memory leak in rds_send

memory leak in rds_send_probe
Status: upstream: reported C repro on 2019/07/23 16:18
Reported-by: syzbot+5134cdf021c4ed5aaa5f@syzkaller.appspotmail.com
Fix commit: 49bfcbfd989a net: rds: fix memory leak in rds_recvmsg
Patched on: [ci-qemu-upstream ci-qemu-upstream-386 ci-qemu2-arm64 ci-qemu2-arm64-compat ci-qemu2-arm64-mte ci-qemu2-riscv64 ci-upstream-bpf-kasan-gce ci-upstream-bpf-next-kasan-gce ci-upstream-gce-leak ci-upstream-kasan-gce ci-upstream-kasan-gce-386 ci-upstream-kasan-gce-root ci-upstream-kasan-gce-selinux-root ci-upstream-kasan-gce-smack-root ci-upstream-kmsan-gce ci-upstream-kmsan-gce-386 ci-upstream-linux-next-kasan-gce-root ci-upstream-net-kasan-gce ci-upstream-net-this-kasan-gce ci2-upstream-kcsan-gce ci2-upstream-usb], missing on: [ci-qemu2-arm32]
First crash: 737d, last: 194d

Cause bisection: introduced by (bisect log) :
commit af49a63e101eb62376cc1d6bd25b97eb8c691d54
Author: Matthew Wilcox <willy@linux.intel.com>
Date: Sat May 21 00:03:33 2016 +0000

radix-tree: change naming conventions in radix_tree_shrink

Crash: memory leak in next_bio (log)
Repro: C syz .config

Patch testing requests:
Created	Duration	User	Patch	Repo	Result
2021/06/07 16:44	16m	paskripkin@gmail.com	patch	upstream	OK
2021/04/11 07:50	7m	yildirim.fatih@gmail.com	patch	upstream	report log
2021/03/12 15:34	7m	yildirim.fatih@gmail.com		upstream	report log

Sample crash report:

Debian GNU/Linux 9 syzkaller ttyS0
Warning: Permanently added '10.128.0.146' (ECDSA) to the list of known hosts.
executing program
executing program
executing program
BUG: memory leak
unreferenced object 0xffff88810876c200 (size 512):
  comm "syz-executor350", pid 8483, jiffies 4294943292 (age 13.550s)
  hex dump (first 32 bytes):
    01 00 00 00 00 00 00 00 08 c2 76 08 81 88 ff ff  ..........v.....
    08 c2 76 08 81 88 ff ff 18 c2 76 08 81 88 ff ff  ..v.......v.....
  backtrace:
    [<00000000fbb10817>] kmalloc include/linux/slab.h:557 [inline]
    [<00000000fbb10817>] kzalloc include/linux/slab.h:682 [inline]
    [<00000000fbb10817>] rds_message_alloc+0x40/0xc0 net/rds/message.c:291
    [<000000001ac198e5>] rds_send_probe.constprop.0+0x42/0x3e0 net/rds/send.c:1434
    [<000000001bd1f2fa>] rds_recv_incoming+0x252/0x690 net/rds/recv.c:343
    [<00000000c65e3d21>] rds_loop_xmit+0xa3/0x120 net/rds/loop.c:96
    [<00000000ce7b6654>] rds_send_xmit+0x763/0xe20 net/rds/send.c:367
    [<00000000814997e7>] rds_sendmsg+0x16cd/0x1970 net/rds/send.c:1382
    [<0000000002df8577>] sock_sendmsg_nosec net/socket.c:652 [inline]
    [<0000000002df8577>] sock_sendmsg+0x56/0x80 net/socket.c:672
    [<000000004b22eb26>] __sys_sendto+0x15c/0x200 net/socket.c:1975
    [<000000005452504a>] __do_sys_sendto net/socket.c:1987 [inline]
    [<000000005452504a>] __se_sys_sendto net/socket.c:1983 [inline]
    [<000000005452504a>] __x64_sys_sendto+0x26/0x30 net/socket.c:1983
    [<000000007167884c>] do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
    [<0000000073d9f733>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

