From 2c15693a3c355d8296a1828123a864397296460b Mon Sep 17 00:00:00 2001 From: Daniel Stenberg Date: Wed, 20 Jun 2018 23:00:36 +0200 Subject: url: fix dangling conn->data pointer By masking sure to use the *current* easy handle with extracted connections from the cache, and make sure to NULLify the ->data pointer when the connection is put into the cache to make this mistake easier to detect in the future. Reported-by: Will Dietz Fixes #2669 Closes #2672 --- lib/conncache.c | 3 ++- lib/connect.c | 6 ++++-- lib/url.c | 2 +- 3 files changed, 7 insertions(+), 4 deletions(-) diff --git a/lib/conncache.c b/lib/conncache.c index 6bd06582a..066542915 100644 --- a/lib/conncache.c +++ b/lib/conncache.c @@ -6,7 +6,7 @@ * \___|\___/|_| \_\_____| * * Copyright (C) 2012 - 2016, Linus Nielsen Feltzing, - * Copyright (C) 2012 - 2017, Daniel Stenberg, , et al. + * Copyright (C) 2012 - 2018, Daniel Stenberg, , et al. * * This software is licensed as described in the file COPYING, which * you should have received as part of this distribution. The terms @@ -451,6 +451,7 @@ bool Curl_conncache_return_conn(struct connectdata *conn) } CONN_LOCK(data); conn->inuse = FALSE; /* Mark the connection unused */ + conn->data = NULL; /* no owner */ CONN_UNLOCK(data); return (conn_candidate == conn) ? FALSE : TRUE; diff --git a/lib/connect.c b/lib/connect.c index 12ae817e3..41f220268 100644 --- a/lib/connect.c +++ b/lib/connect.c @@ -5,7 +5,7 @@ * | (__| |_| | _ <| |___ * \___|\___/|_| \_\_____| * - * Copyright (C) 1998 - 2017, Daniel Stenberg, , et al. + * Copyright (C) 1998 - 2018, Daniel Stenberg, , et al. * * This software is licensed as described in the file COPYING, which * you should have received as part of this distribution. The terms @@ -1259,9 +1259,11 @@ curl_socket_t Curl_getconnectinfo(struct Curl_easy *data, return CURL_SOCKET_BAD; } - if(connp) + if(connp) { /* only store this if the caller cares for it */ *connp = c; + c->data = data; + } return c->sock[FIRSTSOCKET]; } else diff --git a/lib/url.c b/lib/url.c index d29eddaea..0cab0a303 100644 --- a/lib/url.c +++ b/lib/url.c @@ -965,6 +965,7 @@ static bool extract_if_dead(struct connectdata *conn, use */ bool dead; + conn->data = data; if(conn->handler->connection_check) { /* The protocol has a special method for checking the state of the connection. Use it to check if the connection is dead. */ @@ -979,7 +980,6 @@ static bool extract_if_dead(struct connectdata *conn, } if(dead) { - conn->data = data; infof(data, "Connection %ld seems to be dead!\n", conn->connection_id); Curl_conncache_remove_conn(conn, FALSE); return TRUE; -- cgit v1.2.3