linux-kernel - [PATCH 1/3] nvmem: sprd: Fix memory overflow issue during memcpy operation in efuse driver

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Date:   Fri, 8 Dec 2023 14:11:32 +0800
From:   Yanxin Huang <yanxin.huang@...soc.com>
To:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Orson Zhai <orsonzhai@...il.com>,
        Baolin Wang <baolin.wang@...ux.alibaba.com>,
        Chunyan Zhang <zhang.lyra@...il.com>
CC:     <linux-kernel@...r.kernel.org>,
        huang yanxin <yanxin.huang07@...il.com>,
        Wenming Wu <wenming.wu@...soc.com>
Subject: [PATCH 1/3] nvmem: sprd: Fix memory overflow issue during memcpy operation in efuse driver

The efuse driver didn't determine the size of bytes, resulting in memory
overflow during memcpy operation.

Fixes: 096030e7f449 ("nvmem: sprd: Add Spreadtrum SoCs eFuse support")
Signed-off-by: Yanxin Huang <yanxin.huang@...soc.com>
---
 drivers/nvmem/sprd-efuse.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/nvmem/sprd-efuse.c b/drivers/nvmem/sprd-efuse.c
index bb3105f3291f..24b63620d217 100644
--- a/drivers/nvmem/sprd-efuse.c
+++ b/drivers/nvmem/sprd-efuse.c
@@ -311,6 +311,7 @@ static int sprd_efuse_read(void *context, u32 offset, void *val, size_t bytes)
 	ret = sprd_efuse_raw_read(efuse, index, &data, blk_double);
 	if (!ret) {
 		data >>= blk_offset;
+		bytes = bytes > sizeof(data) ? sizeof(data) : bytes;
 		memcpy(val, &data, bytes);
 	}
 
-- 
2.17.1