From cbd8d5c44701f97eccd6602e3d745fc37a8d7ff4 Mon Sep 17 00:00:00 2001
From: Kamil Dudka <kdudka@redhat.com>
Date: Tue, 19 Mar 2019 13:29:35 +0100
Subject: [PATCH 1/2] Resolves: CVE-2019-3857 - fix integer overflow in SSH
 packet processing channel

... resulting in out of bounds write

Upstream-Patch: https://libssh2.org/1.8.0-CVE/CVE-2019-3857.patch
---
 include/libssh2.h | 12 ++++++++++++
 src/packet.c      | 11 +++++++++--
 2 files changed, 21 insertions(+), 2 deletions(-)

diff --git a/include/libssh2.h b/include/libssh2.h
index 34d2842..e25c380 100644
--- a/include/libssh2.h
+++ b/include/libssh2.h
@@ -145,6 +145,18 @@ typedef int libssh2_socket_t;
 #define LIBSSH2_INVALID_SOCKET -1
 #endif /* WIN32 */
 
+#ifndef SIZE_MAX
+#if _WIN64
+#define SIZE_MAX 0xFFFFFFFFFFFFFFFF
+#else
+#define SIZE_MAX 0xFFFFFFFF
+#endif
+#endif
+
+#ifndef UINT_MAX
+#define UINT_MAX 0xFFFFFFFF
+#endif
+
 /*
  * Determine whether there is small or large file support on windows.
  */
diff --git a/src/packet.c b/src/packet.c
index 5f1feb8..aa10633 100644
--- a/src/packet.c
+++ b/src/packet.c
@@ -815,8 +815,15 @@ _libssh2_packet_add(LIBSSH2_SESSION * session, unsigned char *data,
                         /* set signal name (without SIG prefix) */
                         uint32_t namelen =
                             _libssh2_ntohu32(data + 9 + sizeof("exit-signal"));
-                        channelp->exit_signal =
-                            LIBSSH2_ALLOC(session, namelen + 1);
+
+                        if(namelen <= UINT_MAX - 1) {
+                            channelp->exit_signal =
+                                LIBSSH2_ALLOC(session, namelen + 1);
+                        }
+                        else {
+                            channelp->exit_signal = NULL;
+                        }
+
                         if (!channelp->exit_signal)
                             rc = _libssh2_error(session, LIBSSH2_ERROR_ALLOC,
                                                 "memory for signal name");
-- 
2.17.2


From 0708c71871976ccf6d45fd0971a079d271413f92 Mon Sep 17 00:00:00 2001
From: Michael Buckley <michael@buckleyisms.com>
Date: Mon, 18 Mar 2019 15:07:12 -0700
Subject: [PATCH 2/2] Move fallback SIZE_MAX and UINT_MAX to libssh2_priv.h

Upstream-commit: 31d0b1a8530b959bd12c2074dc6e883e1eda8207
Signed-off-by: Kamil Dudka <kdudka@redhat.com>
---
 include/libssh2.h  | 12 ------------
 src/libssh2_priv.h | 12 ++++++++++++
 2 files changed, 12 insertions(+), 12 deletions(-)

diff --git a/include/libssh2.h b/include/libssh2.h
index e25c380..34d2842 100644
--- a/include/libssh2.h
+++ b/include/libssh2.h
@@ -145,18 +145,6 @@ typedef int libssh2_socket_t;
 #define LIBSSH2_INVALID_SOCKET -1
 #endif /* WIN32 */
 
-#ifndef SIZE_MAX
-#if _WIN64
-#define SIZE_MAX 0xFFFFFFFFFFFFFFFF
-#else
-#define SIZE_MAX 0xFFFFFFFF
-#endif
-#endif
-
-#ifndef UINT_MAX
-#define UINT_MAX 0xFFFFFFFF
-#endif
-
 /*
  * Determine whether there is small or large file support on windows.
  */
diff --git a/src/libssh2_priv.h b/src/libssh2_priv.h
index b4296a2..bb5d1a5 100644
--- a/src/libssh2_priv.h
+++ b/src/libssh2_priv.h
@@ -146,6 +146,18 @@ static inline int writev(int sock, struct iovec *iov, int nvecs)
 
 #endif
 
+#ifndef SIZE_MAX
+#if _WIN64
+#define SIZE_MAX 0xFFFFFFFFFFFFFFFF
+#else
+#define SIZE_MAX 0xFFFFFFFF
+#endif
+#endif
+
+#ifndef UINT_MAX
+#define UINT_MAX 0xFFFFFFFF
+#endif
+
 /* RFC4253 section 6.1 Maximum Packet Length says:
  *
  * "All implementations MUST be able to process packets with
-- 
2.17.2