* Coverity: irdma_reg_user_mr(): Integer handling issues
@ 2021-06-08 18:03 coverity-bot
2021-06-15 15:58 ` Saleem, Shiraz
0 siblings, 1 reply; 2+ messages in thread
From: coverity-bot @ 2021-06-08 18:03 UTC (permalink / raw)
To: Mustafa Ismail
Cc: Jason Gunthorpe, Shiraz Saleem, Gustavo A. R. Silva, linux-next
Hello!
This is an experimental semi-automated report about issues detected by
Coverity from a scan of next-20210608 as part of the linux-next scan project:
https://scan.coverity.com/projects/linux-next-weekly-scan
You're getting this email because you were associated with the identified
lines of code (noted below) that were touched by commits:
Wed Jun 2 19:55:18 2021 -0300
b48c24c2d710 ("RDMA/irdma: Implement device supported verb APIs")
Coverity reported the following:
*** CID 1505149: Integer handling issues (DIVIDE_BY_ZERO)
/drivers/infiniband/hw/irdma/verbs.c: 2794 in irdma_reg_user_mr()
2788 SZ_4K | SZ_2M | SZ_1G,
2789 virt);
2790 iwmr->len = region->length;
2791 iwpbl->user_base = virt;
2792 palloc = &iwpbl->pble_alloc;
2793 iwmr->type = req.reg_type;
vvv CID 1505149: Integer handling issues (DIVIDE_BY_ZERO)
vvv In function call "ib_umem_num_dma_blocks", division by expression "iwmr->page_size" which may be zero has undefined behavior.
2794 iwmr->page_cnt = ib_umem_num_dma_blocks(region, iwmr->page_size);
2795
2796 switch (req.reg_type) {
2797 case IRDMA_MEMREG_TYPE_QP:
2798 use_pbles = ((req.sq_pages + req.rq_pages) > 2);
2799 err = irdma_handle_q_mem(iwdev, &req, iwpbl, use_pbles);
If this is a false positive, please let us know so we can mark it as
such, or teach the Coverity rules to be smarter. If not, please make
sure fixes get into linux-next. :) For patches fixing this, please
include these lines (but double-check the "Fixes" first):
Reported-by: coverity-bot <keescook+coverity-bot@chromium.org>
Addresses-Coverity-ID: 1505149 ("Integer handling issues")
Fixes: b48c24c2d710 ("RDMA/irdma: Implement device supported verb APIs")
Thanks for your attention!
--
Coverity-bot
^ permalink raw reply [flat|nested] 2+ messages in thread
* RE: Coverity: irdma_reg_user_mr(): Integer handling issues
2021-06-08 18:03 Coverity: irdma_reg_user_mr(): Integer handling issues coverity-bot
@ 2021-06-15 15:58 ` Saleem, Shiraz
0 siblings, 0 replies; 2+ messages in thread
From: Saleem, Shiraz @ 2021-06-15 15:58 UTC (permalink / raw)
To: coverity-bot, Ismail, Mustafa, Nikolova, Tatyana E
Cc: Jason Gunthorpe, Gustavo A. R. Silva, linux-next
> Subject: Coverity: irdma_reg_user_mr(): Integer handling issues
>
> Hello!
>
> This is an experimental semi-automated report about issues detected by Coverity
> from a scan of next-20210608 as part of the linux-next scan project:
> https://scan.coverity.com/projects/linux-next-weekly-scan
>
> You're getting this email because you were associated with the identified lines of
> code (noted below) that were touched by commits:
>
> Wed Jun 2 19:55:18 2021 -0300
> b48c24c2d710 ("RDMA/irdma: Implement device supported verb APIs")
>
> Coverity reported the following:
>
> *** CID 1505149: Integer handling issues (DIVIDE_BY_ZERO)
> /drivers/infiniband/hw/irdma/verbs.c: 2794 in irdma_reg_user_mr()
> 2788 SZ_4K | SZ_2M |
> SZ_1G,
> 2789 virt);
> 2790 iwmr->len = region->length;
> 2791 iwpbl->user_base = virt;
> 2792 palloc = &iwpbl->pble_alloc;
> 2793 iwmr->type = req.reg_type;
> vvv CID 1505149: Integer handling issues (DIVIDE_BY_ZERO)
> vvv In function call "ib_umem_num_dma_blocks", division by expression "iwmr-
> >page_size" which may be zero has undefined behavior.
> 2794 iwmr->page_cnt = ib_umem_num_dma_blocks(region, iwmr-
> >page_size);
> 2795
> 2796 switch (req.reg_type) {
> 2797 case IRDMA_MEMREG_TYPE_QP:
> 2798 use_pbles = ((req.sq_pages + req.rq_pages) > 2);
> 2799 err = irdma_handle_q_mem(iwdev, &req, iwpbl,
> use_pbles);
>
> If this is a false positive, please let us know so we can mark it as such, or teach
> the Coverity rules to be smarter. If not, please make sure fixes get into linux-next.
> :) For patches fixing this, please include these lines (but double-check the "Fixes"
> first):
>
> Reported-by: coverity-bot <keescook+coverity-bot@chromium.org>
> Addresses-Coverity-ID: 1505149 ("Integer handling issues")
> Fixes: b48c24c2d710 ("RDMA/irdma: Implement device supported verb APIs")
>
> Thanks for your attention!
>
This appears to be a bug. We will send a fix.
Shiraz
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2021-06-08 18:03 Coverity: irdma_reg_user_mr(): Integer handling issues coverity-bot
2021-06-15 15:58 ` Saleem, Shiraz
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