linux-kernel - [PATCH 4/4] binder: fix max

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Message-ID: <20240417191418.1341988-5-cmllamas@google.com>
Date: Wed, 17 Apr 2024 19:13:44 +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>, 
	Joel Fernandes <joel@...lfernandes.org>, Christian Brauner <brauner@...nel.org>, 
	Carlos Llamas <cmllamas@...gle.com>, Suren Baghdasaryan <surenb@...gle.com>, 
	Serban Constantinescu <serban.constantinescu@....com>
Cc: linux-kernel@...r.kernel.org, kernel-team@...roid.com, 
	Alice Ryhl <aliceryhl@...gle.com>, stable@...r.kernel.org
Subject: [PATCH 4/4] binder: fix max_thread type inconsistency

The type defined for the BINDER_SET_MAX_THREADS ioctl was changed from
size_t to __u32 in order to avoid incompatibility issues between 32 and
64-bit kernels. However, the internal types used to copy from user and
store the value were never updated. Use u32 to fix the inconsistency.

Fixes: a9350fc859ae ("staging: android: binder: fix BINDER_SET_MAX_THREADS declaration")
Reported-by: Arve Hjønnevåg <arve@...roid.com>
Cc: stable@...r.kernel.org
Signed-off-by: Carlos Llamas <cmllamas@...gle.com>
---
 drivers/android/binder.c          | 2 +-
 drivers/android/binder_internal.h | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/android/binder.c b/drivers/android/binder.c
index f120a24c9ae6..2596cbfa16d0 100644
--- a/drivers/android/binder.c
+++ b/drivers/android/binder.c
@@ -5408,7 +5408,7 @@ static long binder_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 			goto err;
 		break;
 	case BINDER_SET_MAX_THREADS: {
-		int max_threads;
+		u32 max_threads;
 
 		if (copy_from_user(&max_threads, ubuf,
 				   sizeof(max_threads))) {
diff --git a/drivers/android/binder_internal.h b/drivers/android/binder_internal.h
index 221ab7a6384a..3c522698083f 100644
--- a/drivers/android/binder_internal.h
+++ b/drivers/android/binder_internal.h
@@ -426,7 +426,7 @@ struct binder_proc {
 	struct list_head todo;
 	struct binder_stats stats;
 	struct list_head delivered_death;
-	int max_threads;
+	u32 max_threads;
 	int requested_threads;
 	int requested_threads_started;
 	int tmp_ref;
-- 
2.44.0.683.g7961c838ac-goog