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xprtrdma: treat all calls not a bcall when bc_serv is NULL
[ Upstream commit 11270e7ca2
]
When a rdma server returns a fault format reply, nfs v3 client may
treats it as a bcall when bc service is not exist.
The debug message at rpcrdma_bc_receive_call are,
[56579.837169] RPC: rpcrdma_bc_receive_call: callback XID
00000001, length=20
[56579.837174] RPC: rpcrdma_bc_receive_call: 00 00 00 01 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 04
After that, rpcrdma_bc_receive_call will meets NULL pointer as,
[ 226.057890] BUG: unable to handle kernel NULL pointer dereference at
00000000000000c8
...
[ 226.058704] RIP: 0010:_raw_spin_lock+0xc/0x20
...
[ 226.059732] Call Trace:
[ 226.059878] rpcrdma_bc_receive_call+0x138/0x327 [rpcrdma]
[ 226.060011] __ib_process_cq+0x89/0x170 [ib_core]
[ 226.060092] ib_cq_poll_work+0x26/0x80 [ib_core]
[ 226.060257] process_one_work+0x1a7/0x360
[ 226.060367] ? create_worker+0x1a0/0x1a0
[ 226.060440] worker_thread+0x30/0x390
[ 226.060500] ? create_worker+0x1a0/0x1a0
[ 226.060574] kthread+0x116/0x130
[ 226.060661] ? kthread_flush_work_fn+0x10/0x10
[ 226.060724] ret_from_fork+0x35/0x40
...
Signed-off-by: Kinglong Mee <kinglongmee@gmail.com>
Reviewed-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
parent
5d3bba6b16
commit
91784f3d77
1 changed files with 5 additions and 0 deletions
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@ -1121,6 +1121,7 @@ static bool
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rpcrdma_is_bcall(struct rpcrdma_xprt *r_xprt, struct rpcrdma_rep *rep)
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#if defined(CONFIG_SUNRPC_BACKCHANNEL)
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{
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struct rpc_xprt *xprt = &r_xprt->rx_xprt;
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struct xdr_stream *xdr = &rep->rr_stream;
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__be32 *p;
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@ -1144,6 +1145,10 @@ rpcrdma_is_bcall(struct rpcrdma_xprt *r_xprt, struct rpcrdma_rep *rep)
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if (*p != cpu_to_be32(RPC_CALL))
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return false;
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/* No bc service. */
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if (xprt->bc_serv == NULL)
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return false;
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/* Now that we are sure this is a backchannel call,
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* advance to the RPC header.
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*/
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