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From 9069838b30fb3b48af0123e39f664cea683254a5 Mon Sep 17 00:00:00 2001
From: Daniel Stenberg <daniel@haxx.se>
Date: Tue, 3 Sep 2019 22:59:32 +0200
Subject: [PATCH] security:read_data fix bad realloc()
... that could end up a double-free
CVE-2019-5481
Bug: https://curl.haxx.se/docs/CVE-2019-5481.html
---
lib/security.c | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)
diff --git a/lib/security.c b/lib/security.c
index 550ea2da8d..c5e4e135df 100644
--- a/lib/security.c
+++ b/lib/security.c
@@ -191,7 +191,6 @@ static CURLcode read_data(struct connectdata *conn,
struct krb5buffer *buf)
{
int len;
- void *tmp = NULL;
CURLcode result;
result = socket_read(fd, &len, sizeof(len));
@@ -201,12 +200,11 @@ static CURLcode read_data(struct connectdata *conn,
if(len) {
/* only realloc if there was a length */
len = ntohl(len);
- tmp = Curl_saferealloc(buf->data, len);
+ buf->data = Curl_saferealloc(buf->data, len);
}
- if(tmp == NULL)
+ if(!len || !buf->data)
return CURLE_OUT_OF_MEMORY;
- buf->data = tmp;
result = socket_read(fd, buf->data, len);
if(result)
return result;
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