libssh: fix some -Werror=strict-overflow build failures

Add fixes for some of the build failures caused by strict-overflow
warnings. Patches #1, #2, and #4 are upstream. Patch #3 is pending
upstream.

Fixes:
http://autobuild.buildroot.net/results/923/9239f230629ca4e381af5e8f43989997d9bfde99/
http://autobuild.buildroot.net/results/618/6187b92bcdfd9281683c37906ae74f2e0c5e6d0e/
http://autobuild.buildroot.net/results/9eb/9eb5ed92a923f0c038e3d913289eddc1cda1b62f/

Cc: Scott Fan <fancp2007@gmail.com>
Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

1 files changed, 48 insertions, 0 deletions

diff --git a/package/libssh/0001-buffer-Fix-size-comparison-with-count.patch b/package/libssh/0001-buffer-Fix-size-comparison-with-count.patch
new file mode 100644
index 0000000000..88e1bc3b48
--- /dev/null
+++ b/package/libssh/0001-buffer-Fix-size-comparison-with-count.patch
@@ -0,0 +1,48 @@
+From 2aa8c46a853acd4198af16e417ebffd5b0e2c9f4 Mon Sep 17 00:00:00 2001
+From: Andreas Schneider <asn@cryptomilk.org>
+Date: Mon, 1 Oct 2018 20:58:47 +0200
+Subject: [PATCH] buffer: Fix size comparison with count
+
+Signed-off-by: Andreas Schneider <asn@cryptomilk.org>
+Signed-off-by: Baruch Siach <baruch@tkos.co.il>
+---
+Upstream status: commit 9c3ba94960cd5
+
+ src/buffer.c | 6 +++---
+ 1 file changed, 3 insertions(+), 3 deletions(-)
+
+diff --git a/src/buffer.c b/src/buffer.c
+index da6e587fc9e4..b029f202660f 100644
+--- a/src/buffer.c
++++ b/src/buffer.c
+@@ -816,8 +816,8 @@ static int ssh_buffer_pack_allocate_va(struct ssh_buffer_struct *buffer,
+     ssh_string string = NULL;
+     char *cstring = NULL;
+     size_t needed_size = 0;
+-    size_t count;
+     size_t len;
++    int count; /* int for size comparison with argc */
+     int rc = SSH_OK;
+ 
+     for (p = format, count = 0; *p != '\0'; p++, count++) {
+@@ -934,7 +934,7 @@ int ssh_buffer_pack_va(struct ssh_buffer_struct *buffer,
+     char *cstring;
+     bignum b;
+     size_t len;
+-    int count;
++    int count; /* int for size comparison with argc */
+ 
+     for (p = format, count = 0; *p != '\0'; p++, count++) {
+         /* Invalid number of arguments passed */
+@@ -1098,7 +1098,7 @@ int ssh_buffer_unpack_va(struct ssh_buffer_struct *buffer,
+     } o;
+     size_t len, rlen, max_len;
+     va_list ap_copy;
+-    int count;
++    int count; /* int for size comparison with argc */
+ 
+     max_len = ssh_buffer_get_len(buffer);
+ 
+-- 
+2.20.1
+