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pkcs7: Prevent NULL pointer dereference, since sinfo is not always set.

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

Fixes: 99db443506 ("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>
cc: stable@vger.kernel.org # 4.3+
This commit is contained in:
Eric Sesterhenn 2017-10-08 20:02:32 +02:00 committed by David Howells
parent ab5c69f013
commit 68a1fdbbf8
1 changed files with 3 additions and 0 deletions
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3
crypto/asymmetric_keys/pkcs7_parser.c
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@ -88,6 +88,9 @@ static int pkcs7_check_authattrs(struct pkcs7_message *msg)
bool want = false;
sinfo = msg->signed_infos;
if (!sinfo)
goto inconsistent;
if (sinfo->authattrs) {
want = true;
msg->have_authattrs = true;