diff mbox series

[14/36] slirp: check sscanf result when emulating ident

Message ID 20190723170104.4327-15-mdroth@linux.vnet.ibm.com
State New
Headers show
Series Patch Round-up for stable 3.1.1, freeze on 2019-07-29 | expand

Commit Message

Michael Roth July 23, 2019, 5 p.m. UTC 
From: William Bowling <will@wbowling.info>

When emulating ident in tcp_emu, if the strchr checks passed but the
sscanf check failed, two uninitialized variables would be copied and
sent in the reply, so move this code inside the if(sscanf()) clause.

Signed-off-by: William Bowling <will@wbowling.info>
Cc: qemu-stable@nongnu.org
Cc: secalert@redhat.com
Message-Id: <1551476756-25749-1-git-send-email-will@wbowling.info>
Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
(cherry picked from commit d3222975c7d6cda9e25809dea05241188457b113)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
---
 slirp/tcp_subr.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)
diff mbox series

Patch

diff --git a/slirp/tcp_subr.c b/slirp/tcp_subr.c
index fa61349cbb..c27e0d158d 100644
--- a/slirp/tcp_subr.c
+++ b/slirp/tcp_subr.c
@@ -657,12 +657,12 @@  tcp_emu(struct socket *so, struct mbuf *m)
 							break;
 						}
 					}
+					so_rcv->sb_cc = snprintf(so_rcv->sb_data,
+								 so_rcv->sb_datalen,
+								 "%d,%d\r\n", n1, n2);
+					so_rcv->sb_rptr = so_rcv->sb_data;
+					so_rcv->sb_wptr = so_rcv->sb_data + so_rcv->sb_cc;
 				}
-                                so_rcv->sb_cc = snprintf(so_rcv->sb_data,
-                                                         so_rcv->sb_datalen,
-                                                         "%d,%d\r\n", n1, n2);
-				so_rcv->sb_rptr = so_rcv->sb_data;
-				so_rcv->sb_wptr = so_rcv->sb_data + so_rcv->sb_cc;
 			}
 			m_free(m);
 			return 0;