* [PATCH] infiniband: core: mad: Fix a sleep-in-atomic-context bug in ib_mad_recv_done()
@ 2018-09-01 12:06 Jia-Ju Bai
2018-09-02 20:32 ` Jason Gunthorpe
0 siblings, 1 reply; 3+ messages in thread
From: Jia-Ju Bai @ 2018-09-01 12:06 UTC (permalink / raw)
To: dledford, jgg, leon, ira.weiny, pravin.shedge4linux, hal, parav,
haakon.bugge, bart.vanassche
Cc: linux-rdma, linux-kernel, Jia-Ju Bai
The driver may sleep with holding a spinlock.
The function call paths (from bottom to top) in Linux-4.16 are:
[FUNC] alloc_mad_private(GFP_KERNEL)
drivers/infiniband/core/mad.c, 2264:
alloc_mad_private in ib_mad_recv_done
drivers/infiniband/core/cq.c, 45:
[FUNC_PTR]ib_mad_recv_done in __ib_process_cq
drivers/infiniband/core/cq.c, 77:
__ib_process_cq in ib_process_cq_direct
drivers/infiniband/ulp/srp/ib_srp.c, 2010:
ib_process_cq_direct in __srp_get_tx_iu
drivers/infiniband/ulp/srp/ib_srp.c, 2353:
__srp_get_tx_iu in srp_queuecommand
drivers/infiniband/ulp/srp/ib_srp.c, 2352:
_raw_spin_lock_irqsave in srp_queuecommand
[FUNC] alloc_mad_private(GFP_KERNEL)
drivers/infiniband/core/mad.c, 2264:
alloc_mad_private in ib_mad_recv_done
drivers/infiniband/core/cq.c, 45:
[FUNC_PTR]ib_mad_recv_done in __ib_process_cq
drivers/infiniband/core/cq.c, 77:
__ib_process_cq in ib_process_cq_direct
drivers/infiniband/ulp/srp/ib_srp.c, 2010:
ib_process_cq_direct in __srp_get_tx_iu
drivers/infiniband/ulp/srp/ib_srp.c, 2903:
__srp_get_tx_iu in srp_send_tsk_mgmt
drivers/infiniband/ulp/srp/ib_srp.c, 2902:
spin_lock_irq in srp_send_tsk_mgmt
To fix this bug, GFP_KERNEL is replaced with GFP_ATOMIC.
This bug is found by my static analysis tool DSAC.
Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com>
---
drivers/infiniband/core/mad.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/infiniband/core/mad.c b/drivers/infiniband/core/mad.c
index f742ae7a768b..0db954f6958a 100644
--- a/drivers/infiniband/core/mad.c
+++ b/drivers/infiniband/core/mad.c
@@ -2263,7 +2263,7 @@ static void ib_mad_recv_done(struct ib_cq *cq, struct ib_wc *wc)
goto out;
mad_size = recv->mad_size;
- response = alloc_mad_private(mad_size, GFP_KERNEL);
+ response = alloc_mad_private(mad_size, GFP_ATOMIC);
if (!response)
goto out;
--
2.17.0
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH] infiniband: core: mad: Fix a sleep-in-atomic-context bug in ib_mad_recv_done()
2018-09-01 12:06 [PATCH] infiniband: core: mad: Fix a sleep-in-atomic-context bug in ib_mad_recv_done() Jia-Ju Bai
@ 2018-09-02 20:32 ` Jason Gunthorpe
2018-09-03 1:41 ` Jia-Ju Bai
0 siblings, 1 reply; 3+ messages in thread
From: Jason Gunthorpe @ 2018-09-02 20:32 UTC (permalink / raw)
To: Jia-Ju Bai
Cc: dledford, leon, ira.weiny, pravin.shedge4linux, hal, parav,
haakon.bugge, bart.vanassche, linux-rdma, linux-kernel
On Sat, Sep 01, 2018 at 08:06:59PM +0800, Jia-Ju Bai wrote:
> The driver may sleep with holding a spinlock.
