[PATCH] ANDROID: binder: fix transaction leak.

[PATCH] ANDROID: binder: fix transaction leak.

[Martijn Coenen]

If a call to put_user() fails, we failed to
properly free a transaction and send a failed
reply (if necessary).

Signed-off-by: Martijn Coenen <maco@android.com>
---
 drivers/android/binder.c | 40 +++++++++++++++++++++++++++++++---------
 1 file changed, 31 insertions(+), 9 deletions(-)

diff --git a/drivers/android/binder.c b/drivers/android/binder.c
index 95a96a254e5d..e947b09607ed 100644
--- a/drivers/android/binder.c
+++ b/drivers/android/binder.c
@@ -1947,6 +1947,26 @@ static void binder_send_failed_reply(struct binder_transaction *t,
 	}
 }
 
+/**
+ * binder_cleanup_transaction() - cleans up undelivered transaction
+ * @t:		transaction that needs to be cleaned up
+ * @reason:	reason the transaction wasn't delivered
+ * @error_code:	error to return to caller (if synchronous call)
+ */
+static void binder_cleanup_transaction(struct binder_transaction *t,
+				       const char *reason,
+				       uint32_t error_code)
+{
+	if (t->buffer->target_node && !(t->flags & TF_ONE_WAY)) {
+		binder_send_failed_reply(t, error_code);
+	} else {
+		binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
+			"undelivered transaction %d, %s\n",
+			t->debug_id, reason);
+		binder_free_transaction(t);
+	}
+}
+
 /**
  * binder_validate_object() - checks for a valid metadata object in a buffer.
  * @buffer:	binder_buffer that we're parsing.
@@ -4015,12 +4035,20 @@ static int binder_thread_read(struct binder_proc *proc,
 		if (put_user(cmd, (uint32_t __user *)ptr)) {
 			if (t_from)
 				binder_thread_dec_tmpref(t_from);
+
+			binder_cleanup_transaction(t, "put_user failed",
+						   BR_FAILED_REPLY);
+
 			return -EFAULT;
 		}
 		ptr += sizeof(uint32_t);
 		if (copy_to_user(ptr, &tr, sizeof(tr))) {
 			if (t_from)
 				binder_thread_dec_tmpref(t_from);
+
+			binder_cleanup_transaction(t, "copy_to_user failed",
+						   BR_FAILED_REPLY);
+
 			return -EFAULT;
 		}
 		ptr += sizeof(tr);
@@ -4090,15 +4118,9 @@ static void binder_release_work(struct binder_proc *proc,
 			struct binder_transaction *t;
 
 			t = container_of(w, struct binder_transaction, work);
-			if (t->buffer->target_node &&
-			    !(t->flags & TF_ONE_WAY)) {
-				binder_send_failed_reply(t, BR_DEAD_REPLY);
-			} else {
-				binder_debug(BINDER_DEBUG_DEAD_TRANSACTION,
-					"undelivered transaction %d\n",
-					t->debug_id);
-				binder_free_transaction(t);
-			}
+
+			binder_cleanup_transaction(t, "process died.",
+						   BR_DEAD_REPLY);
 		} break;
 		case BINDER_WORK_RETURN_ERROR: {
 			struct binder_error *e = container_of(
-- 
2.15.0.448.gf294e3d99a-goog

Re: [PATCH] ANDROID: binder: fix transaction leak.

[Greg KH]

On Mon, Nov 13, 2017 at 10:06:08AM +0100, Martijn Coenen wrote:
> If a call to put_user() fails, we failed to
> properly free a transaction and send a failed
> reply (if necessary).
> 
> Signed-off-by: Martijn Coenen <maco@android.com>
> ---
>  drivers/android/binder.c | 40 +++++++++++++++++++++++++++++++---------
>  1 file changed, 31 insertions(+), 9 deletions(-)

Is this relevant for 4.14 and any older kernels as well?

thanks,

greg k-h

Re: [PATCH] ANDROID: binder: fix transaction leak.

[Martijn Coenen]

On Mon, Nov 13, 2017 at 10:49 AM, Greg KH <gregkh@linuxfoundation.org> wrote:
> Is this relevant for 4.14 and any older kernels as well?

The problem was introduced with fine-grained locking, which is 4.14 and up only.

Thanks,
Martijn