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From: Todd Kjos <tkjos@android.com>
To: tkjos@google.com, gregkh@linuxfoundation.org, arve@android.com,
	devel@driverdev.osuosl.org, linux-kernel@vger.kernel.org,
	maco@google.com
Cc: joel@joelfernandes.org, kernel-team@android.com,
	syzbot+55de1eb4975dec156d8f@syzkaller.appspotmail.com
Subject: [PATCH] binder: fix handling of misaligned binder object
Date: Thu, 14 Feb 2019 15:22:57 -0800	[thread overview]
Message-ID: <20190214232257.76856-1-tkjos@google.com> (raw)

Fixes crash found by syzbot:
kernel BUG at drivers/android/binder_alloc.c:LINE! (2)

Reported-by: syzbot+55de1eb4975dec156d8f@syzkaller.appspotmail.com
Signed-off-by: Todd Kjos <tkjos@google.com>
---
Applies to linux-next

 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 2dba539eb792c..8685882da64cd 100644
--- a/drivers/android/binder.c
+++ b/drivers/android/binder.c
@@ -2057,7 +2057,7 @@ static size_t binder_get_object(struct binder_proc *proc,
 	size_t object_size = 0;
 
 	read_size = min_t(size_t, sizeof(*object), buffer->data_size - offset);
-	if (read_size < sizeof(*hdr))
+	if (read_size < sizeof(*hdr) || !IS_ALIGNED(offset, sizeof(u32)))
 		return 0;
 	binder_alloc_copy_from_buffer(&proc->alloc, object, buffer,
 				      offset, read_size);
-- 
2.21.0.rc0.258.g878e2cd30e-goog


             reply	other threads:[~2019-02-14 23:23 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-02-14 23:22 Todd Kjos [this message]
2019-02-15  7:48 ` [PATCH] binder: fix handling of misaligned binder object Greg KH

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