From fa8b9f8fa8a6762bb0151e65a11eca9dca7aca83 Mon Sep 17 00:00:00 2001 From: Andrea Claudi Date: Mon, 29 Apr 2019 20:07:22 +0200 Subject: [PATCH] ss: Don't leak fd in tcp_show_netlink_file() Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1465646 Upstream Status: iproute2.git commit 4b45ae221e949 commit 4b45ae221e949b604d968a10d5d996c7c7cec1a6 Author: Phil Sutter Date: Thu Aug 17 19:09:30 2017 +0200 ss: Don't leak fd in tcp_show_netlink_file() Signed-off-by: Phil Sutter --- misc/ss.c | 32 ++++++++++++++++++++------------ 1 file changed, 20 insertions(+), 12 deletions(-) diff --git a/misc/ss.c b/misc/ss.c index 86defc71fabc4..eb46e0c4b95fb 100644 --- a/misc/ss.c +++ b/misc/ss.c @@ -2764,41 +2764,44 @@ static int tcp_show_netlink_file(struct filter *f) { FILE *fp; char buf[16384]; + int err = -1; if ((fp = fopen(getenv("TCPDIAG_FILE"), "r")) == NULL) { perror("fopen($TCPDIAG_FILE)"); - return -1; + return err; } while (1) { - int status, err; + int status, err2; struct nlmsghdr *h = (struct nlmsghdr *)buf; struct sockstat s = {}; status = fread(buf, 1, sizeof(*h), fp); if (status < 0) { perror("Reading header from $TCPDIAG_FILE"); - return -1; + break; } if (status != sizeof(*h)) { perror("Unexpected EOF reading $TCPDIAG_FILE"); - return -1; + break; } status = fread(h+1, 1, NLMSG_ALIGN(h->nlmsg_len-sizeof(*h)), fp); if (status < 0) { perror("Reading $TCPDIAG_FILE"); - return -1; + break; } if (status + sizeof(*h) < h->nlmsg_len) { perror("Unexpected EOF reading $TCPDIAG_FILE"); - return -1; + break; } /* The only legal exit point */ - if (h->nlmsg_type == NLMSG_DONE) - return 0; + if (h->nlmsg_type == NLMSG_DONE) { + err = 0; + break; + } if (h->nlmsg_type == NLMSG_ERROR) { struct nlmsgerr *err = (struct nlmsgerr *)NLMSG_DATA(h); @@ -2809,7 +2812,7 @@ static int tcp_show_netlink_file(struct filter *f) errno = -err->error; perror("TCPDIAG answered"); } - return -1; + break; } parse_diag_msg(h, &s); @@ -2818,10 +2821,15 @@ static int tcp_show_netlink_file(struct filter *f) if (f && f->f && run_ssfilter(f->f, &s) == 0) continue; - err = inet_show_sock(h, &s); - if (err < 0) - return err; + err2 = inet_show_sock(h, &s); + if (err2 < 0) { + err = err2; + break; + } } + + fclose(fp); + return err; } static int tcp_show(struct filter *f) -- 2.20.1