[PATCH v4 11/11] liveupdate: fix return value on session allocation failure

[Pasha Tatashin]

When session allocation fails during deserialization, the global 'err'
variable was not updated before returning. This caused subsequent calls
to luo_session_deserialize() to incorrectly report success.

Ensure 'err' is set to the error code from PTR_ERR(session). This
ensures that an error is correctly returned to userspace when it
attempts to open /dev/liveupdate in the new kernel if deserialization
failed.

Signed-off-by: Pasha Tatashin <pasha.tatashin@xxxxxxxxxx>
---
 kernel/liveupdate/luo_session.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/kernel/liveupdate/luo_session.c b/kernel/liveupdate/luo_session.c
index a3327a28fc1f..92b1af791889 100644
--- a/kernel/liveupdate/luo_session.c
+++ b/kernel/liveupdate/luo_session.c
@@ -547,7 +547,8 @@ int luo_session_deserialize(void)
 			pr_warn("Failed to allocate session [%.*s] during deserialization %pe\n",
 				(int)sizeof(sh->ser[i].name),
 				sh->ser[i].name, session);
-			return PTR_ERR(session);
+			err = PTR_ERR(session);
+			return err;
 		}
 
 		err = luo_session_insert(sh, session);
-- 
2.43.0