thread->todo);
 
@@ -1634,7 +1636,9 @@ static void binder_transaction(struct binder_proc *proc,
 					return_error = BR_FAILED_REPLY;
 					goto err_binder_get_ref_for_node_failed;
 				}
+				fp->binder = 0;
 				fp->handle = new_ref->desc;
+				fp->cookie = 0;
 				binder_inc_ref(new_ref, fp->type == BINDER_TYPE_HANDLE, NULL);
 				trace_binder_transaction_ref_to_ref(t, ref,
 								    new_ref);
@@ -1688,6 +1692,7 @@ static void binder_transaction(struct binder_proc *proc,
 			binder_debug(BINDER_DEBUG_TRANSACTION,
 				     "        fd %d -> %d\n", fp->handle, target_fd);
 			/* TODO: fput? */
+			fp->binder = 0;
 			fp->handle = target_fd;
 		} break;
 
-- 
2.8.0.rc3.226.g39d4020