libssh: patch security issue

Fixes:
CVE-2020-16135

Signed-off-by: Jan Pavlinec <jan.pavlinec@nic.cz>

libs/libssh/Makefile

@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=libssh
 PKG_VERSION:=0.9.4
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.xz
 PKG_SOURCE_URL:=https://www.libssh.org/files/0.9/

libs/libssh/patches/0003-CVE-2020-16135.patch

@@ -0,0 +1,165 @@
+From 1493b4466fa394b321d196ad63dd6a4fa395d337 Mon Sep 17 00:00:00 2001
+From: Andreas Schneider <asn@cryptomilk.org>
+Date: Wed, 3 Jun 2020 10:04:09 +0200
+Subject: [PATCH 1/4] sftpserver: Add missing NULL check for ssh_buffer_new()
+
+Thanks to Ramin Farajpour Cami for spotting this.
+
+Fixes T232
+
+Signed-off-by: Andreas Schneider <asn@cryptomilk.org>
+---
+ src/sftpserver.c | 6 ++++++
+ 1 file changed, 6 insertions(+)
+
+diff --git a/src/sftpserver.c b/src/sftpserver.c
+index 5a2110e5..b639a2ce 100644
+--- a/src/sftpserver.c
++++ b/src/sftpserver.c
+@@ -67,6 +67,12 @@ sftp_client_message sftp_get_client_message(sftp_session sftp) {
+ 
+   /* take a copy of the whole packet */
+   msg->complete_message = ssh_buffer_new();
++  if (msg->complete_message == NULL) {
++      ssh_set_error_oom(session);
++      sftp_client_message_free(msg);
++      return NULL;
++  }
++
+   ssh_buffer_add_data(msg->complete_message,
+                       ssh_buffer_get(payload),
+                       ssh_buffer_get_len(payload));
+-- 
+GitLab
+
+
+From dbfb7f44aa905a7103bdde9a198c1e9b0f480c2e Mon Sep 17 00:00:00 2001
+From: Andreas Schneider <asn@cryptomilk.org>
+Date: Wed, 3 Jun 2020 10:05:51 +0200
+Subject: [PATCH 2/4] sftpserver: Add missing return check for
+ ssh_buffer_add_data()
+
+Signed-off-by: Andreas Schneider <asn@cryptomilk.org>
+---
+ src/sftpserver.c | 11 ++++++++---
+ 1 file changed, 8 insertions(+), 3 deletions(-)
+
+diff --git a/src/sftpserver.c b/src/sftpserver.c
+index b639a2ce..9117f155 100644
+--- a/src/sftpserver.c
++++ b/src/sftpserver.c
+@@ -73,9 +73,14 @@ sftp_client_message sftp_get_client_message(sftp_session sftp) {
+       return NULL;
+   }
+ 
+-  ssh_buffer_add_data(msg->complete_message,
+-                      ssh_buffer_get(payload),
+-                      ssh_buffer_get_len(payload));
++  rc = ssh_buffer_add_data(msg->complete_message,
++                           ssh_buffer_get(payload),
++                           ssh_buffer_get_len(payload));
++  if (rc < 0) {
++      ssh_set_error_oom(session);
++      sftp_client_message_free(msg);
++      return NULL;
++  }
+ 
+   ssh_buffer_get_u32(payload, &msg->id);
+ 
+-- 
+GitLab
+
+
+From 65ae496222018221080dd753a52f6d70bf3ca5f3 Mon Sep 17 00:00:00 2001
+From: Andreas Schneider <asn@cryptomilk.org>
+Date: Wed, 3 Jun 2020 10:10:11 +0200
+Subject: [PATCH 3/4] buffer: Reformat ssh_buffer_add_data()
+
+Signed-off-by: Andreas Schneider <asn@cryptomilk.org>
+---
+ src/buffer.c | 35 ++++++++++++++++++-----------------
+ 1 file changed, 18 insertions(+), 17 deletions(-)
+
+diff --git a/src/buffer.c b/src/buffer.c
+index a2e6246a..476bc135 100644
+--- a/src/buffer.c
++++ b/src/buffer.c
+@@ -299,28 +299,29 @@ int ssh_buffer_reinit(struct ssh_buffer_struct *buffer)
+  */
+ int ssh_buffer_add_data(struct ssh_buffer_struct *buffer, const void *data, uint32_t len)
+ {
+-  buffer_verify(buffer);
++    buffer_verify(buffer);
+ 
+-  if (data == NULL) {
+-      return -1;
+-  }
++    if (data == NULL) {
++        return -1;
++    }
+ 
+-  if (buffer->used + len < len) {
+-    return -1;
+-  }
++    if (buffer->used + len < len) {
++        return -1;
++    }
+ 
+-  if (buffer->allocated < (buffer->used + len)) {
+-    if(buffer->pos > 0)
+-      buffer_shift(buffer);
+-    if (realloc_buffer(buffer, buffer->used + len) < 0) {
+-      return -1;
++    if (buffer->allocated < (buffer->used + len)) {
++        if (buffer->pos > 0) {
++            buffer_shift(buffer);
++        }
++        if (realloc_buffer(buffer, buffer->used + len) < 0) {
++            return -1;
++        }
+     }
+-  }
+ 
+-  memcpy(buffer->data+buffer->used, data, len);
+-  buffer->used+=len;
+-  buffer_verify(buffer);
+-  return 0;
++    memcpy(buffer->data + buffer->used, data, len);
++    buffer->used += len;
++    buffer_verify(buffer);
++    return 0;
+ }
+ 
+ /**
+-- 
+GitLab
+
+
+From df0acab3a077bd8ae015e3e8b4c71ff31b5900fe Mon Sep 17 00:00:00 2001
+From: Andreas Schneider <asn@cryptomilk.org>
+Date: Wed, 3 Jun 2020 10:11:21 +0200
+Subject: [PATCH 4/4] buffer: Add NULL check for 'buffer' argument
+
+Signed-off-by: Andreas Schneider <asn@cryptomilk.org>
+---
+ src/buffer.c | 4 ++++
+ 1 file changed, 4 insertions(+)
+
+diff --git a/src/buffer.c b/src/buffer.c
+index 476bc135..ce12f491 100644
+--- a/src/buffer.c
++++ b/src/buffer.c
+@@ -299,6 +299,10 @@ int ssh_buffer_reinit(struct ssh_buffer_struct *buffer)
+  */
+ int ssh_buffer_add_data(struct ssh_buffer_struct *buffer, const void *data, uint32_t len)
+ {
++    if (buffer == NULL) {
++        return -1;
++    }
++
+     buffer_verify(buffer);
+ 
+     if (data == NULL) {
+-- 
+GitLab
+