From af1e591eeec4fbb47e1e050a562d5d5237d3c563 Mon Sep 17 00:00:00 2001
From: Will Cosgrove <will@panic.com>
Date: Tue, 14 Feb 2023 09:13:04 -0800
Subject: [PATCH] Add NULL session check to _libssh2_error_flags() (#796)

Don't dereference null if a null session happens to make it into _libssh2_error_flags()
---
 src/misc.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/misc.c b/src/misc.c
index 0c84fa4b..84d165c2 100644
--- a/src/misc.c
+++ b/src/misc.c
@@ -65,6 +65,12 @@
 int _libssh2_error_flags(LIBSSH2_SESSION* session, int errcode,
                          const char *errmsg, int errflags)
 {
+    if(session == NULL) {
+        if(errmsg != NULL)
+            fprintf(stderr, "Session is NULL, error: %s\n", errmsg);
+        return errcode;
+    }
+
     if(session->err_flags & LIBSSH2_ERR_FLAG_DUP)
         LIBSSH2_FREE(session, (char *)session->err_msg);