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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> (From OE-Core rev: bae5ecea1c40847ffc3760173192f85e28ed9d7b) Signed-off-by: Florian Westphal <fw@strlen.de> (cherry picked from commit 54dea548d796653534645c6e3c8577eaf7d77411) Signed-off-by: Divyanshu Rathore <divyanshu.rathore@bmwtechworks.in> Signed-off-by: Steve Sakoman <steve@sakoman.com>
45 lines
1.5 KiB
Diff
45 lines
1.5 KiB
Diff
From 67ad7abf1fe888c650f9e8ed326a499e1456285c Mon Sep 17 00:00:00 2001
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From: Florian Westphal <fw@strlen.de>
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Date: Mon, 15 Sep 2025 14:40:30 +0200
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Subject: [PATCH] examples: genl: fix wrong attribute size
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This example no longer works on more recent kernels:
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genl-family-get
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error: Invalid argument
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dmesg says:
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netlink: 'genl-family-get': attribute type 1 has an invalid length.
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Fix this and also zero out the reserved field in the genl header,
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while not validated yet for dumps this could change.
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Upstream-Status: Backport [https://git.netfilter.org/libmnl/patch/?id=54dea548d796653534645c6e3c8577eaf7d77411]
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Reported-by: Divyanshu Rathore <Divyanshu.Rathore@bmwtechworks.in>
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Signed-off-by: Florian Westphal <fw@strlen.de>
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(cherry picked from commit 54dea548d796653534645c6e3c8577eaf7d77411)
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Signed-off-by: Divyanshu Rathore <divyanshu.rathore@bmwtechworks.in>
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---
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examples/genl/genl-family-get.c | 3 ++-
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1 file changed, 2 insertions(+), 1 deletion(-)
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diff --git a/examples/genl/genl-family-get.c b/examples/genl/genl-family-get.c
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index ba8de12..0c20067 100644
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--- a/examples/genl/genl-family-get.c
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+++ b/examples/genl/genl-family-get.c
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@@ -199,8 +199,9 @@ int main(int argc, char *argv[])
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genl = mnl_nlmsg_put_extra_header(nlh, sizeof(struct genlmsghdr));
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genl->cmd = CTRL_CMD_GETFAMILY;
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genl->version = 1;
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+ genl->reserved = 0;
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- mnl_attr_put_u32(nlh, CTRL_ATTR_FAMILY_ID, GENL_ID_CTRL);
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+ mnl_attr_put_u16(nlh, CTRL_ATTR_FAMILY_ID, GENL_ID_CTRL);
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if (argc >= 2)
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mnl_attr_put_strz(nlh, CTRL_ATTR_FAMILY_NAME, argv[1]);
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else
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--
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2.34.1
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