[Python-checkins] bpo-36367: Free buffer if realloc fails in tokenize.c (GH-12442)

[Pablo Galindo]

https://github.com/python/cpython/commit/cb90c89de14aab636739b3e810cf949e47b54a0c
commit: cb90c89de14aab636739b3e810cf949e47b54a0c
branch: master
author: Pablo Galindo <Pablogsal at gmail.com>
committer: GitHub <noreply at github.com>
date: 2019-03-19T17:17:58Z
summary:

bpo-36367: Free buffer if realloc fails in tokenize.c (GH-12442)

files:
M Parser/tokenizer.c

diff --git a/Parser/tokenizer.c b/Parser/tokenizer.c
index 8f0a9c810053..ad054975689e 100644
--- a/Parser/tokenizer.c
+++ b/Parser/tokenizer.c
@@ -649,9 +649,14 @@ translate_newlines(const char *s, int exec_input, struct tok_state *tok) {
     }
     *current = '\0';
     final_length = current - buf + 1;
-    if (final_length < needed_length && final_length)
+    if (final_length < needed_length && final_length) {
         /* should never fail */
-        buf = PyMem_REALLOC(buf, final_length);
+        char* result = PyMem_REALLOC(buf, final_length);
+        if (result == NULL) {
+            PyMem_FREE(buf);
+        }
+        buf = result;
+    }
     return buf;
 }
 
@@ -958,6 +963,7 @@ tok_nextc(struct tok_state *tok)
                 newbuf = (char *)PyMem_REALLOC(newbuf,
                                                newsize);
                 if (newbuf == NULL) {
+                    PyMem_FREE(tok->buf);
                     tok->done = E_NOMEM;
                     tok->cur = tok->inp;
                     return EOF;