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linux/net/rxrpc
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Takeshi Misawa b8323f7288 rxrpc: Fix memory leak in rxrpc_lookup_local 
Commit 9ebeddef58 ("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: 9ebeddef58 ("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>
2021-01-28 13:12:14 -08:00
..
af_rxrpc.c rxrpc: Impose a maximum number of client calls 2020-09-08 21:10:45 +01:00
ar-internal.h rxrpc: Ask the security class how much space to allow in a packet 2020-11-23 19:53:11 +00:00
call_accept.c rxrpc: Fix memory leak in rxrpc_lookup_local 2021-01-28 13:12:14 -08:00
call_event.c
call_object.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-10-08 15:44:50 -07:00
conn_client.c rxrpc: Merge prime_packet_security into init_connection_security 2020-11-23 18:09:30 +00:00
conn_event.c rxrpc: Merge prime_packet_security into init_connection_security 2020-11-23 18:09:30 +00:00
conn_object.c rxrpc: Ask the security class how much space to allow in a packet 2020-11-23 19:53:11 +00:00
conn_service.c rxrpc: Don't retain the server key in the connection 2020-11-23 18:09:29 +00:00
input.c rxrpc: Call state should be read with READ_ONCE() under some circumstances 2021-01-13 10:38:20 -08:00
insecure.c rxrpc: Ask the security class how much space to allow in a packet 2020-11-23 19:53:11 +00:00
Kconfig docs: networking: convert rxrpc.txt to ReST 2020-04-30 12:56:38 -07:00
key.c rxrpc: Fix handling of an unsupported token type in rxrpc_read() 2021-01-13 10:38:00 -08:00
local_event.c
local_object.c rxrpc: Rewrite the client connection manager 2020-09-08 21:11:43 +01:00
Makefile rxrpc: Split the server key type (rxrpc_s) into its own file 2020-11-23 18:09:29 +00:00
misc.c
net_ns.c rxrpc: Rewrite the client connection manager 2020-09-08 21:11:43 +01:00
output.c rxrpc: Rewrite the client connection manager 2020-09-08 21:11:43 +01:00
peer_event.c treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
peer_object.c rxrpc: Make rxrpc_kernel_get_srtt() indicate validity 2020-08-20 18:21:28 +01:00
proc.c rxrpc: Rewrite the client connection manager 2020-09-08 21:11:43 +01:00
protocol.h
recvmsg.c net: rxrpc: convert comma to semicolon 2020-12-09 16:23:07 -08:00
rtt.c rxrpc: Remove unused macro rxrpc_min_rtt_wlen 2020-09-07 15:04:41 -07:00
rxkad.c rxrpc: Ask the security class how much space to allow in a packet 2020-11-23 19:53:11 +00:00
security.c rxrpc: Hand server key parsing off to the security class 2020-11-23 18:09:29 +00:00
sendmsg.c rxrpc: Ask the security class how much space to allow in a packet 2020-11-23 19:53:11 +00:00
server_key.c rxrpc: Allow security classes to give more info on server keys 2020-11-23 18:09:29 +00:00
skbuff.c
sysctl.c rxrpc: Rewrite the client connection manager 2020-09-08 21:11:43 +01:00
utils.c