lkml.org 
[lkml]   [2017]   [Oct]   [24]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 4.4 24/27] pkcs7: Prevent NULL pointer dereference, since sinfo is not always set.
Date
4.4-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
@@ -90,6 +90,9 @@ static int pkcs7_check_authattrs(struct
bool want;

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

\
 
 \ /
  Last update: 2017-10-24 15:04    [W:0.863 / U:0.368 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site