From: Johannes Berg <johannes.b...@intel.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.iva...@cambridgegreys.com>
Signed-off-by: Johannes Berg <johannes.b...@intel.com>
Signed-off-by: Sasha Levin <sas...@kernel.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 71e26488dfde2..b5c3bc0e6bce0 100644
--- a/arch/um/drivers/line.c
+++ b/arch/um/drivers/line.c
@@ -391,6 +391,7 @@ 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) {
@@ -414,6 +415,7 @@ 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


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