usermodehelper: cleanup/fix __orderly_poweroff() && argv_free()
__orderly_poweroff() does argv_free() if call_usermodehelper_fns()
returns -ENOMEM. As Lucas pointed out, this can be wrong if -ENOMEM was
not triggered by the failing call_usermodehelper_setup(), in this case
both __orderly_poweroff() and argv_cleanup() can do kfree().
Kill argv_cleanup() and change __orderly_poweroff() to call argv_free()
unconditionally like do_coredump() does. This info->cleanup() is not
needed (and wrong) since 6c0c0d4d "fix bug in orderly_poweroff() which
did the UMH_NO_WAIT => UMH_WAIT_EXEC change, we can rely on the fact
that CLONE_VFORK can't return until do_execve() succeeds/fails.
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Reported-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
Cc: David Howells <dhowells@redhat.com>
Cc: James Morris <james.l.morris@oracle.com>
Cc: hongfeng <hongfeng@marvell.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/kernel/sys.c b/kernel/sys.c
index e10566b..81f5644 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -2185,11 +2185,6 @@
char poweroff_cmd[POWEROFF_CMD_PATH_LEN] = "/sbin/poweroff";
-static void argv_cleanup(struct subprocess_info *info)
-{
- argv_free(info->argv);
-}
-
static int __orderly_poweroff(void)
{
int argc;
@@ -2209,9 +2204,8 @@
}
ret = call_usermodehelper_fns(argv[0], argv, envp, UMH_WAIT_EXEC,
- NULL, argv_cleanup, NULL);
- if (ret == -ENOMEM)
- argv_free(argv);
+ NULL, NULL, NULL);
+ argv_free(argv);
return ret;
}