evie/android_kernel_oneplus_msm8998
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Perf: arm64: avoid use of uninitialized variable

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Variable "buf" is not initialized. It may contain the data from
stack when "count == 0". Kernel information leak is possible due
to different code path execution.

Change-Id: I041b2e7262f7f66a9b039c0f0591bbb1fc9e4890
Signed-off-by: Patrick Fay <pfay@codeaurora.org>
This commit is contained in:
Patrick Fay 2017-06-19 20:20:40 -07:00 • committed by Gerrit - the friendly Code Review server
parent 35589846a0
commit 8fc0a6808a
1 changed files with 2 additions and 1 deletions
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3
arch/arm64/kernel/perf_trace_counters.c
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@ -1,4 +1,4 @@
/* Copyright (c) 2013-2014, The Linux Foundation. All rights reserved.
/* Copyright (c) 2013-2014, 2017 The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
@ -124,6 +124,7 @@ static ssize_t write_enabled_perftp_file_bool(struct file *file,
char buf[32];
size_t buf_size;
buf[0] = 0;
buf_size = min(count, (sizeof(buf)-1));
if (copy_from_user(buf, user_buf, buf_size))
return -EFAULT;