linux-kernel - [PATCH] net: qed: Fix the use of NULL pointer

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Message-Id: <1636107586-3960637-1-git-send-email-jiasheng@iscas.ac.cn>
Date:   Fri,  5 Nov 2021 10:19:46 +0000
From:   Jiasheng Jiang <jiasheng@...as.ac.cn>
To:     aelior@...vell.com, GR-everest-linux-l2@...vell.com,
        davem@...emloft.net, kuba@...nel.org, ast@...nel.org,
        daniel@...earbox.net, hawk@...nel.org, john.fastabend@...il.com
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        bpf@...r.kernel.org, Jiasheng Jiang <jiasheng@...as.ac.cn>
Subject: [PATCH] net: qed: Fix the use of NULL pointer

If the return value of 'IS_PF(cdev)' is False, then 'p_ptt'
is NULL and the check 'if (IS_PF(cdev) && !p_ptt)' can be
passed through.
Then 'p_ptt' will be used in qed_memcpy_to().
However, 'p_ptt' will be used there, such as 'p_ptt->idx'.
Thus it might be better to fix it.

Fixes: dacd88d ("qed: IOV l2 functionality")
Signed-off-by: Jiasheng Jiang <jiasheng@...as.ac.cn>
---
 drivers/net/ethernet/qlogic/qed/qed_l2.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/qlogic/qed/qed_l2.c b/drivers/net/ethernet/qlogic/qed/qed_l2.c
index dfaf10e..f5ada83 100644
--- a/drivers/net/ethernet/qlogic/qed/qed_l2.c
+++ b/drivers/net/ethernet/qlogic/qed/qed_l2.c
@@ -1932,7 +1932,7 @@ void qed_reset_vport_stats(struct qed_dev *cdev)
 						    : NULL;
 		u32 addr = 0, len = 0;
 
-		if (IS_PF(cdev) && !p_ptt) {
+		if (!p_ptt) {
 			DP_ERR(p_hwfn, "Failed to acquire ptt\n");
 			continue;
 		}
-- 
2.7.4