linux-kernel - [PATCH v2] binder: Add invalid handle info in user error log

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Message-Id: <20210802220446.1938347-1-ramjiyani@google.com>
Date:   Mon,  2 Aug 2021 22:04:45 +0000
From:   Ramji Jiyani <ramjiyani@...gle.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Arve Hjønnevåg" <arve@...roid.com>,
        Todd Kjos <tkjos@...roid.com>,
        Martijn Coenen <maco@...roid.com>,
        Joel Fernandes <joel@...lfernandes.org>,
        Christian Brauner <christian@...uner.io>,
        Hridya Valsaraju <hridya@...gle.com>,
        Suren Baghdasaryan <surenb@...gle.com>
Cc:     Ramji Jiyani <ramjiyani@...gle.com>, Todd Kjos <tkjos@...gle.com>,
        kernel-team@...roid.com, linux-kernel@...r.kernel.org
Subject: [PATCH v2] binder: Add invalid handle info in user error log

In the case of a failed transaction, only the thread and process id are
logged. Add the handle info for the reference to the target node in user
error log to aid debugging.

Signed-off-by: Ramji Jiyani <ramjiyani@...gle.com>
Acked-by: Todd Kjos <tkjos@...gle.com>
---
v1 -> v2: Rephrased the commit message as per review comment
---
 drivers/android/binder.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/android/binder.c b/drivers/android/binder.c
index bcec598b89f2..d9030cb6b1e4 100644
--- a/drivers/android/binder.c
+++ b/drivers/android/binder.c
@@ -2547,8 +2547,8 @@ static void binder_transaction(struct binder_proc *proc,
 						ref->node, &target_proc,
 						&return_error);
 			} else {
-				binder_user_error("%d:%d got transaction to invalid handle\n",
-						  proc->pid, thread->pid);
+				binder_user_error("%d:%d got transaction to invalid handle, %u\n",
+						  proc->pid, thread->pid, tr->target.handle);
 				return_error = BR_FAILED_REPLY;
 			}
 			binder_proc_unlock(proc);
-- 
2.32.0.554.ge1b32706d8-goog