IB/rxe: Add a runtime check in alloc_index()

Since index values equal to or above 'range' can trigger memory
corruption, complain if index >= range.

Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Reviewed-by: Andrew Boyer <andrew.boyer@dell.com>
Cc: Moni Shoua <monis@mellanox.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

diff --git a/drivers/infiniband/sw/rxe/rxe_pool.c b/drivers/infiniband/sw/rxe/rxe_pool.c
index 7d1e2862b928c1ed5443526111ca54a97f29c0b9..75d11ee635ec2e28ff9278a9b4fb20f2ffc4cdd7 100644 (file)
--- a/drivers/infiniband/sw/rxe/rxe_pool.c
+++ b/drivers/infiniband/sw/rxe/rxe_pool.c
@@ -266,6 +266,7 @@ static u32 alloc_index(struct rxe_pool *pool)
        if (index >= range)
                index = find_first_zero_bit(pool->table, range);
 
+       WARN_ON_ONCE(index >= range);
        set_bit(index, pool->table);
        pool->last = index;
        return index + pool->min_index;