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From:   Yisheng Xie <xieyisheng1@huawei.com>
To:     <gregkh@linuxfoundation.org>
CC:     <labbott@redhat.com>, <sumit.semwal@linaro.org>,
        <devel@driverdev.osuosl.org>, <linux-kernel@vger.kernel.org>,
        Yisheng Xie <xieyisheng1@huawei.com>
Subject: [PATCH 1/2] staging: android: ion: Avoid NULL point in error path
Date:   Thu, 1 Feb 2018 20:34:06 +0800
Message-ID: <1517488447-41252-1-git-send-email-xieyisheng1@huawei.com>
MIME-Version: 1.0
Content-Type: text/plain
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

If we failed to create debugfs for ion at ion_device_create, the
debug_root of ion_device will be NULL, and then when try to create debug
file for shrinker of heap it will be create on the top of debugfs. If we
also failed to create this the debug file, it call dentry_path to found
the path of debug_root, then a NULL point will occur.

Fix this by avoiding call dentry_path, but show the debug name only when
failed to create debug file for shrinker.

Signed-off-by: Yisheng Xie <xieyisheng1@huawei.com>
---
 drivers/staging/android/ion/ion.c | 10 +++-------
 1 file changed, 3 insertions(+), 7 deletions(-)

diff --git a/drivers/staging/android/ion/ion.c b/drivers/staging/android/ion/ion.c
index f480885..3e41644 100644
--- a/drivers/staging/android/ion/ion.c
+++ b/drivers/staging/android/ion/ion.c
@@ -570,13 +570,9 @@ void ion_device_add_heap(struct ion_heap *heap)
 		debug_file = debugfs_create_file(
 			debug_name, 0644, dev->debug_root, heap,
 			&debug_shrink_fops);
-		if (!debug_file) {
-			char buf[256], *path;
-
-			path = dentry_path(dev->debug_root, buf, 256);
-			pr_err("Failed to create heap shrinker debugfs at %s/%s\n",
-			       path, debug_name);
-		}
+		if (!debug_file)
+			pr_err("Failed to create ion heap shrinker debugfs at %s\n",
+			       debug_name);
 	}
 
 	dev->heap_cnt++;
-- 
1.7.12.4