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RDMA/rdmavt: Use correct sizing on buffers holding page DMA addresses 

The buffer that holds the page DMA addresses is sized off umem->nmap.
This can potentially cause out of bound accesses on the PBL array when
iterating the umem DMA-mapped SGL. This is because if umem pages are
combined, umem->nmap can be much lower than the number of system pages
in umem.

Use ib_umem_num_pages() to size this buffer.

Cc: Dennis Dalessandro <dennis.dalessandro@intel.com>
Cc: Mike Marciniszyn <mike.marciniszyn@intel.com>
Cc: Michael J. Ruhl <michael.j.ruhl@intel.com>
Signed-off-by: Shiraz Saleem <shiraz.saleem@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
hifive-unleashed-5.2
Shiraz Saleem 2019-03-28 11:49:47 -05:00 committed by Jason Gunthorpe
parent 93923d309b
commit 629e6f9db6
1 changed files with 1 additions and 1 deletions
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2
drivers/infiniband/sw/rdmavt/mr.c
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@ -392,7 +392,7 @@ struct ib_mr *rvt_reg_user_mr(struct ib_pd *pd, u64 start, u64 length,
if (IS_ERR(umem))
return (void *)umem;
n = umem->nmap;
n = ib_umem_num_pages(umem);
mr = __rvt_alloc_mr(n, pd);
if (IS_ERR(mr)) {