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From 67ad7abf1fe888c650f9e8ed326a499e1456285c Mon Sep 17 00:00:00 2001
From: Florian Westphal <fw@strlen.de>
Date: Mon, 15 Sep 2025 14:40:30 +0200
Subject: [PATCH] examples: genl: fix wrong attribute size
This example no longer works on more recent kernels:
genl-family-get
error: Invalid argument
dmesg says:
netlink: 'genl-family-get': attribute type 1 has an invalid length.
Fix this and also zero out the reserved field in the genl header,
while not validated yet for dumps this could change.
Upstream-Status: Backport [https://git.netfilter.org/libmnl/patch/?id=54dea548d796653534645c6e3c8577eaf7d77411]
Reported-by: Divyanshu Rathore <Divyanshu.Rathore@bmwtechworks.in>
Signed-off-by: Florian Westphal <fw@strlen.de>
(cherry picked from commit 54dea548d796653534645c6e3c8577eaf7d77411)
Signed-off-by: Divyanshu Rathore <divyanshu.rathore@bmwtechworks.in>
---
examples/genl/genl-family-get.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/examples/genl/genl-family-get.c b/examples/genl/genl-family-get.c
index ba8de12..0c20067 100644
--- a/examples/genl/genl-family-get.c
+++ b/examples/genl/genl-family-get.c
@@ -199,8 +199,9 @@ int main(int argc, char *argv[])
genl = mnl_nlmsg_put_extra_header(nlh, sizeof(struct genlmsghdr));
genl->cmd = CTRL_CMD_GETFAMILY;
genl->version = 1;
+ genl->reserved = 0;
- mnl_attr_put_u32(nlh, CTRL_ATTR_FAMILY_ID, GENL_ID_CTRL);
+ mnl_attr_put_u16(nlh, CTRL_ATTR_FAMILY_ID, GENL_ID_CTRL);
if (argc >= 2)
mnl_attr_put_strz(nlh, CTRL_ATTR_FAMILY_NAME, argv[1]);
else
--
2.34.1
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