[PATCH] IB/ipath: don't allow resources to be created with illegal values

Signed-off-by: Robert Walsh <robert.walsh@qlogic.com>
Signed-off-by: Bryan O'Sullivan <bryan.osullivan@qlogic.com>
Cc: "Michael S. Tsirkin" <mst@mellanox.co.il>
Cc: Roland Dreier <rolandd@cisco.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/infiniband/hw/ipath/ipath_mr.c b/drivers/infiniband/hw/ipath/ipath_mr.c
index 30936769ab3a..4ac31a5da330 100644
--- a/drivers/infiniband/hw/ipath/ipath_mr.c
+++ b/drivers/infiniband/hw/ipath/ipath_mr.c
@@ -170,6 +170,11 @@ struct ib_mr *ipath_reg_user_mr(struct ib_pd *pd, struct ib_umem *region,
         int n, m, i;
         struct ib_mr *ret;
 
+        if (region->length == 0) {
+                ret = ERR_PTR(-EINVAL);
+                goto bail;
+        }
+
         n = 0;
         list_for_each_entry(chunk, &region->chunk_list, list)
                 n += chunk->nents;