[PATCH] osmo-ggsn[master]: tun.c: tun_addaddr: Fix segfault and wrong usage of tun_nlattr

[Pau Espin Pedrol]

Review at  https://gerrit.osmocom.org/5347

tun.c: tun_addaddr: Fix segfault and wrong usage of tun_nlattr

First of all, dstaddr can be NULL, avoid copying it in that case.
Second, we want to copy the addr data, not the pointer. I tested it and
the IP was not added (not shown in ip addr) until I copied the content
instead of the address.

Change-Id: I8da637b155f0e913cab6c5b0dde355c9f33375b5
---
M lib/tun.c
1 file changed, 3 insertions(+), 2 deletions(-)


  git pull ssh://gerrit.osmocom.org:29418/osmo-ggsn refs/changes/47/5347/1

diff --git a/lib/tun.c b/lib/tun.c
index d8e4b62..3081575 100644
--- a/lib/tun.c
+++ b/lib/tun.c
@@ -333,8 +333,9 @@
 		return -1;
 	}
 
-	tun_nlattr(&req.n, sizeof(req), IFA_ADDRESS, addr, sizeof(addr));
-	tun_nlattr(&req.n, sizeof(req), IFA_LOCAL, dstaddr, sizeof(dstaddr));
+	tun_nlattr(&req.n, sizeof(req), IFA_ADDRESS, addr, sizeof(*addr));
+	if (dstaddr)
+		tun_nlattr(&req.n, sizeof(req), IFA_LOCAL, dstaddr, sizeof(*dstaddr));
 
 	if ((fd = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE)) < 0) {
 		SYS_ERR(DTUN, LOGL_ERROR, errno, "socket() failed");

-- 
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Gerrit-MessageType: newchange
Gerrit-Change-Id: I8da637b155f0e913cab6c5b0dde355c9f33375b5
Gerrit-PatchSet: 1
Gerrit-Project: osmo-ggsn
Gerrit-Branch: master
Gerrit-Owner: Pau Espin Pedrol <pespin at sysmocom.de>