IB/core: Avoid unsigned int overflow in sg_alloc_table

commit 3c7ba5760ab8eedec01159b267bb9bfcffe522ac upstream.

sg_alloc_table gets unsigned int as parameter while the driver
returns it as size_t. Check npages isn't greater than maximum
unsigned int.

Fixes: eeb8461e36c9 ("IB: Refactor umem to use linear SG table")
Signed-off-by: Mark Bloch <markb@mellanox.com>
Signed-off-by: Maor Gottlieb <maorg@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Doug Ledford <dledford@redhat.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/drivers/infiniband/core/umem.c b/drivers/infiniband/core/umem.c
index c9fed8f2e0705616d469b985cb987a9731e1d423..7a2b42b6c0859a5c77dc32799dc456b58d9cf843 100644 (file)
--- a/drivers/infiniband/core/umem.c
+++ b/drivers/infiniband/core/umem.c
@@ -156,7 +156,7 @@ struct ib_umem *ib_umem_get(struct ib_ucontext *context, unsigned long addr,
 
        cur_base = addr & PAGE_MASK;
 
-       if (npages == 0) {
+       if (npages == 0 || npages > UINT_MAX) {
                ret = -EINVAL;
                goto out;
        }