linux-kernel - [RESEND PATCH] drivers: android: correct the size of struct binder_uintptr_t for BC_DEAD_BINDER

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Date:	Wed, 17 Feb 2016 09:32:52 +0800
From:	Nicolas Boichat <drinkcat@...omium.org>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	Arve Hjønnevåg <arve@...roid.com>,
	Riley Andrews <riandrews@...roid.com>,
	devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
	olofj@...omium.org, Lisa Du <cldu@...vell.com>
Subject: [RESEND PATCH] drivers: android: correct the size of struct binder_uintptr_t for BC_DEAD_BINDER_DONE

From: Lisa Du <cldu@...vell.com>

There's one point was missed in the patch commit da49889deb34 ("staging:
binder: Support concurrent 32 bit and 64 bit processes."). When configure
BINDER_IPC_32BIT, the size of binder_uintptr_t was 32bits, but size of
void * is 64bit on 64bit system. Correct it here.

Signed-off-by: Lisa Du <cldu@...vell.com>
Signed-off-by: Nicolas Boichat <drinkcat@...omium.org>
---

This patch was first sent upstream here: https://lkml.org/lkml/2015/5/28/747,
but was not picked up (probably because it was part of a bigger series that
refactored binder).

This patch fixes issues when using 64-bit binder API on 32-bit kernels.

 drivers/android/binder.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/android/binder.c b/drivers/android/binder.c
index 796301a..16288e7 100644
--- a/drivers/android/binder.c
+++ b/drivers/android/binder.c
@@ -2081,7 +2081,7 @@ static int binder_thread_write(struct binder_proc *proc,
 			if (get_user(cookie, (binder_uintptr_t __user *)ptr))
 				return -EFAULT;
 
-			ptr += sizeof(void *);
+			ptr += sizeof(cookie);
 			list_for_each_entry(w, &proc->delivered_death, entry) {
 				struct binder_ref_death *tmp_death = container_of(w, struct binder_ref_death, work);
 
-- 
2.7.0.rc3.207.g0ac5344