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RDMA/rxe: 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: Moni Shoua <monis@mellanox.com>
Signed-off-by: Shiraz Saleem <shiraz.saleem@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
This commit is contained in:
Shiraz Saleem 2019-03-28 11:49:46 -05:00 committed by Jason Gunthorpe
parent 41d34865b2
commit 93923d309b
1 changed files with 1 additions and 1 deletions
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2
drivers/infiniband/sw/rxe/rxe_mr.c
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@ -179,7 +179,7 @@ int rxe_mem_init_user(struct rxe_pd *pd, u64 start,
}
mem->umem = umem;
num_buf = umem->nmap;
num_buf = ib_umem_num_pages(umem);
rxe_mem_init(access, mem);