From: Johannes Berg johannes.berg@intel.com

stable inclusion from stable-v5.10.226 commit c8944d449fda9f58c03bd99649b2df09948fc874 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IAU9NH CVE: CVE-2024-46844

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...

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[ 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.Iaa1eba4db8265d7715ba71... Acked-By: Anton Ivanov anton.ivanov@cambridgegreys.com Signed-off-by: Johannes Berg johannes.berg@intel.com Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Tong Tiangen tongtiangen@huawei.com --- 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 37e96ba0f5fb..d2beb4a497a2 100644 --- a/arch/um/drivers/line.c +++ b/arch/um/drivers/line.c @@ -378,6 +378,7 @@ 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) { @@ -401,6 +402,7 @@ 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);