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https://github.com/Divested-Mobile/DivestOS-Build.git
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56 lines
2.1 KiB
Diff
56 lines
2.1 KiB
Diff
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From 4b788ca419ec37e4cdb421fef9edc208a491ce30 Mon Sep 17 00:00:00 2001
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From: Mohit Aggarwal <maggarwa@codeaurora.org>
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Date: Thu, 25 May 2017 20:21:12 +0530
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Subject: [PATCH] diag: Synchronize command registration table access
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Currently, command registration table is being read
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in debugfs without any protection which may lead to
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access of stale entries. The patch takes care of the
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issue by adding proper protection.
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CRs-Fixed: 2032672
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Bug: 63868628
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Change-Id: I6ae058c16873f9ed52ae6516a1a70fd6d2d0da80
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Signed-off-by: Mohit Aggarwal <maggarwa@codeaurora.org>
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---
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drivers/char/diag/diag_debugfs.c | 6 +++++-
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1 file changed, 5 insertions(+), 1 deletion(-)
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diff --git a/drivers/char/diag/diag_debugfs.c b/drivers/char/diag/diag_debugfs.c
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index f5e4eba1e96bc..b66c8cb8257c2 100644
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--- a/drivers/char/diag/diag_debugfs.c
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+++ b/drivers/char/diag/diag_debugfs.c
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@@ -1,4 +1,4 @@
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-/* Copyright (c) 2011-2016, The Linux Foundation. All rights reserved.
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+/* Copyright (c) 2011-2017, The Linux Foundation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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@@ -268,8 +268,10 @@ static ssize_t diag_dbgfs_read_table(struct file *file, char __user *ubuf,
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struct list_head *temp;
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struct diag_cmd_reg_t *item = NULL;
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+ mutex_lock(&driver->cmd_reg_mutex);
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if (diag_dbgfs_table_index == driver->cmd_reg_count) {
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diag_dbgfs_table_index = 0;
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+ mutex_unlock(&driver->cmd_reg_mutex);
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return 0;
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}
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@@ -278,6 +280,7 @@ static ssize_t diag_dbgfs_read_table(struct file *file, char __user *ubuf,
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buf = kzalloc(sizeof(char) * buf_size, GFP_KERNEL);
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if (ZERO_OR_NULL_PTR(buf)) {
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pr_err("diag: %s, Error allocating memory\n", __func__);
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+ mutex_unlock(&driver->cmd_reg_mutex);
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return -ENOMEM;
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}
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buf_size = ksize(buf);
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@@ -322,6 +325,7 @@ static ssize_t diag_dbgfs_read_table(struct file *file, char __user *ubuf,
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break;
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}
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diag_dbgfs_table_index = i;
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+ mutex_unlock(&driver->cmd_reg_mutex);
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*ppos = 0;
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ret = simple_read_from_buffer(ubuf, count, ppos, buf, bytes_in_buffer);
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