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Message-ID: <20250402032657.1762800-1-lizhijian@fujitsu.com>
Date: Wed, 2 Apr 2025 11:26:57 +0800
From: Li Zhijian <lizhijian@...itsu.com>
To: linux-rdma@...r.kernel.org
Cc: linux-kernel@...r.kernel.org,
zyjzyj2000@...il.com,
jgg@...pe.ca,
leon@...nel.org,
matsuda-daisuke@...itsu.com,
Shin'ichiro Kawasaki <shinichiro.kawasaki@....com>,
Li Zhijian <lizhijian@...itsu.com>
Subject: [PATCH] RDMA/rxe: Fix null pointer dereference in ODP MR check
The blktests/rnbd reported a null pointer dereference as following.
Similar to the mxl5, introduce a is_odp_mr() to check if the odp
is enabled in this mr.
Workqueue: rxe_wq do_work [rdma_rxe]
RIP: 0010:rxe_mr_copy+0x57/0x210 [rdma_rxe]
Code: 7c 04 48 89 f3 48 89 d5 41 89 cf 45 89 c4 0f 84 dc 00 00 00 89 ca e8 f8 f8 ff ff 85 c0 0f 85 75 01 00 00 49 8b 86 f0 00 00 00 <f6> 40 28 02 0f 85 98 01 00 00 41 8b 46 78 41 8b 8e 10 01 00 00 8d
RSP: 0018:ffffa0aac02cfcf8 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff9079cd440024 RCX: 0000000000000000
RDX: 000000000000003c RSI: ffff9079cd440060 RDI: ffff9079cd665600
RBP: ffff9079c0e5e45a R08: 0000000000000000 R09: 0000000000000000
R10: 000000003c000000 R11: 0000000000225510 R12: 0000000000000000
R13: 0000000000000000 R14: ffff9079cd665600 R15: 000000000000003c
FS: 0000000000000000(0000) GS:ffff907ccfa80000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000028 CR3: 0000000119498001 CR4: 00000000001726f0
Call Trace:
<TASK>
? __die_body+0x1e/0x60
? page_fault_oops+0x14f/0x4c0
? rxe_mr_copy+0x57/0x210 [rdma_rxe]
? search_bpf_extables+0x5f/0x80
? exc_page_fault+0x7e/0x180
? asm_exc_page_fault+0x26/0x30
? rxe_mr_copy+0x57/0x210 [rdma_rxe]
? rxe_mr_copy+0x48/0x210 [rdma_rxe]
? rxe_pool_get_index+0x50/0x90 [rdma_rxe]
rxe_receiver+0x1d98/0x2530 [rdma_rxe]
? psi_task_switch+0x1ff/0x250
? finish_task_switch+0x92/0x2d0
? __schedule+0xbdf/0x17c0
do_task+0x65/0x1e0 [rdma_rxe]
process_scheduled_works+0xaa/0x3f0
worker_thread+0x117/0x240
Fixes: d03fb5c6599e ("RDMA/rxe: Allow registering MRs for On-Demand Paging")
Signed-off-by: Li Zhijian <lizhijian@...itsu.com>
---
drivers/infiniband/sw/rxe/rxe_loc.h | 6 ++++++
drivers/infiniband/sw/rxe/rxe_mr.c | 4 ++--
drivers/infiniband/sw/rxe/rxe_resp.c | 4 ++--
3 files changed, 10 insertions(+), 4 deletions(-)
diff --git a/drivers/infiniband/sw/rxe/rxe_loc.h b/drivers/infiniband/sw/rxe/rxe_loc.h
index feb386d98d1d..0bc3fbb6554f 100644
--- a/drivers/infiniband/sw/rxe/rxe_loc.h
+++ b/drivers/infiniband/sw/rxe/rxe_loc.h
@@ -140,6 +140,12 @@ static inline int qp_mtu(struct rxe_qp *qp)
return IB_MTU_4096;
}
+static inline bool is_odp_mr(struct rxe_mr *mr)
+{
+ return IS_ENABLED(CONFIG_INFINIBAND_ON_DEMAND_PAGING) && mr->umem &&
+ mr->umem->is_odp;
+}
+
void free_rd_atomic_resource(struct resp_res *res);
static inline void rxe_advance_resp_resource(struct rxe_qp *qp)
diff --git a/drivers/infiniband/sw/rxe/rxe_mr.c b/drivers/infiniband/sw/rxe/rxe_mr.c
index 868d2f0b74e9..432d864c3ce9 100644
--- a/drivers/infiniband/sw/rxe/rxe_mr.c
+++ b/drivers/infiniband/sw/rxe/rxe_mr.c
@@ -323,7 +323,7 @@ int rxe_mr_copy(struct rxe_mr *mr, u64 iova, void *addr,
return err;
}
- if (mr->umem->is_odp)
+ if (is_odp_mr(mr))
return rxe_odp_mr_copy(mr, iova, addr, length, dir);
else
return rxe_mr_copy_xarray(mr, iova, addr, length, dir);
@@ -536,7 +536,7 @@ int rxe_mr_do_atomic_write(struct rxe_mr *mr, u64 iova, u64 value)
u64 *va;
/* ODP is not supported right now. WIP. */
- if (mr->umem->is_odp)
+ if (is_odp_mr(mr))
return RESPST_ERR_UNSUPPORTED_OPCODE;
/* See IBA oA19-28 */
diff --git a/drivers/infiniband/sw/rxe/rxe_resp.c b/drivers/infiniband/sw/rxe/rxe_resp.c
index 54ba9ee1acc5..5d9174e408db 100644
--- a/drivers/infiniband/sw/rxe/rxe_resp.c
+++ b/drivers/infiniband/sw/rxe/rxe_resp.c
@@ -650,7 +650,7 @@ static enum resp_states process_flush(struct rxe_qp *qp,
struct resp_res *res = qp->resp.res;
/* ODP is not supported right now. WIP. */
- if (mr->umem->is_odp)
+ if (is_odp_mr(mr))
return RESPST_ERR_UNSUPPORTED_OPCODE;
/* oA19-14, oA19-15 */
@@ -706,7 +706,7 @@ static enum resp_states atomic_reply(struct rxe_qp *qp,
if (!res->replay) {
u64 iova = qp->resp.va + qp->resp.offset;
- if (mr->umem->is_odp)
+ if (is_odp_mr(mr))
err = rxe_odp_atomic_op(mr, iova, pkt->opcode,
atmeth_comp(pkt),
atmeth_swap_add(pkt),
--
2.41.0
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