fetchmail/fetchmail-oauth2-c-calculate-and-pass-in-correct-buffer-size-to-to64frombits.patch

From: Matthew Ogilvie <mmogilvi+fml@zoho.com>
Date: Fri, 21 Dec 2018 09:01:40 -0700
Subject: oauth2.c: calculate and pass in correct buffer size to to64frombits()
Git-repo: https://gitlab.com/fetchmail/fetchmail.git
Git-commit: 914ee333c73baa3c58d1e819ff4d66052e663335

Also allocate the actual needed size instead of an excessively large
approximate size.

---
 oauth2.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

--- a/oauth2.c
+++ b/oauth2.c
@@ -34,6 +34,7 @@ char *get_oauth2_string(struct query *ct
     int oauth2len;
 
     char *oauth2b64;
+    size_t oauth2b64alloc;
 
     oauth2len = strlen(ctl->remotename) + strlen(ctl->password) + 32;
     oauth2str = (char *)xmalloc(oauth2len);
@@ -52,8 +53,9 @@ char *get_oauth2_string(struct query *ct
 		 ctl->password);
     }
 
-    oauth2b64 = (char *)xmalloc(2*strlen(oauth2str)+8);
-    to64frombits(oauth2b64, oauth2str, strlen(oauth2str), oauth2len);
+    oauth2b64alloc = query_to64_outsize(strlen(oauth2str));
+    oauth2b64 = (char *)xmalloc(oauth2b64alloc);
+    to64frombits(oauth2b64, oauth2str, strlen(oauth2str), oauth2b64alloc);
 
     memset(oauth2str, 0x55, strlen(oauth2str));
     free(oauth2str);