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fail_function: Remove a redundant mutex unlock

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[ Upstream commit 2801a5da5b ]

Fix a mutex_unlock() issue where before copy_from_user() is
not called mutex_locked.

Fixes: 4b1a29a7f5 ("error-injection: Support fault injection framework")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Luo Meng <luomeng12@huawei.com>
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Link: https://lore.kernel.org/bpf/160570737118.263807.8358435412898356284.stgit@devnote2
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Luo Meng 2020-11-18 22:49:31 +09:00 committed by Greg Kroah-Hartman
parent b9589cb079
commit 989d275ac5
1 changed files with 3 additions and 2 deletions
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5
kernel/fail_function.c
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@ -253,7 +253,7 @@ static ssize_t fei_write(struct file *file, const char __user *buffer,
if (copy_from_user(buf, buffer, count)) {
ret = -EFAULT;
goto out;
goto out_free;
}
buf[count] = '\0';
sym = strstrip(buf);
@ -307,8 +307,9 @@ static ssize_t fei_write(struct file *file, const char __user *buffer,
ret = count;
}
out:
kfree(buf);
mutex_unlock(&fei_lock);
out_free:
kfree(buf);
return ret;
}