From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:54753) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gDbXz-0007wM-U7 for qemu-devel@nongnu.org; Fri, 19 Oct 2018 16:39:07 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1gDbXw-0002Xe-Mr for qemu-devel@nongnu.org; Fri, 19 Oct 2018 16:39:03 -0400 From: Liam Merwick Date: Fri, 19 Oct 2018 21:39:04 +0100 Message-Id: <1539981546-10596-7-git-send-email-Liam.Merwick@oracle.com> In-Reply-To: <1539981546-10596-1-git-send-email-Liam.Merwick@oracle.com> References: <1539981546-10596-1-git-send-email-Liam.Merwick@oracle.com> Subject: [Qemu-devel] [PATCH v4 6/8] block: dump_qlist() may dereference a Null pointer List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: qemu-block@nongnu.org, kwolf@redhat.com, jsnow@redhat.com, berrange@redhat.com, mreitz@redhat.com A NULL 'list' passed into function dump_qlist() isn't correctly validated and can be passed to qlist_first() where it is dereferenced. Given that dump_qlist() is static, and callers already do the right thing, just add an assert to catch future potential bugs (plus the added benefit of suppressing a warning from a static analysis tool and removing this noise will help us better find real issues). Signed-off-by: Liam Merwick Reviewed-by: Eric Blake --- block/qapi.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/block/qapi.c b/block/qapi.c index c66f949db839..e81be604217c 100644 --- a/block/qapi.c +++ b/block/qapi.c @@ -740,6 +740,8 @@ static void dump_qlist(fprintf_function func_fprintf, void *f, int indentation, const QListEntry *entry; int i = 0; + assert(list); + for (entry = qlist_first(list); entry; entry = qlist_next(entry), i++) { QType type = qobject_type(entry->value); bool composite = (type == QTYPE_QDICT || type == QTYPE_QLIST); -- 1.8.3.1