lightnvm: add check after mempool allocation

[ Upstream commit 3bfbc6adbc5031e8a5907baa5beb27b41637742a ]

The mempool allocation might fail. Make sure to return error when it
does, instead of causing a kernel panic.

Signed-off-by: Javier Gonzalez <javier@cnexlabs.com>
Signed-off-by: Matias Bjørling <m@bjorling.me>
Signed-off-by: Jens Axboe <axboe@fb.com>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/lightnvm/rrpc.c b/drivers/lightnvm/rrpc.c
index a1e7488c1f3ea3afe3721f9b04f5a3b6b47a13c6..f4bc98687d7f1acd716c78dc95fa29c114194108 100644 (file)
--- a/drivers/lightnvm/rrpc.c
+++ b/drivers/lightnvm/rrpc.c
@@ -287,6 +287,8 @@ static int rrpc_move_valid_pages(struct rrpc *rrpc, struct rrpc_block *rblk)
        }
 
        page = mempool_alloc(rrpc->page_pool, GFP_NOIO);
+       if (!page)
+               return -ENOMEM;
 
        while ((slot = find_first_zero_bit(rblk->invalid_pages,
                                            nr_pgs_per_blk)) < nr_pgs_per_blk) {