linux-kernel - [PATCH AUTOSEL 5.4 16/22] um: line: always fill *error_out in setup_one

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Message-ID: <20240801003918.3939431-16-sashal@kernel.org>
Date: Wed, 31 Jul 2024 20:38:45 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Johannes Berg <johannes.berg@...el.com>,
	Anton Ivanov <anton.ivanov@...bridgegreys.com>,
	Sasha Levin <sashal@...nel.org>,
	richard@....at,
	johannes@...solutions.net,
	jirislaby@...nel.org,
	gregkh@...uxfoundation.org,
	benjamin@...solutions.net,
	roberto.sassu@...wei.com,
	linux-um@...ts.infradead.org
Subject: [PATCH AUTOSEL 5.4 16/22] um: line: always fill *error_out in setup_one_line()

From: Johannes Berg <johannes.berg@...el.com>

[ Upstream commit 824ac4a5edd3f7494ab1996826c4f47f8ef0f63d ]

The pointer isn't initialized by callers, but I have
encountered cases where it's still printed; initialize
it in all possible cases in setup_one_line().

Link: https://patch.msgid.link/20240703172235.ad863568b55f.Iaa1eba4db8265d7715ba71d5f6bb8c7ff63d27e9@changeid
Acked-By: Anton Ivanov <anton.ivanov@...bridgegreys.com>
Signed-off-by: Johannes Berg <johannes.berg@...el.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 arch/um/drivers/line.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/um/drivers/line.c b/arch/um/drivers/line.c
index d6a78c3548a55..de0ab2e455b03 100644
--- a/arch/um/drivers/line.c
+++ b/arch/um/drivers/line.c
@@ -383,6 +383,7 @@ int setup_one_line(struct line *lines, int n, char *init,
 			parse_chan_pair(NULL, line, n, opts, error_out);
 			err = 0;
 		}
+		*error_out = "configured as 'none'";
 	} else {
 		char *new = kstrdup(init, GFP_KERNEL);
 		if (!new) {
@@ -406,6 +407,7 @@ int setup_one_line(struct line *lines, int n, char *init,
 			}
 		}
 		if (err) {
+			*error_out = "failed to parse channel pair";
 			line->init_str = NULL;
 			line->valid = 0;
 			kfree(new);
-- 
2.43.0