linux-kernel - [PATCH v3 2/5] nvmem: core: verify cell's raw

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Message-Id: <20250104-sar2130p-nvmem-v3-2-a94e0b7de2fa@linaro.org>
Date: Sat, 04 Jan 2025 08:19:13 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>, 
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>
Cc: Akhil P Oommen <quic_akhilpo@...cinc.com>, 
 linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org
Subject: [PATCH v3 2/5] nvmem: core: verify cell's raw_len

Check that the NVMEM cell's raw_len is a aligned to word_size. Otherwise
Otherwise drivers might face incomplete read while accessing the last
part of the NVMEM cell.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
---
 drivers/nvmem/core.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c
index c0af43a37195c3869507a203b370615309aeee67..a03a3006bd611ea6e91703cd19c2842bd4f56659 100644
--- a/drivers/nvmem/core.c
+++ b/drivers/nvmem/core.c
@@ -602,6 +602,14 @@ static int nvmem_cell_info_to_nvmem_cell_entry_nodup(struct nvmem_device *nvmem,
 		return -EINVAL;
 	}
 
+	if (!IS_ALIGNED(cell->raw_len, nvmem->word_size)) {
+		dev_err(&nvmem->dev,
+			"cell %s raw len %zd unaligned to nvmem word size %d\n",
+			cell->name ?: "<unknown>", cell->raw_len,
+			nvmem->word_size);
+		return -EINVAL;
+	}
+
 	return 0;
 }
 

-- 
2.39.5