linux-kernel - [PATCH] cxl/pmem: Use size_add() against integer overflow

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Message-Id: <20220927070247.23148-1-yuzhe@nfschina.com>
Date:   Tue, 27 Sep 2022 15:02:47 +0800
From:   Yu Zhe <yuzhe@...china.com>
To:     alison.schofield@...el.com, vishal.l.verma@...el.com,
        ira.weiny@...el.com, bwidawsk@...nel.org, dan.j.williams@...el.com
Cc:     linux-cxl@...r.kernel.org, linux-kernel@...r.kernel.org,
        liqiong@...china.com, kernel-janitors@...r.kernel.org,
        Yu Zhe <yuzhe@...china.com>
Subject: [PATCH] cxl/pmem: Use size_add() against integer overflow

"struct_size() + n" may cause a integer overflow,
use size_add() to handle it.

Signed-off-by: Yu Zhe <yuzhe@...china.com>
---
 drivers/cxl/pmem.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/cxl/pmem.c b/drivers/cxl/pmem.c
index 7dc0a2fa1a6b..8c08aa009a56 100644
--- a/drivers/cxl/pmem.c
+++ b/drivers/cxl/pmem.c
@@ -148,7 +148,7 @@ static int cxl_pmem_set_config_data(struct cxl_dev_state *cxlds,
 		return -EINVAL;
 
 	/* 4-byte status follows the input data in the payload */
-	if (struct_size(cmd, in_buf, cmd->in_length) + 4 > buf_len)
+	if (size_add(struct_size(cmd, in_buf, cmd->in_length), 4) > buf_len)
 		return -EINVAL;
 
 	set_lsa =
-- 
2.11.0