rxrpc: Fix memory leak in rxrpc_lookup_local
Commit
9ebeddef58c4 ("rxrpc: rxrpc_peer needs to hold a ref on the rxrpc_local record")
Then release ref in __rxrpc_put_peer and rxrpc_put_peer_locked.
struct rxrpc_peer *rxrpc_alloc_peer(struct rxrpc_local *local, gfp_t gfp)
- peer->local = local;
+ peer->local = rxrpc_get_local(local);
rxrpc_discard_prealloc also need ref release in discarding.
syzbot report:
BUG: memory leak
unreferenced object 0xffff8881080ddc00 (size 256):
comm "syz-executor339", pid 8462, jiffies
4294942238 (age 12.350s)
hex dump (first 32 bytes):
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00 00 00 00 0a 00 00 00 00 c0 00 08 81 88 ff ff ................
backtrace:
[<
000000002b6e495f>] kmalloc include/linux/slab.h:552 [inline]
[<
000000002b6e495f>] kzalloc include/linux/slab.h:682 [inline]
[<
000000002b6e495f>] rxrpc_alloc_local net/rxrpc/local_object.c:79 [inline]
[<
000000002b6e495f>] rxrpc_lookup_local+0x1c1/0x760 net/rxrpc/local_object.c:244
[<
000000006b43a77b>] rxrpc_bind+0x174/0x240 net/rxrpc/af_rxrpc.c:149
[<
00000000fd447a55>] afs_open_socket+0xdb/0x200 fs/afs/rxrpc.c:64
[<
000000007fd8867c>] afs_net_init+0x2b4/0x340 fs/afs/main.c:126
[<
0000000063d80ec1>] ops_init+0x4e/0x190 net/core/net_namespace.c:152
[<
00000000073c5efa>] setup_net+0xde/0x2d0 net/core/net_namespace.c:342
[<
00000000a6744d5b>] copy_net_ns+0x19f/0x3e0 net/core/net_namespace.c:483
[<
0000000017d3aec3>] create_new_namespaces+0x199/0x4f0 kernel/nsproxy.c:110
[<
00000000186271ef>] unshare_nsproxy_namespaces+0x9b/0x120 kernel/nsproxy.c:226
[<
000000002de7bac4>] ksys_unshare+0x2fe/0x5c0 kernel/fork.c:2957
[<
00000000349b12ba>] __do_sys_unshare kernel/fork.c:3025 [inline]
[<
00000000349b12ba>] __se_sys_unshare kernel/fork.c:3023 [inline]
[<
00000000349b12ba>] __x64_sys_unshare+0x12/0x20 kernel/fork.c:3023
[<
000000006d178ef7>] do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
[<
00000000637076d4>] entry_SYSCALL_64_after_hwframe+0x44/0xa9
Fixes:
9ebeddef58c4 ("rxrpc: rxrpc_peer needs to hold a ref on the rxrpc_local record")
Signed-off-by: Takeshi Misawa <jeliantsurux@gmail.com>
Reported-and-tested-by: syzbot+305326672fed51b205f7@syzkaller.appspotmail.com
Signed-off-by: David Howells <dhowells@redhat.com>
Link: https://lore.kernel.org/r/161183091692.3506637.3206605651502458810.stgit@warthog.procyon.org.uk
Signed-off-by: Jakub Kicinski <kuba@kernel.org>