linux-kernel - [PATCH] net: bnx2x: fix variable dereferenced before check

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Message-Id: <20211113223636.11446-1-paskripkin@gmail.com>
Date:   Sun, 14 Nov 2021 01:36:36 +0300
From:   Pavel Skripkin <paskripkin@...il.com>
To:     aelior@...vell.com, skalluru@...vell.com,
        GR-everest-linux-l2@...vell.com, davem@...emloft.net,
        kuba@...nel.org
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Pavel Skripkin <paskripkin@...il.com>
Subject: [PATCH] net: bnx2x: fix variable dereferenced before check

Smatch says:
	bnx2x_init_ops.h:640 bnx2x_ilt_client_mem_op()
	warn: variable dereferenced before check 'ilt' (see line 638)

Move ilt_cli variable initialization _after_ ilt validation, because
it's unsafe to deref the pointer before validation check.

Fixes: 523224a3b3cd ("bnx2x, cnic, bnx2i: use new FW/HSI")
Signed-off-by: Pavel Skripkin <paskripkin@...il.com>
---
 drivers/net/ethernet/broadcom/bnx2x/bnx2x_init_ops.h | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_init_ops.h b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_init_ops.h
index 1835d2e451c0..fc7fce642666 100644
--- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_init_ops.h
+++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_init_ops.h
@@ -635,11 +635,13 @@ static int bnx2x_ilt_client_mem_op(struct bnx2x *bp, int cli_num,
 {
 	int i, rc;
 	struct bnx2x_ilt *ilt = BP_ILT(bp);
-	struct ilt_client_info *ilt_cli = &ilt->clients[cli_num];
+	struct ilt_client_info *ilt_cli;
 
 	if (!ilt || !ilt->lines)
 		return -1;
 
+	ilt_cli = &ilt->clients[cli_num];
+
 	if (ilt_cli->flags & (ILT_CLIENT_SKIP_INIT | ILT_CLIENT_SKIP_MEM))
 		return 0;
 
-- 
2.33.1