From 3c286b3cb1b234b88335029c968320b7ff8bc493 Mon Sep 17 00:00:00 2001 From: Frank Morgner Date: Sat, 26 Oct 2019 23:50:11 +0200 Subject: [PATCH] fixed Null-dereference READ https://oss-fuzz.com/testcase-detail/5734505646391296 Thanks to OSS-Fuzz --- src/libopensc/asn1.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/src/libopensc/asn1.c b/src/libopensc/asn1.c index c68f62c9..74d6135a 100644 --- a/src/libopensc/asn1.c +++ b/src/libopensc/asn1.c @@ -68,7 +68,7 @@ int sc_asn1_read_tag(const u8 ** buf, size_t buflen, unsigned int *cla_out, *buf = NULL; - if (left == 0) + if (left == 0 || !p) return SC_ERROR_INVALID_ASN1_OBJECT; if (*p == 0xff || *p == 0) { /* end of data reached */