From 5efc10d24e1fb7f59817f007c18219dfc46bf457 Mon Sep 17 00:00:00 2001
From: Eugene Yudin <e.yudin@ndmsystems.com>
Date: Fri, 22 Feb 2019 19:47:53 +0300
Subject: 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.
--
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 | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'libc')

diff --git a/libc/stdio/open_memstream.c b/libc/stdio/open_memstream.c
index 17ef191cb..71a84138d 100644
--- a/libc/stdio/open_memstream.c
+++ b/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);
 
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