[PATCH bpf v4 0/4] bpf, sockmap: Fix sockmap leaking UDP socks

[Michal Luczaj]

Fix for UDP sockets getting leaked during sockmap lookup/release.
Accompanied by selftests updates.

Two Sashiko's concerns to be addressed separately:
https://lore.kernel.org/bpf/20260626205814.BAC3C1F000E9@xxxxxxxxxxxxxxx/

Signed-off-by: Michal Luczaj <mhal@xxxxxxx>
---
Changes in v4:
- selftest: drop redundant `if (err)` [Sashiko]
- Link to v3: https://patch.msgid.link/20260702-sockmap-lookup-udp-leak-v3-0-ff8de8782468@xxxxxxx

Changes in v3:
- selftest: better error handling, ASSERT_*() macros [Sashiko]
- selftest: fix grammar, reorder patches [Kuniyuki]
- Link to v2: https://patch.msgid.link/20260626-sockmap-lookup-udp-leak-v2-0-7e7e201c951a@xxxxxxx

Changes in v2:
- selftest: drop the original, adapt old tests
- fix: change approach to rejecting unbound UDP [Kuniyuki]
- Link to v1: https://patch.msgid.link/20260623-sockmap-lookup-udp-leak-v1-0-05804f9308e4@xxxxxxx

To: Alexei Starovoitov <ast@xxxxxxxxxx>
To: Daniel Borkmann <daniel@xxxxxxxxxxxxx>
To: Andrii Nakryiko <andrii@xxxxxxxxxx>
To: Eduard Zingerman <eddyz87@xxxxxxxxx>
To: Kumar Kartikeya Dwivedi <memxor@xxxxxxxxx>
To: Martin KaFai Lau <martin.lau@xxxxxxxxx>
To: Song Liu <song@xxxxxxxxxx>
To: Yonghong Song <yonghong.song@xxxxxxxxx>
To: Jiri Olsa <jolsa@xxxxxxxxxx>
To: Emil Tsalapatis <emil@xxxxxxxxxxxxxxx>
To: Shuah Khan <shuah@xxxxxxxxxx>
To: John Fastabend <john.fastabend@xxxxxxxxx>
To: Jakub Sitnicki <jakub@xxxxxxxxxxxxxx>
To: Jiayuan Chen <jiayuan.chen@xxxxxxxxx>
To: Eric Dumazet <edumazet@xxxxxxxxxx>
To: Kuniyuki Iwashima <kuniyu@xxxxxxxxxx>
To: Paolo Abeni <pabeni@xxxxxxxxxx>
To: Willem de Bruijn <willemb@xxxxxxxxxx>
To: "David S. Miller" <davem@xxxxxxxxxxxxx>
To: Jakub Kicinski <kuba@xxxxxxxxxx>
To: Simon Horman <horms@xxxxxxxxxx>
To: Cong Wang <cong.wang@xxxxxxxxxxxxx>
Cc: bpf@xxxxxxxxxxxxxxx
Cc: linux-kselftest@xxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
Cc: netdev@xxxxxxxxxxxxxxx

---
Michal Luczaj (4):
      selftests/bpf: Ensure UDP sockets are bound
      bpf, sockmap: Reject unhashed UDP sockets on sockmap update
      selftests/bpf: Adapt sockmap update error handling
      selftests/bpf: Fail unbound UDP on sockmap update

 net/core/sock_map.c                                 |  2 ++
 .../selftests/bpf/prog_tests/sockmap_basic.c        |  6 +++---
 .../selftests/bpf/prog_tests/sockmap_listen.c       | 21 +++++++++++----------
 tools/testing/selftests/bpf/test_maps.c             | 13 ++++++-------
 4 files changed, 22 insertions(+), 20 deletions(-)
---
base-commit: 17566290dc802b03a8127729b19c5962d63a7947
change-id: 20260617-sockmap-lookup-udp-leak-bc4e5c5481d7

Best regards,
--  
Michal Luczaj <mhal@xxxxxxx>