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Subject[PATCH 4.13 65/85] pkcs7: Prevent NULL pointer dereference, since sinfo is not always set.
Date
4.13-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Eric Sesterhenn <eric.sesterhenn@x41-dsec.de>

commit 68a1fdbbf8bd3378325e45c19e167a165f9ffc3a upstream.

The ASN.1 parser does not necessarily set the sinfo field,
this patch prevents a NULL pointer dereference on broken
input.

Fixes: 99db44350672 ("PKCS#7: Appropriately restrict authenticated attributes and content type")
Signed-off-by: Eric Sesterhenn <eric.sesterhenn@x41-dsec.de>
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
crypto/asymmetric_keys/pkcs7_parser.c | 3 +++
1 file changed, 3 insertions(+)

--- a/crypto/asymmetric_keys/pkcs7_parser.c
+++ b/crypto/asymmetric_keys/pkcs7_parser.c
@@ -88,6 +88,9 @@ static int pkcs7_check_authattrs(struct
bool want = false;

sinfo = msg->signed_infos;
+ if (!sinfo)
+ goto inconsistent;
+
if (sinfo->authattrs) {
want = true;
msg->have_authattrs = true;

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