linux-kernel - [PATCH 3.12 015/127] ANDROID: binder: Clear binder and cookie when setting handle in flat binder struct

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Message-Id: <a8cfa3bd99581771a0695958382b686da0fe856a.1480062521.git.jslaby@suse.cz>
Date:   Fri, 25 Nov 2016 09:28:48 +0100
From:   Jiri Slaby <jslaby@...e.cz>
To:     stable@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org,
        Arve Hjønnevåg <arve@...roid.com>,
        Martijn Coenen <maco@...roid.com>, Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 015/127] ANDROID: binder: Clear binder and cookie when setting handle in flat binder struct

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

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

commit 4afb604e2d14d429ac9e1fd84b952602853b2df5 upstream.

Prevents leaking pointers between processes

Signed-off-by: Arve Hjønnevåg <arve@...roid.com>
Signed-off-by: Martijn Coenen <maco@...roid.com>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 drivers/staging/android/binder.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/staging/android/binder.c b/drivers/staging/android/binder.c
index 8a436dae9b77..a29a383d160d 100644
--- a/drivers/staging/android/binder.c
+++ b/drivers/staging/android/binder.c
@@ -1541,7 +1541,9 @@ static void binder_transaction(struct binder_proc *proc,
 				fp->type = BINDER_TYPE_HANDLE;
 			else
 				fp->type = BINDER_TYPE_WEAK_HANDLE;
+			fp->binder = NULL;
 			fp->handle = ref->desc;
+			fp->cookie = NULL;
 			binder_inc_ref(ref, fp->type == BINDER_TYPE_HANDLE,
 				       &thread->todo);
 
@@ -1584,7 +1586,9 @@ static void binder_transaction(struct binder_proc *proc,
 					return_error = BR_FAILED_REPLY;
 					goto err_binder_get_ref_for_node_failed;
 				}
+				fp->binder = NULL;
 				fp->handle = new_ref->desc;
+				fp->cookie = NULL;
 				binder_inc_ref(new_ref, fp->type == BINDER_TYPE_HANDLE, NULL);
 				trace_binder_transaction_ref_to_ref(t, ref,
 								    new_ref);
@@ -1631,6 +1635,7 @@ 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 = NULL;
 			fp->handle = target_fd;
 		} break;
 
-- 
2.10.2