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liveupdate: reject nonzero reserved value for SESSION_FINISH

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The UAPI documents liveupdate_session_finish::reserved as requiring zero,
but luo_session_finish() currently ignores it and finishes the session.
Accepting nonzero values prevents the field from being safely repurposed
by a future extension.

Reject nonzero reserved values before changing session state, matching
LIVEUPDATE_SESSION_GET_NAME.

Fixes: 16cec0d265 ("liveupdate: luo_session: add ioctls for file preservation")
Assisted-by: Codex:gpt-5.6-sol
Reviewed-by: Pratyush Yadav (Google) <pratyush@kernel.org>
Signed-off-by: Jackie Liu <liuyun01@kylinos.cn>
Link: https://patch.msgid.link/20260716012607.22020-2-liu.yun@linux.dev
Signed-off-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
This commit is contained in:
Jackie Liu
2026-07-16 09:26:07 +08:00
committed by Mike Rapoport (Microsoft)
parent 797fe91e50
commit 05cf3d87a0
1 changed files with 5 additions and 1 deletions
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6
kernel/liveupdate/luo_session.c
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@@ -316,8 +316,12 @@ static int luo_session_finish(struct luo_session *session,
struct luo_ucmd *ucmd)
{
struct liveupdate_session_finish *argp = ucmd->cmd;
int err = luo_session_finish_one(session);
int err;
if (argp->reserved)
return -EINVAL;
err = luo_session_finish_one(session);
if (err)
return err;