From 289b4a1c0c939ffa58a6ece22a70559ceea882d1 Mon Sep 17 00:00:00 2001
From: Dan Fandrich <dan@coneharvesters.com>
Date: Tue, 14 Mar 2023 11:18:58 -0700
Subject: [PATCH] src: check for NULL pointer passed to _libssh2_get_string

Callers should be protecting against this, but it's prudent to check
here anyway.

Fixes #802
Closes #848
---
 src/misc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/misc.c b/src/misc.c
index 74a6d5a7..a262e09d 100644
--- a/src/misc.c
+++ b/src/misc.c
@@ -834,7 +834,7 @@ int _libssh2_get_string(struct string_buf *buf, unsigned char **outbuf,
                         size_t *outlen)
 {
     uint32_t data_len;
-    if(_libssh2_get_u32(buf, &data_len) != 0) {
+    if(!buf || _libssh2_get_u32(buf, &data_len) != 0) {
         return -1;
     }
     if(!_libssh2_check_length(buf, data_len)) {