From f2b2ee441adb22bdcab7247589545eb27c941d78 Mon Sep 17 00:00:00 2001 From: =?utf8?q?Petr=20=C5=A0tetiar?= Date: Tue, 10 Dec 2019 12:02:40 +0100 Subject: [PATCH] blobmsg: fix heap buffer overflow in blobmsg_parse MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit Fixes following error found by the fuzzer: ==29774==ERROR: AddressSanitizer: heap-buffer-overflow READ of size 1 at 0x6020004f1c56 thread T0 #0 strcmp sanitizer_common_interceptors.inc:442:3 #1 blobmsg_parse blobmsg.c:168:8 Signed-off-by: Petr Å tetiar --- blobmsg.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/blobmsg.c b/blobmsg.c index 1a8b783..71d4a36 100644 --- a/blobmsg.c +++ b/blobmsg.c @@ -53,6 +53,9 @@ bool blobmsg_check_attr(const struct blob_attr *attr, bool name) id = blob_id(attr); len = blobmsg_data_len(attr); + if (len > blob_raw_len(attr)) + return false; + data = blobmsg_data(attr); if (id > BLOBMSG_TYPE_LAST) -- 2.25.1