bpf: Fix bpf_sk_select_reuseport() memory leak #8345
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Upstream branch: 9d89551 |
As pointed out in the original comment, lookup in sockmap can return a TCP
ESTABLISHED socket. Such TCP socket may have had SO_ATTACH_REUSEPORT_EBPF
set before it was ESTABLISHED. In other words, a non-NULL sk_reuseport_cb
does not imply a non-refcounted socket.
Drop sk's reference in both error paths.
unreferenced object 0xffff888101911800 (size 2048):
comm "test_progs", pid 44109, jiffies 4297131437
hex dump (first 32 bytes):
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
80 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace (crc 9336483b):
__kmalloc_noprof+0x3bf/0x560
__reuseport_alloc+0x1d/0x40
reuseport_alloc+0xca/0x150
reuseport_attach_prog+0x87/0x140
sk_reuseport_attach_bpf+0xc8/0x100
sk_setsockopt+0x1181/0x1990
do_sock_setsockopt+0x12b/0x160
__sys_setsockopt+0x7b/0xc0
__x64_sys_setsockopt+0x1b/0x30
do_syscall_64+0x93/0x180
entry_SYSCALL_64_after_hwframe+0x76/0x7e
Fixes: 64d8529 ("bpf: Allow bpf_map_lookup_elem for SOCKMAP and SOCKHASH")
Signed-off-by: Michal Luczaj <[email protected]>
Reviewed-by: Martin KaFai Lau <[email protected]>
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Upstream branch: 9d89551 |
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At least one diff in series https://patchwork.kernel.org/project/netdevbpf/list/?series=924221 irrelevant now for [Munch({'archived': False, 'project': 399, 'delegate': 121173})] search patterns |
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Pull request for series with
subject: bpf: Fix bpf_sk_select_reuseport() memory leak
version: 1
url: https://patchwork.kernel.org/project/netdevbpf/list/?series=924221