linux-hardening - [PATCH] tg3: Use slab_build

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Message-Id: <20230818175417.never.273-kees@kernel.org>
Date:   Fri, 18 Aug 2023 10:54:21 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Siva Reddy Kallam <siva.kallam@...adcom.com>
Cc:     Kees Cook <keescook@...omium.org>,
        Fiona Ebner <f.ebner@...xmox.com>,
        Prashant Sreedharan <prashant@...adcom.com>,
        Michael Chan <mchan@...adcom.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Bagas Sanjaya <bagasdotme@...il.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: [PATCH] tg3: Use slab_build_skb() when needed

The tg3 driver will use kmalloc() under some conditions. Check the
frag_size and use slab_build_skb() when frag_size is 0. Silences
the warning introduced by commit ce098da1497c ("skbuff: Introduce
slab_build_skb()"):

	Use slab_build_skb() instead
	...
	tg3_poll_work+0x638/0xf90 [tg3]

Reported-by: Fiona Ebner <f.ebner@...xmox.com>
Closes: https://lore.kernel.org/all/1bd4cb9c-4eb8-3bdb-3e05-8689817242d1@proxmox.com
Cc: Siva Reddy Kallam <siva.kallam@...adcom.com>
Cc: Prashant Sreedharan <prashant@...adcom.com>
Cc: Michael Chan <mchan@...adcom.com>
Cc: "David S. Miller" <davem@...emloft.net>
Cc: Eric Dumazet <edumazet@...gle.com>
Cc: Jakub Kicinski <kuba@...nel.org>
Cc: Paolo Abeni <pabeni@...hat.com>
Cc: Bagas Sanjaya <bagasdotme@...il.com>
Cc: netdev@...r.kernel.org
Signed-off-by: Kees Cook <keescook@...omium.org>
---
 drivers/net/ethernet/broadcom/tg3.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/broadcom/tg3.c b/drivers/net/ethernet/broadcom/tg3.c
index 5ef073a79ce9..cb2810f175cc 100644
--- a/drivers/net/ethernet/broadcom/tg3.c
+++ b/drivers/net/ethernet/broadcom/tg3.c
@@ -6881,7 +6881,10 @@ static int tg3_rx(struct tg3_napi *tnapi, int budget)
 
 			ri->data = NULL;
 
-			skb = build_skb(data, frag_size);
+			if (frag_size)
+				skb = build_skb(data, frag_size);
+			else
+				skb = slab_build_skb(data);
 			if (!skb) {
 				tg3_frag_free(frag_size != 0, data);
 				goto drop_it_no_recycle;
-- 
2.34.1