Commit 730b192a authored Nov 18, 2020 by Luo Meng Committed by Greg Kroah-Hartman Nov 24, 2020

fail_function: Remove a redundant mutex unlock



[ Upstream commit 2801a5da5b25b7af9dd2addd19b2315c02d17b64 ]

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

Fixes: 4b1a29a7 ("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>

parent edca4831

kernel/fail_function.c

+3 −2

Original line number	Diff line number	Diff line
		@@ -261,7 +261,7 @@ 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);
		@@ -315,8 +315,9 @@ 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;
		}