linux-kernel - [PATCH AUTOSEL 5.2 078/123] net/ethernet/qlogic/qed: force the string buffer NULL-terminated

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Date:   Tue, 13 Aug 2019 22:10:02 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Wang Xiayang <xywang.sjtu@...u.edu.cn>,
        "David S . Miller" <davem@...emloft.net>,
        Sasha Levin <sashal@...nel.org>, netdev@...r.kernel.org
Subject: [PATCH AUTOSEL 5.2 078/123] net/ethernet/qlogic/qed: force the string buffer NULL-terminated

From: Wang Xiayang <xywang.sjtu@...u.edu.cn>

[ Upstream commit 3690c8c9a8edff0db077a38783112d8fe12a7dd2 ]

strncpy() does not ensure NULL-termination when the input string
size equals to the destination buffer size 30.
The output string is passed to qed_int_deassertion_aeu_bit()
which calls DP_INFO() and relies NULL-termination.

Use strlcpy instead. The other conditional branch above strncpy()
needs no fix as snprintf() ensures NULL-termination.

This issue is identified by a Coccinelle script.

Signed-off-by: Wang Xiayang <xywang.sjtu@...u.edu.cn>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/ethernet/qlogic/qed/qed_int.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/qlogic/qed/qed_int.c b/drivers/net/ethernet/qlogic/qed/qed_int.c
index fdfedbc8e4311..70a771cd87889 100644
--- a/drivers/net/ethernet/qlogic/qed/qed_int.c
+++ b/drivers/net/ethernet/qlogic/qed/qed_int.c
@@ -1093,7 +1093,7 @@ static int qed_int_deassertion(struct qed_hwfn  *p_hwfn,
 						snprintf(bit_name, 30,
 							 p_aeu->bit_name, num);
 					else
-						strncpy(bit_name,
+						strlcpy(bit_name,
 							p_aeu->bit_name, 30);
 
 					/* We now need to pass bitmask in its
-- 
2.20.1