linux-kernel - [PATCH 4.18 029/135] net: qualcomm: rmnet: Fix incorrect allocation flag in receive path

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Message-Id: <20181016170517.116720853@linuxfoundation.org>
Date:   Tue, 16 Oct 2018 19:04:19 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Sean Tranchetti <stranche@...eaurora.org>,
        Subash Abhinov Kasiviswanathan <subashab@...eaurora.org>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 4.18 029/135] net: qualcomm: rmnet: Fix incorrect allocation flag in receive path

4.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Subash Abhinov Kasiviswanathan <subashab@...eaurora.org>

[ Upstream commit ec405641e2b73160e26ef17580d0cf28565d146c ]

The incoming skb needs to be reallocated in case the headroom
is not sufficient to adjust the ethernet header. This allocation
needs to be atomic otherwise it results in this splat

 [<600601bb>] ___might_sleep+0x185/0x1a3
 [<603f6314>] ? _raw_spin_unlock_irqrestore+0x0/0x27
 [<60069bb0>] ? __wake_up_common_lock+0x95/0xd1
 [<600602b0>] __might_sleep+0xd7/0xe2
 [<60065598>] ? enqueue_task_fair+0x112/0x209
 [<600eea13>] __kmalloc_track_caller+0x5d/0x124
 [<600ee9b6>] ? __kmalloc_track_caller+0x0/0x124
 [<602696d5>] __kmalloc_reserve.isra.34+0x30/0x7e
 [<603f629b>] ? _raw_spin_lock_irqsave+0x0/0x3d
 [<6026b744>] pskb_expand_head+0xbf/0x310
 [<6025ca6a>] rmnet_rx_handler+0x7e/0x16b
 [<6025c9ec>] ? rmnet_rx_handler+0x0/0x16b
 [<6027ad0c>] __netif_receive_skb_core+0x301/0x96f
 [<60033c17>] ? set_signals+0x0/0x40
 [<6027bbcb>] __netif_receive_skb+0x24/0x8e

Fixes: 74692caf1b0b ("net: qualcomm: rmnet: Process packets over ethernet")
Signed-off-by: Sean Tranchetti <stranche@...eaurora.org>
Signed-off-by: Subash Abhinov Kasiviswanathan <subashab@...eaurora.org>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.c
+++ b/drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.c
@@ -113,7 +113,7 @@ rmnet_map_ingress_handler(struct sk_buff
 	struct sk_buff *skbn;
 
 	if (skb->dev->type == ARPHRD_ETHER) {
-		if (pskb_expand_head(skb, ETH_HLEN, 0, GFP_KERNEL)) {
+		if (pskb_expand_head(skb, ETH_HLEN, 0, GFP_ATOMIC)) {
 			kfree_skb(skb);
 			return;
 		}