usermodehelper: cleanup/fix __orderly_poweroff() && argv_free()
authorOleg Nesterov <oleg@redhat.com>
Thu, 28 Feb 2013 01:02:52 +0000 (17:02 -0800)
committerLinus Torvalds <torvalds@linux-foundation.org>
Thu, 28 Feb 2013 03:10:09 +0000 (19:10 -0800)
commit7ff6764061ecd4a4ef91db7b8b30aacc6a8573c9
tree4b98078f0919f60c4ae60190c2cf0b6e495fafaf
parente759a798c639c8bde15c1baa35fb8b451856314b
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>
kernel/sys.c