From e9fc63d682dbbef17921aeb00d03fd52d6735ffd Mon Sep 17 00:00:00 2001 From: Keith Busch Date: Wed, 24 Feb 2016 09:15:58 -0700 Subject: [PATCH] NVMe: Fix 0-length integrity payload A user could send a passthrough IO command with a metadata pointer to a namespace without metadata. With metadata length of 0, kmalloc returns ZERO_SIZE_PTR. Since that is not NULL, the driver would have set this as the bio's integrity payload, which causes an access fault on completion. This patch ignores the users metadata buffer if the namespace format does not support separate metadata. Reported-by: Stephen Bates Signed-off-by: Keith Busch Reviewed-by: Sagi Grimberg Reviewed-by: Christoph Hellwig Reviewed-by: Johannes Thumshirn Signed-off-by: Jens Axboe --- drivers/nvme/host/core.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c index ba15015..470d4f3 100644 --- a/drivers/nvme/host/core.c +++ b/drivers/nvme/host/core.c @@ -184,7 +184,7 @@ int __nvme_submit_user_cmd(struct request_queue *q, struct nvme_command *cmd, goto out_unmap; } - if (meta_buffer) { + if (meta_buffer && meta_len) { struct bio_integrity_payload *bip; meta = kmalloc(meta_len, GFP_KERNEL); -- 2.7.4