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From: Leon Romanovsky <>
To: Doug Ledford <>, Jason Gunthorpe <>
Cc: Shay Drory <>,
	Krishna Kumar <>,, Sean Hefty <>
Subject: [PATCH rdma-next 2/3] RDMA/core: Fix check of device in rdma_listen()
Date: Sun, 18 Apr 2021 16:55:53 +0300
Message-ID: <> (raw)
In-Reply-To: <>

From: Shay Drory <>

rdma_listen() checks if device already attached to rdma_id_priv,
based on the response the its decide to what to listen, however
this is different when the listeners are canceled.

This leads to a mismatch between rdma_listen() and cma_cancel_operation(),
and causes to bellow wild-memory-access. Fix it by aligning rdma_listen()
according to the cma_cancel_operation().

Found by syzcaller:
BUG: KASAN: wild-memory-access in __list_del include/linux/list.h:112 [inline]
BUG: KASAN: wild-memory-access in __list_del_entry include/linux/list.h:135 [inline]
BUG: KASAN: wild-memory-access in list_del include/linux/list.h:146 [inline]
BUG: KASAN: wild-memory-access in cma_cancel_listens drivers/infiniband/core/cma.c:1767 [inline]
BUG: KASAN: wild-memory-access in cma_cancel_operation drivers/infiniband/core/cma.c:1795 [inline]
BUG: KASAN: wild-memory-access in cma_cancel_operation+0x1f4/0x4b0 drivers/infiniband/core/cma.c:1783
Write of size 8 at addr dead000000000108 by task syz-executor716/334

CPU: 0 PID: 334 Comm: syz-executor716 Not tainted 5.11.0+ #271
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 04/01/2014
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0xbe/0xf9 lib/dump_stack.c:120
 __kasan_report mm/kasan/report.c:400 [inline]
 kasan_report.cold+0x5f/0xd5 mm/kasan/report.c:413
 __list_del include/linux/list.h:112 [inline]
 __list_del_entry include/linux/list.h:135 [inline]
 list_del include/linux/list.h:146 [inline]
 cma_cancel_listens drivers/infiniband/core/cma.c:1767 [inline]
 cma_cancel_operation drivers/infiniband/core/cma.c:1795 [inline]
 cma_cancel_operation+0x1f4/0x4b0 drivers/infiniband/core/cma.c:1783
 _destroy_id+0x29/0x460 drivers/infiniband/core/cma.c:1862
 ucma_close_id+0x36/0x50 drivers/infiniband/core/ucma.c:185
 ucma_destroy_private_ctx+0x58d/0x5b0 drivers/infiniband/core/ucma.c:576
 ucma_close+0x91/0xd0 drivers/infiniband/core/ucma.c:1797
 __fput+0x169/0x540 fs/file_table.c:280
 task_work_run+0xb7/0x100 kernel/task_work.c:140
 exit_task_work include/linux/task_work.h:30 [inline]
 do_exit+0x7da/0x17f0 kernel/exit.c:825
 do_group_exit+0x9e/0x190 kernel/exit.c:922
 __do_sys_exit_group kernel/exit.c:933 [inline]
 __se_sys_exit_group kernel/exit.c:931 [inline]
 __x64_sys_exit_group+0x2d/0x30 kernel/exit.c:931
 do_syscall_64+0x2d/0x40 arch/x86/entry/common.c:46
RIP: 0033:0x44a326
Code: Unable to access opcode bytes at RIP 0x44a2fc.
RSP: 002b:00007ffd14306748 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00000000006c4490 RCX: 000000000044a326
RDX: 0000000000000001 RSI: 000000000000003c RDI: 0000000000000001
RBP: 0000000000000001 R08: 00000000000000e7 R09: ffffffffffffffc0
R10: bb1414ac000000c2 R11: 0000000000000246 R12: 00000000006c4490
R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000001

Fixes: 255d0c14b375 ("RDMA/cma: rdma_bind_addr() leaks a cma_dev reference count")
Signed-off-by: Shay Drory <>
Signed-off-by: Leon Romanovsky <>
 drivers/infiniband/core/cma.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/infiniband/core/cma.c b/drivers/infiniband/core/cma.c
index 2dc302a83014..cc990adaf2b5 100644
--- a/drivers/infiniband/core/cma.c
+++ b/drivers/infiniband/core/cma.c
@@ -3768,7 +3768,7 @@ int rdma_listen(struct rdma_cm_id *id, int backlog)
 	id_priv->backlog = backlog;
-	if (id->device) {
+	if (id_priv->cma_dev) {
 		if (rdma_cap_ib_cm(id->device, 1)) {
 			ret = cma_ib_listen(id_priv);
 			if (ret)

  parent reply index

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-18 13:55 [PATCH rdma-next 0/3] CMA fixes Leon Romanovsky
2021-04-18 13:55 ` [PATCH rdma-next 1/3] RDMA/cma: Skip device which doesn't support CM Leon Romanovsky
2021-04-18 13:55 ` Leon Romanovsky [this message]
2021-04-22 11:28   ` [PATCH rdma-next 2/3] RDMA/core: Fix check of device in rdma_listen() Jason Gunthorpe
2021-04-22 12:44     ` Shay Drory
2021-04-22 12:51       ` Jason Gunthorpe
2021-04-22 13:01         ` Leon Romanovsky
2021-04-22 13:02           ` Jason Gunthorpe
2021-04-22 14:58             ` Leon Romanovsky
2021-04-22 16:18               ` Jason Gunthorpe
2021-04-25 13:17                 ` Leon Romanovsky
2021-04-18 13:55 ` [PATCH rdma-next 3/3] RDMA/core: Add CM to restrack after successful attachment to a device Leon Romanovsky
2021-04-21 23:59 ` [PATCH rdma-next 0/3] CMA fixes Jason Gunthorpe
2021-04-22  6:46   ` Leon Romanovsky

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