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netfilter: nft_socket: Fix a NULL vs IS_ERR() bug in nft_socket_cgroup_subtree_level()

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commit 7052622fcc upstream.

The cgroup_get_from_path() function never returns NULL, it returns error
pointers.  Update the error handling to match.

Fixes: 7f3287db65 ("netfilter: nft_socket: make cgroupsv2 matching work with namespaces")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Acked-by: Florian Westphal <fw@strlen.de>
Acked-by: Pablo Neira Ayuso <pablo@netfilter.org>
Link: https://patch.msgid.link/bbc0c4e0-05cc-4f44-8797-2f4b3920a820@stanley.mountain
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Dan Carpenter 2024-09-14 12:56:51 +03:00 committed by Greg Kroah-Hartman
parent f07e28e4c6
commit 94d6fe6b6e
1 changed files with 2 additions and 2 deletions
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4
net/netfilter/nft_socket.c
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@ -61,8 +61,8 @@ static noinline int nft_socket_cgroup_subtree_level(void)
struct cgroup *cgrp = cgroup_get_from_path("/");
int level;
if (!cgrp)
return -ENOENT;
if (IS_ERR(cgrp))
return PTR_ERR(cgrp);
level = cgrp->level;