netdev - [PATCH] bnx2x: fix possible panic under memory stress

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Message-ID: <1403768642.374.5.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Thu, 26 Jun 2014 00:44:02 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	netdev <netdev@...r.kernel.org>,
	Michel Lespinasse <walken@...gle.com>,
	Ariel Elior <ariel.elior@...gic.com>
Subject: [PATCH] bnx2x: fix possible panic under memory stress

From: Eric Dumazet <edumazet@...gle.com>

While it is legal to kfree(NULL), it is not wise to use :
put_page(virt_to_head_page(NULL))

 BUG: unable to handle kernel paging request at ffffeba400000000
 IP: [<ffffffffc01f5928>] virt_to_head_page+0x36/0x44 [bnx2x]

Reported-by: Michel Lespinasse <walken@...gle.com>
Signed-off-by: Eric Dumazet <edumazet@...gle.com>
Cc: Ariel Elior <ariel.elior@...gic.com>
Fixes: d46d132cc021 ("bnx2x: use netdev_alloc_frag()")
---
This is a stable candidate, bug added in linux-3.8

 drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c
index 47c5814114e1..4b875da1c7ed 100644
--- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c
+++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c
@@ -797,7 +797,8 @@ static void bnx2x_tpa_stop(struct bnx2x *bp, struct bnx2x_fastpath *fp,
 
 		return;
 	}
-	bnx2x_frag_free(fp, new_data);
+	if (new_data)
+		bnx2x_frag_free(fp, new_data);
 drop:
 	/* drop the packet and keep the buffer in the bin */
 	DP(NETIF_MSG_RX_STATUS,


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