Fix NULL pointer dereference in open_memstream()

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Hi,

Current version of uClibc-ng has issue in open_memstream() function.
If the cookie variable is NULL (due malloc() fail) then null pointer is
dereferenced after if block.

The attached patch fixes this issue.
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Best regards,
Eugene

<div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr">Hi,<div><br></div><div>Current version of uClibc-ng has issue in open_memstream() function.</div><div>If the cookie variable is NULL (due malloc() fail) then null pointer is dereferenced after if block.</div><div><br></div><div>The attached patch fixes this issue.<br clear="all"><div>-- <br></div><div dir="ltr" class="gmail_signature"><div dir="ltr"><div><div><span><div>Best regards,<br></div>Eugene</span></div></div></div></div></div></div></div></div></div>

libc/stdio/open_memstream.c

@@ -156,9 +156,10 @@ FILE *open_memstream(char **bufloc, size_t *sizeloc)
 			__STDIO_STREAM_VALIDATE(fp);
 			return fp;
 		}
+
+		free(cookie->buf);
 	}
 
-	free(cookie->buf);
  EXIT_cookie:
 	free(cookie);