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bpf: Fix use-after-free in offloaded map/prog info fill

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When querying info for an offloaded BPF map or program,
bpf_map_offload_info_fill_ns() and bpf_prog_offload_info_fill_ns()
obtain the network namespace with get_net(dev_net(offmap->netdev)).
However, the associated netdev's netns may be racing with teardown
during netns destruction. If the netns refcount has already reached 0,
get_net() performs a refcount_t increment on 0, triggering:

  refcount_t: addition on 0; use-after-free.

Although rtnl_lock and bpf_devs_lock ensure the netdev pointer remains
valid, they cannot prevent the netns refcount from reaching zero.

Fix this by using maybe_get_net() instead of get_net(). maybe_get_net()
uses refcount_inc_not_zero() and returns NULL if the refcount is already
zero, which causes ns_get_path_cb() to fail and the caller to return
-ENOENT -- the correct behavior when the netns is being destroyed.

Fixes: 675fc275a3 ("bpf: offload: report device information for offloaded programs")
Fixes: 52775b33bb ("bpf: offload: report device information about offloaded maps")
Reported-by: Yinhao Hu <dddddd@hust.edu.cn>
Reported-by: Kaiyan Mei <M202472210@hust.edu.cn>
Reviewed-by: Dongliang Mu <dzm91@hust.edu.cn>
Closes: https://lore.kernel.org/bpf/f0aa3678-79c9-47ae-9e8c-02a3d1df160a@hust.edu.cn/
Signed-off-by: Jiayuan Chen <jiayuan.chen@linux.dev>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/r/20260409023733.168050-1-jiayuan.chen@linux.dev
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Jiayuan Chen 2026-04-09 10:37:32 +08:00 committed by Alexei Starovoitov
parent 8697bdd67b
commit a0c584fc18
1 changed files with 4 additions and 6 deletions
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10
kernel/bpf/offload.c
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@ -435,9 +435,8 @@ static struct ns_common *bpf_prog_offload_info_fill_ns(void *private_data)
if (aux->offload) {
args->info->ifindex = aux->offload->netdev->ifindex;
net = dev_net(aux->offload->netdev);
get_net(net);
ns = &net->ns;
net = maybe_get_net(dev_net(aux->offload->netdev));
ns = net ? &net->ns : NULL;
} else {
args->info->ifindex = 0;
ns = NULL;
@ -647,9 +646,8 @@ static struct ns_common *bpf_map_offload_info_fill_ns(void *private_data)
if (args->offmap->netdev) {
args->info->ifindex = args->offmap->netdev->ifindex;
net = dev_net(args->offmap->netdev);
get_net(net);
ns = &net->ns;
net = maybe_get_net(dev_net(args->offmap->netdev));
ns = net ? &net->ns : NULL;
} else {
args->info->ifindex = 0;
ns = NULL;