[PATCH v2] module: fix lost error code from codetag_load_module()

[Hao Ge <hao.ge@linux.dev>]

If codetag_load_module() fails, err is not set to reflect the failure
and load_module() returns 0 after the module has been torn down.

Also, if the module is a livepatch, mod->klp_info allocated by
copy_module_elf() leaks on this error path. Free it via a new
livepatch_cleanup label.

Fixes: 044d2aee6c57 ("alloc_tag: handle module codetag load errors as module load failures")
Reported-by: Sashiko <sashiko-bot@kernel.org>
Suggested-by: Petr Pavlu <petr.pavlu@suse.com>
Reviewed-by: Bradley Morgan <brads@mainlining.org>
Cc: stable@vger.kernel.org
Signed-off-by: Hao Ge <hao.ge@linux.dev>
---
v2: also free mod->klp_info of livepatch modules on this
    error path (Petr Pavlu).

v1 link: https://lore.kernel.org/all/20260824014736.35026-1-hao.ge@linux.dev/
---
 kernel/module/main.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/kernel/module/main.c b/kernel/module/main.c
index 46dd8d25a605..c32f1d370b73 100644
--- a/kernel/module/main.c
+++ b/kernel/module/main.c
@@ -3568,8 +3568,9 @@ static int load_module(struct load_info *info, const char __user *uargs,
 			goto sysfs_cleanup;
 	}
 
-	if (codetag_load_module(mod))
-		goto sysfs_cleanup;
+	err = codetag_load_module(mod);
+	if (err)
+		goto livepatch_cleanup;
 
 	/* Get rid of temporary copy. */
 	free_copy(info, flags);
@@ -3579,6 +3580,9 @@ static int load_module(struct load_info *info, const char __user *uargs,
 
 	return do_init_module(mod);
 
+ livepatch_cleanup:
+	if (is_livepatch_module(mod))
+		free_module_elf(mod);
  sysfs_cleanup:
 	mod_sysfs_teardown(mod);
  coming_cleanup:
-- 
2.25.1