[PATCH v3 1/2] nvme: fix FDP fdpcidx bounds check

[liuxixin]

	<cover.1779930057.git.gliuxen@xxxxxxxxx>
From: liuxixin <gliuxen@xxxxxxxxx>
Date: Thu, 28 May 2026 09:00:36 +0800
Subject: [PATCH v3 1/2] nvme: fix FDP fdpcidx bounds check

The fdpcidx bounds check sets n = NUMFDPC + 1 but used > instead of >=,
incorrectly accepting fdp_idx when it equals n (i.e. NUMFDPC + 1).

Fixes: 30b5f20bb2dd ("nvme: register fdp parameters with the block layer")
Reviewed-by: Nitesh Shetty <nj.shetty@xxxxxxxxxxx>
Signed-off-by: liuxixin <gliuxen@xxxxxxxxx>
---
 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 c3032d6ad..766157ba6 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -2263,7 +2263,7 @@ static int nvme_query_fdp_granularity(struct nvme_ctrl *ctrl,
 	}
 
 	n = le16_to_cpu(h->numfdpc) + 1;
-	if (fdp_idx > n) {
+	if (fdp_idx >= n) {
 		dev_warn(ctrl->device, "FDP index:%d out of range:%d\n",
 			 fdp_idx, n);
 		/* Proceed without registering FDP streams */
-- 
2.43.0