Crashes (27):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro
ci-upstream-gce-leak	2021/01/16 03:16	upstream	5ee88057889b	65a7a854	.config	log	report	syz	C
ci-upstream-gce-leak	2021/01/01 14:21	upstream	f6e1ea196492	79264ae3	.config	log	report	syz	C
ci-upstream-gce-leak	2020/11/30 16:50	upstream	b65054597872	78d50c1d	.config	log	report	syz	C
ci-upstream-gce-leak	2020/09/04 00:36	upstream	e28f0104343d	abf9ba4f	.config	log	report	syz	C
ci-upstream-gce-leak	2020/07/04 10:30	upstream	7cc2a8ea1048	51095195	.config	log	report	syz	C
ci-upstream-gce-leak	2020/05/17 00:44	upstream	3d1c1e5931ce	37bccd4e	.config	log	report	syz	C
ci-upstream-gce-leak	2020/04/07 14:55	upstream	7e63420847ae	99a96044	.config	log	report	syz	C
ci-upstream-gce-leak	2020/03/19 05:48	upstream	5076190daded	0a96a13c	.config	log	report	syz	C
ci-upstream-gce-leak	2020/03/17 11:57	upstream	fb33c6510d55	749688d2	.config	log	report	syz	C
ci-upstream-gce-leak	2020/03/14 11:24	upstream	fffb08b37df9	749688d2	.config	log	report	syz	C
ci-upstream-gce-leak	2020/03/12 16:49	upstream	e6e6ec48dd0f	d850e9d0	.config	log	report	syz	C
ci-upstream-gce-leak	2020/03/03 06:42	upstream	63623fd44972	c88c7b75	.config	log	report	syz	C
ci-upstream-gce-leak	2020/02/26 17:06	upstream	f8788d86ab28	59b57593	.config	log	report	syz	C
ci-upstream-gce-leak	2020/02/08 06:01	upstream	41dcd67e8868	06150bf1	.config	log	report	syz	C
ci-upstream-gce-leak	2020/01/31 11:16	upstream	9f68e3655aae	5ed23f9a	.config	log	report	syz	C
ci-upstream-gce-leak	2020/01/25 03:15	upstream	6381b442836e	2e95ab33	.config	log	report	syz	C
ci-upstream-gce-leak	2020/01/10 21:15	upstream	e69ec487b2c7	4de4e9f0	.config	log	report	syz	C
ci-upstream-gce-leak	2020/01/10 18:38	upstream	e69ec487b2c7	4de4e9f0	.config	log	report	syz	C
ci-upstream-gce-leak	2019/12/26 13:03	upstream	46cf053efec6	be5c2c81	.config	log	report	syz	C
ci-upstream-gce-leak	2019/10/31 17:51	upstream	e472c64aa4fa	a41ca8fa	.config	log	report	syz	C
ci-upstream-gce-leak	2019/10/11 11:43	upstream	9e208aa06c21	1a3bad90	.config	log	report	syz	C
ci-upstream-gce-leak	2019/10/04 07:32	upstream	cc3a7bfe62b9	fc17ba49	.config	log	report	syz	C
ci-upstream-gce-leak	2019/10/04 06:54	upstream	cc3a7bfe62b9	fc17ba49	.config	log	report	syz	C
ci-upstream-gce-leak	2019/09/03 20:25	upstream	089cf7f6ecb2	48448e71	.config	log	report	syz	C
ci-upstream-gce-leak	2019/08/28 01:16	upstream	6525771f58cb	fd37b39e	.config	log	report	syz	C
ci-upstream-gce-leak	2019/07/23 11:19	upstream	c6dd78fcb8ee	55e0c077	.config	log	report	syz	C
ci-upstream-gce-leak	2020/04/10 23:16	upstream	c0cc271173b2	a8c6a3f8	.config	log	report	syz