curl: fix memory leak reading --writeout from file

If another string had been set first, the writout function for reading
the syntax from file would leak the previously allocated memory.

Reported-by: Brian Carpenter
Fixes #3322
Closes #3330

diff --git a/src/tool_getparam.c b/src/tool_getparam.c
index cd21f774cd091b6aeb410ae9beb1ebc12e7102c3..c0d3a84f236dd75f70a3b65d1146bc4599264fa5 100644 (file)
--- a/src/tool_getparam.c
+++ b/src/tool_getparam.c
@@ -2066,6 +2066,7 @@ ParameterError getparameter(const char *flag, /* f or -long-flag */
           fname = nextarg;
           file = fopen(nextarg, FOPEN_READTEXT);
         }
+        Curl_safefree(config->writeout);
         err = file2string(&config->writeout, file);
         if(file && (file != stdin))
           fclose(file);