3.2.70-rc1 review patch. If anyone has any objections, please let me know.
------------------
From: Yann Droneaud <ydrone...@opteya.com>
commit 66578b0b2f69659f00b6169e6fe7377c4b100d18 upstream.
In a call to ib_umem_get(), if address is 0x0 and size is
already page aligned, check added in commit 8494057ab5e4
("IB/uverbs: Prevent integer overflow in ib_umem_get address
arithmetic") will refuse to register a memory region that
could otherwise be valid (provided vm.mmap_min_addr sysctl
and mmap_low_allowed SELinux knobs allow userspace to map
something at address 0x0).
This patch allows back such registration: ib_umem_get()
should probably don't care of the base address provided it
can be pinned with get_user_pages().
There's two possible overflows, in (addr + size) and in
PAGE_ALIGN(addr + size), this patch keep ensuring none
of them happen while allowing to pin memory at address
0x0. Anyway, the case of size equal 0 is no more (partially)
handled as 0-length memory region are disallowed by an
earlier check.
Link: http://mid.gmane.org/cover.1428929103.git.ydrone...@opteya.com
Cc: Shachar Raindel <rain...@mellanox.com>
Cc: Jack Morgenstein <ja...@mellanox.com>
Cc: Or Gerlitz <ogerl...@mellanox.com>
Signed-off-by: Yann Droneaud <ydrone...@opteya.com>
Reviewed-by: Sagi Grimberg <sa...@mellanox.com>
Reviewed-by: Haggai Eran <hagg...@mellanox.com>
Signed-off-by: Doug Ledford <dledf...@redhat.com>
Signed-off-by: Ben Hutchings <b...@decadent.org.uk>
---
drivers/infiniband/core/umem.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/infiniband/core/umem.c
+++ b/drivers/infiniband/core/umem.c
@@ -101,8 +101,8 @@ struct ib_umem *ib_umem_get(struct ib_uc
* If the combination of the addr and size requested for this memory
* region causes an integer overflow, return error.
*/
- if ((PAGE_ALIGN(addr + size) <= size) ||
- (PAGE_ALIGN(addr + size) <= addr))
+ if (((addr + size) < addr) ||
+ PAGE_ALIGN(addr + size) < (addr + size))
return ERR_PTR(-EINVAL);
if (!can_do_mlock())
--
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