linux-kernel - [PATCH] binder: fix printk format for commands

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Date:   Mon,  9 May 2022 23:19:01 +0000
From:   Carlos Llamas <cmllamas@...gle.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Arve Hjønnevåg" <arve@...roid.com>,
        Todd Kjos <tkjos@...roid.com>,
        Martijn Coenen <maco@...roid.com>,
        Christian Brauner <brauner@...nel.org>
Cc:     Joel Fernandes <joel@...lfernandes.org>,
        Hridya Valsaraju <hridya@...gle.com>,
        Suren Baghdasaryan <surenb@...gle.com>,
        kernel-team@...roid.com, linux-kernel@...r.kernel.org,
        Carlos Llamas <cmllamas@...gle.com>
Subject: [PATCH] binder: fix printk format for commands

Make sure we use unsigned format specifier %u for binder commands as
most of them are encoded above INT_MAX. This prevents negative values
when logging them as in the following case:

[  211.895781] binder: 8668:8668 BR_REPLY 258949 0:0, cmd -2143260157 size 0-0 ptr 0000006e766a8000-0000006e766a8000

Signed-off-by: Carlos Llamas <cmllamas@...gle.com>
---
 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 f3b639e89dd8..b4b0e4489bef 100644
--- a/drivers/android/binder.c
+++ b/drivers/android/binder.c
@@ -3984,7 +3984,7 @@ static int binder_thread_write(struct binder_proc *proc,
 		} break;
 
 		default:
-			pr_err("%d:%d unknown command %d\n",
+			pr_err("%d:%d unknown command %u\n",
 			       proc->pid, thread->pid, cmd);
 			return -EINVAL;
 		}
@@ -4490,7 +4490,7 @@ static int binder_thread_read(struct binder_proc *proc,
 		trace_binder_transaction_received(t);
 		binder_stat_br(proc, thread, cmd);
 		binder_debug(BINDER_DEBUG_TRANSACTION,
-			     "%d:%d %s %d %d:%d, cmd %d size %zd-%zd ptr %016llx-%016llx\n",
+			     "%d:%d %s %d %d:%d, cmd %u size %zd-%zd ptr %016llx-%016llx\n",
 			     proc->pid, thread->pid,
 			     (cmd == BR_TRANSACTION) ? "BR_TRANSACTION" :
 				(cmd == BR_TRANSACTION_SEC_CTX) ?
-- 
2.36.0.512.ge40c2bad7a-goog