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[AT] Add null pointer check in at_client_get (#7154)

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1. prevent null-pointer dereference in rt_strcmp
This commit is contained in:
Lu_Reaper
2023-04-03 23:04:40 +08:00
committed by GitHub
parent dd17ca01e6
commit 3a9c5690b1
1 changed files with 3 additions and 2 deletions
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5
components/net/at/src/at_client.c
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@@ -1,5 +1,5 @@
/*
* Copyright (c) 2006-2021, RT-Thread Development Team
* Copyright (c) 2006-2023, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
@@ -610,7 +610,8 @@ at_client_t at_client_get(const char *dev_name)
for (idx = 0; idx < AT_CLIENT_NUM_MAX; idx++)
{
if (rt_strcmp(at_client_table[idx].device->parent.name, dev_name) == 0)
if (at_client_table[idx].device &&
(rt_strcmp(at_client_table[idx].device->parent.name, dev_name) == 0))
{
return &at_client_table[idx];
}