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| author | Bart Van Assche <bart.vanassche@sandisk.com> | 2017-04-24 15:15:28 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-07-27 15:08:07 -0700 |
| commit | b33da556255ce9703ab06805200bff244697b014 (patch) | |
| tree | 6caf70b716cf23e0500784cfdc7886ff2d51fe9a | |
| parent | a440425194692f9b1d65728615b8599b9b517c0b (diff) | |
| download | linux-stable-b33da556255ce9703ab06805200bff244697b014.tar.gz linux-stable-b33da556255ce9703ab06805200bff244697b014.tar.bz2 linux-stable-b33da556255ce9703ab06805200bff244697b014.zip | |
mlx5: Avoid that mlx5_ib_sg_to_klms() overflows the klms[] array
commit 99975cd4fda52974a767aa44fe0b1a8f74950d9d upstream.
ib_map_mr_sg() can pass an SG-list to .map_mr_sg() that is larger
than what fits into a single MR. .map_mr_sg() must not attempt to
map more SG-list elements than what fits into a single MR.
Hence make sure that mlx5_ib_sg_to_klms() does not write outside
the MR klms[] array.
Fixes: b005d3164713 ("mlx5: Add arbitrary sg list support")
Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Reviewed-by: Max Gurtovoy <maxg@mellanox.com>
Cc: Sagi Grimberg <sagi@grimberg.me>
Cc: Leon Romanovsky <leonro@mellanox.com>
Cc: Israel Rukshin <israelr@mellanox.com>
Acked-by: Leon Romanovsky <leonro@mellanox.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Doug Ledford <dledford@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/infiniband/hw/mlx5/mr.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/infiniband/hw/mlx5/mr.c b/drivers/infiniband/hw/mlx5/mr.c index 1fb31a47966d..0a260a06876d 100644 --- a/drivers/infiniband/hw/mlx5/mr.c +++ b/drivers/infiniband/hw/mlx5/mr.c @@ -1823,7 +1823,7 @@ mlx5_ib_sg_to_klms(struct mlx5_ib_mr *mr, mr->ndescs = sg_nents; for_each_sg(sgl, sg, sg_nents, i) { - if (unlikely(i > mr->max_descs)) + if (unlikely(i >= mr->max_descs)) break; klms[i].va = cpu_to_be64(sg_dma_address(sg) + sg_offset); klms[i].bcount = cpu_to_be32(sg_dma_len(sg) - sg_offset); |