[PATCH AUTOSEL 6.0 27/30] cxl/pmem: Use size_add() against integer overflow

[Sasha Levin]

From: Yu Zhe <yuzhe@xxxxxxxxxxxx>

[ Upstream commit 4f1aa35f1fb7d51b125487c835982af792697ecb ]

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

Signed-off-by: Yu Zhe <yuzhe@xxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20220927070247.23148-1-yuzhe@xxxxxxxxxxxx
Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 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 =
-- 
2.35.1