linux-kernel - [PATCH 2/2] android: binder: Fix null ptr dereference in debug msg

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Message-Id: <20171006201206.27073-3-sherryy@android.com>
Date:   Fri,  6 Oct 2017 16:12:06 -0400
From:   Sherry Yang <sherryy@...roid.com>
To:     linux-kernel@...r.kernel.org
Cc:     tkjos@...gle.com, maco@...gle.com,
        Sherry Yang <sherryy@...roid.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Arve Hjønnevåg <arve@...roid.com>,
        Riley Andrews <riandrews@...roid.com>,
        devel@...verdev.osuosl.org (open list:ANDROID DRIVERS)
Subject: [PATCH 2/2] android: binder: Fix null ptr dereference in debug msg

Don't access next->data in kernel debug message when the
next buffer is null.

Acked-by: Arve Hjønnevåg <arve@...roid.com>
Signed-off-by: Sherry Yang <sherryy@...roid.com>
---
 drivers/android/binder_alloc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/android/binder_alloc.c b/drivers/android/binder_alloc.c
index 47e2c032ad3d..6f6f745605af 100644
--- a/drivers/android/binder_alloc.c
+++ b/drivers/android/binder_alloc.c
@@ -560,7 +560,7 @@ static void binder_delete_free_buffer(struct binder_alloc *alloc,
 		binder_alloc_debug(BINDER_DEBUG_BUFFER_ALLOC,
 				   "%d: merge free, buffer %pK do not share page with %pK or %pK\n",
 				   alloc->pid, buffer->data,
-				   prev->data, next->data);
+				   prev->data, next ? next->data : NULL);
 		binder_update_page_range(alloc, 0, buffer_start_page(buffer),
 					 buffer_start_page(buffer) + PAGE_SIZE);
 	}
-- 
2.11.0 (Apple Git-81)