This patch is a part of a series that extends arm64 kernel ABI to allow to
pass tagged user pointers (with the top byte set to something else other
than 0x00) as syscall arguments.
ib_uverbs_(re)reg_mr() use provided user pointers for vma lookups (through
e.g. mlx4_get_umem_mr()), which can only by done with untagged pointers.
Untag user pointers in these functions.
Signed-off-by: Andrey Konovalov <andreyk...@google.com>
---
drivers/infiniband/core/uverbs_cmd.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/infiniband/core/uverbs_cmd.c
b/drivers/infiniband/core/uverbs_cmd.c
index 062a86c04123..36e7b52577d0 100644
--- a/drivers/infiniband/core/uverbs_cmd.c
+++ b/drivers/infiniband/core/uverbs_cmd.c
@@ -708,6 +708,8 @@ static int ib_uverbs_reg_mr(struct uverbs_attr_bundle
*attrs)
if (ret)
return ret;
+ cmd.start = untagged_addr(cmd.start);
+
if ((cmd.start & ~PAGE_MASK) != (cmd.hca_va & ~PAGE_MASK))
return -EINVAL;
@@ -790,6 +792,8 @@ static int ib_uverbs_rereg_mr(struct uverbs_attr_bundle
*attrs)
if (ret)
return ret;
+ cmd.start = untagged_addr(cmd.start);
+
if (cmd.flags & ~IB_MR_REREG_SUPPORTED || !cmd.flags)
return -EINVAL;
--
2.21.0.1020.gf2820cf01a-goog
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