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From 3ec32595e21849de3165d52e1af48ca3bdf51fab Mon Sep 17 00:00:00 2001
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From: Phil Sutter <psutter@redhat.com>
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Date: Thu, 25 Oct 2018 12:24:30 +0200
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Subject: [PATCH] libnetlink: fix leak and using unused memory on error
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Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1602555
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Upstream Status: iproute2.git commit c60389e4f9ea8
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commit c60389e4f9ea88d7246dbb148d28791d577fe5b4
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Author: Stephen Hemminger <stephen@networkplumber.org>
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Date: Thu Sep 13 12:33:38 2018 -0700
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libnetlink: fix leak and using unused memory on error
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If an error happens in multi-segment message (tc only)
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then report the error and stop processing further responses.
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This also fixes refering to the buffer after free.
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The sequence check is not necessary here because the
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response message has already been validated to be in
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the window of the sequence number of the iov.
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Reported-by: Mahesh Bandewar <mahesh@bandewar.net>
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Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
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Acked-by: Mahesh Bandewar <maheshb@google.com>
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---
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lib/libnetlink.c | 23 +++++++++--------------
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1 file changed, 9 insertions(+), 14 deletions(-)
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diff --git a/lib/libnetlink.c b/lib/libnetlink.c
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index 928de1d..5868092 100644
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--- a/lib/libnetlink.c
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+++ b/lib/libnetlink.c
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@@ -617,7 +617,6 @@ static int __rtnl_talk_iov(struct rtnl_handle *rtnl, struct iovec *iov,
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msg.msg_iovlen = 1;
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i = 0;
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while (1) {
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-next:
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status = rtnl_recvmsg(rtnl->fd, &msg, &buf;;
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++i;
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@@ -660,27 +659,23 @@ next:
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if (l < sizeof(struct nlmsgerr)) {
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fprintf(stderr, "ERROR truncated\n");
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- } else if (!err->error) {
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+ free(buf);
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+ return -1;
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+ }
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+
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+ if (!err->error)
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/* check messages from kernel */
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nl_dump_ext_ack(h, errfn);
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- if (answer)
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- *answer = (struct nlmsghdr *)buf;
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- else
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- free(buf);
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- if (h->nlmsg_seq == seq)
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- return 0;
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- else if (i < iovlen)
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- goto next;
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- return 0;
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- }
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-
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if (rtnl->proto != NETLINK_SOCK_DIAG &&
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show_rtnl_err)
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rtnl_talk_error(h, err, errfn);
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errno = -err->error;
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- free(buf);
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+ if (answer)
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+ *answer = (struct nlmsghdr *)buf;
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+ else
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+ free(buf);
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return -i;
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}
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--
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1.8.3.1
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