[PATCH 6.8 10/23] binder: fix max_thread type inconsistency

Greg Kroah-Hartman
2024-05-23T13:21:32Z

From: Carlos Llamas <cmllamas@google.com>

commit 42316941335644a98335f209daafa4c122f28983 upstream.

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@android.com>
Cc: stable@vger.kernel.org
Signed-off-by: Carlos Llamas <cmllamas@google.com>
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Link: https://lore.kernel.org/r/20240421173750.3117808-1-cmllamas@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/android/binder.c | 2 +-
drivers/android/binder_internal.h | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/android/binder.c
+++ b/drivers/android/binder.c
@@ -5367,7 +5367,7 @@ static long binder_ioctl(struct file *fi
goto err;
break;
case BINDER_SET_MAX_THREADS: {
- int max_threads;
+ u32 max_threads;

if (copy_from_user(&max_threads, ubuf,
sizeof(max_threads))) {
--- a/drivers/android/binder_internal.h
+++ b/drivers/android/binder_internal.h
@@ -421,7 +421,7 @@ 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;