[gnurl] 211/411: strerror: fix null deref on winapi out-of-memory

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nikita pushed a commit to branch master
in repository gnurl.

commit 9a13f7c2a7ca5fca99622a6feeb29abc3b05d713
Author: Jay Satiro <raysatiro@yahoo.com>
AuthorDate: Thu Oct 1 13:34:59 2020 -0400

    strerror: fix null deref on winapi out-of-memory
    
    Follow-up to bed5f84 from several days ago.
    
    Ref: https://github.com/curl/curl/pull/6005
---
 lib/strerror.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/lib/strerror.c b/lib/strerror.c
index fef5c2bca..0a3b73844 100644
--- a/lib/strerror.c
+++ b/lib/strerror.c
@@ -670,9 +670,11 @@ get_winapi_error(int err, char *buf, size_t buflen)
                       FORMAT_MESSAGE_IGNORE_INSERTS), NULL, err,
                      LANG_NEUTRAL, wbuf, sizeof(wbuf)/sizeof(TCHAR), NULL)) {
       char *msg = curlx_convert_tchar_to_UTF8(wbuf);
-      strncpy(buf, msg, buflen - 1);
-      buf[buflen-1] = '\0';
-      curlx_unicodefree(msg);
+      if(msg) {
+        strncpy(buf, msg, buflen - 1);
+        buf[buflen-1] = '\0';
+        curlx_unicodefree(msg);
+      }
     }
   }
 

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