>
> The function call paths (from bottom to top) in Linux-4.16 are:
>
> [FUNC] alloc_mad_private(GFP_KERNEL)
> drivers/infiniband/core/mad.c, 2264:
> alloc_mad_private in ib_mad_recv_done
> drivers/infiniband/core/cq.c, 45:
> [FUNC_PTR]ib_mad_recv_done in __ib_process_cq
> drivers/infiniband/core/cq.c, 77:
> __ib_process_cq in ib_process_cq_direct
> drivers/infiniband/ulp/srp/ib_srp.c, 2010:
> ib_process_cq_direct in __srp_get_tx_iu
> drivers/infiniband/ulp/srp/ib_srp.c, 2353:
> __srp_get_tx_iu in srp_queuecommand
> drivers/infiniband/ulp/srp/ib_srp.c, 2352:
> _raw_spin_lock_irqsave in srp_queuecommand
>
> [FUNC] alloc_mad_private(GFP_KERNEL)
> drivers/infiniband/core/mad.c, 2264:
> alloc_mad_private in ib_mad_recv_done
> drivers/infiniband/core/cq.c, 45:
> [FUNC_PTR]ib_mad_recv_done in __ib_process_cq
> drivers/infiniband/core/cq.c, 77:
> __ib_process_cq in ib_process_cq_direct
This trace doesn't seem right, the CQ used by SRP will never have
ib_mad_recv_done as a function pointer.
Jason
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH] infiniband: core: mad: Fix a sleep-in-atomic-context bug in ib_mad_recv_done()
2018-09-02 20:32 ` Jason Gunthorpe
@ 2018-09-03 1:41 ` Jia-Ju Bai
0 siblings, 0 replies; 3+ messages in thread
From: Jia-Ju Bai @ 2018-09-03 1:41 UTC (permalink / raw)
To: Jason Gunthorpe
Cc: dledford, leon, ira.weiny, pravin.shedge4linux, hal, parav,
haakon.bugge, bart.vanassche, linux-rdma, linux-kernel
On 2018/9/3 4:32, Jason Gunthorpe wrote:
> On Sat, Sep 01, 2018 at 08:06:59PM +0800, Jia-Ju Bai wrote:
>> The driver may sleep with holding a spinlock.
>>
>> The function call paths (from bottom to top) in Linux-4.16 are:
>>
>> [FUNC] alloc_mad_private(GFP_KERNEL)
>> drivers/infiniband/core/mad.c, 2264:
>> alloc_mad_private in ib_mad_recv_done
>> drivers/infiniband/core/cq.c, 45:
>> [FUNC_PTR]ib_mad_recv_done in __ib_process_cq
>> drivers/infiniband/core/cq.c, 77:
>> __ib_process_cq in ib_process_cq_direct
>> drivers/infiniband/ulp/srp/ib_srp.c, 2010:
>> ib_process_cq_direct in __srp_get_tx_iu
>> drivers/infiniband/ulp/srp/ib_srp.c, 2353:
>> __srp_get_tx_iu in srp_queuecommand
>> drivers/infiniband/ulp/srp/ib_srp.c, 2352:
>> _raw_spin_lock_irqsave in srp_queuecommand
>>
>> [FUNC] alloc_mad_private(GFP_KERNEL)
>> drivers/infiniband/core/mad.c, 2264:
>> alloc_mad_private in ib_mad_recv_done
>> drivers/infiniband/core/cq.c, 45:
>> [FUNC_PTR]ib_mad_recv_done in __ib_process_cq
>> drivers/infiniband/core/cq.c, 77:
>> __ib_process_cq in ib_process_cq_direct
> This trace doesn't seem right, the CQ used by SRP will never have
> ib_mad_recv_done as a function pointer.
Okay, sorry for this false positive.
Best wishes,
Jia-Ju Bai
^ permalink raw reply [flat|nested] 3+ messages in thread
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2018-09-01 12:06 [PATCH] infiniband: core: mad: Fix a sleep-in-atomic-context bug in ib_mad_recv_done() Jia-Ju Bai
2018-09-02 20:32 ` Jason Gunthorpe
2018-09-03 1:41 ` Jia-Ju Bai
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