From 49432a001824f973ccf8214c7ef9e8e72c974987 Mon Sep 17 00:00:00 2001 From: Oleg Nesterov Date: Thu, 16 May 2013 17:43:55 +0200 Subject: usermodehelper: check subprocess_info->path != NULL commit 264b83c07a84223f0efd0d1db9ccc66d6f88288f upstream. argv_split(empty_or_all_spaces) happily succeeds, it simply returns argc == 0 and argv[0] == NULL. Change call_usermodehelper_exec() to check sub_info->path != NULL to avoid the crash. This is the minimal fix, todo: - perhaps we should change argv_split() to return NULL or change the callers. - kill or justify ->path[0] check - narrow the scope of helper_lock() Signed-off-by: Oleg Nesterov Acked-By: Lucas De Marchi Signed-off-by: Linus Torvalds Signed-off-by: Greg Kroah-Hartman --- kernel/kmod.c | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'kernel') diff --git a/kernel/kmod.c b/kernel/kmod.c index fabfe54..f625b4f 100644 --- a/kernel/kmod.c +++ b/kernel/kmod.c @@ -421,6 +421,11 @@ int call_usermodehelper_exec(struct subprocess_info *sub_info, int retval = 0; helper_lock(); + if (!sub_info->path) { + retval = -EINVAL; + goto out; + } + if (sub_info->path[0] == '\0') goto out; -- cgit v1.1