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authorOleg Nesterov <oleg@redhat.com>2013-02-27 17:02:52 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2013-02-27 19:10:09 -0800
commit7ff6764061ecd4a4ef91db7b8b30aacc6a8573c9 (patch)
tree4b98078f0919f60c4ae60190c2cf0b6e495fafaf /kernel/sys.c
parente759a798c639c8bde15c1baa35fb8b451856314b (diff)
downloadlinux-linaro-stable-7ff6764061ecd4a4ef91db7b8b30aacc6a8573c9.tar.gz
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>
Diffstat (limited to 'kernel/sys.c')
-rw-r--r--kernel/sys.c10
1 files changed, 2 insertions, 8 deletions
diff --git a/kernel/sys.c b/kernel/sys.c
index e10566bee399..81f56445fba9 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -2185,11 +2185,6 @@ SYSCALL_DEFINE3(getcpu, unsigned __user *, cpup, unsigned __user *, nodep,
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 @@ static int __orderly_poweroff(void)
}
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;
}