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zebra: Check for netlink message next fault

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NLMSG_NEXT decrements the buffer length (status) by
the header msg length (nlmsg_len) everytime its called.
If nlmsg_len isn't accurate and set to be larger than
what it should represent, it will cause status to
decrement passed 0. This makes NLMSG_NEXT return a
pointer that references an inaccessible address.
When that is passed to NLMSG_OK, it segfaults.

Add a check to verify that there is still something to read
before we try to.

Signed-off-by: Stephen Worley <sworley@cumulusnetworks.com>
This commit is contained in:
Stephen Worley 2018-07-26 16:12:05 -04:00
parent 4b22e6bc05
commit e6a0e0d141
1 changed files with 1 additions and 1 deletions
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zebra/kernel_netlink.c
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@ -638,7 +638,7 @@ int netlink_parse_info(int (*filter)(struct nlmsghdr *, ns_id_t, int),
read_in++;
for (h = (struct nlmsghdr *)buf;
NLMSG_OK(h, (unsigned int)status);
(status >= 0 && NLMSG_OK(h, (unsigned int)status));
h = NLMSG_NEXT(h, status)) {
/* Finish of reading. */
if (h->nlmsg_type == NLMSG_DONE)