From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
stable@vger.kernel.org, Juergen Gross <jgross@suse.com>,
"David S. Miller" <davem@davemloft.net>
Subject: [PATCH 4.4 07/28] xen/netfront: dont bug in case of too many frags
Date: Thu, 27 Sep 2018 11:06:31 +0200 [thread overview]
Message-ID: <20180927090638.005494355@linuxfoundation.org> (raw)
In-Reply-To: <20180927090637.687829444@linuxfoundation.org>
4.4-stable review patch. If anyone has any objections, please let me know.
------------------
From: Juergen Gross <jgross@suse.com>
commit ad4f15dc2c70b1de5e0a64d27335962fbc9cf71c upstream.
Commit 57f230ab04d291 ("xen/netfront: raise max number of slots in
xennet_get_responses()") raised the max number of allowed slots by one.
This seems to be problematic in some configurations with netback using
a larger MAX_SKB_FRAGS value (e.g. old Linux kernel with MAX_SKB_FRAGS
defined as 18 instead of nowadays 17).
Instead of BUG_ON() in this case just fall back to retransmission.
Fixes: 57f230ab04d291 ("xen/netfront: raise max number of slots in xennet_get_responses()")
Cc: stable@vger.kernel.org
Signed-off-by: Juergen Gross <jgross@suse.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/net/xen-netfront.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
--- a/drivers/net/xen-netfront.c
+++ b/drivers/net/xen-netfront.c
@@ -892,7 +892,11 @@ static RING_IDX xennet_fill_frags(struct
BUG_ON(pull_to <= skb_headlen(skb));
__pskb_pull_tail(skb, pull_to - skb_headlen(skb));
}
- BUG_ON(skb_shinfo(skb)->nr_frags >= MAX_SKB_FRAGS);
+ if (unlikely(skb_shinfo(skb)->nr_frags >= MAX_SKB_FRAGS)) {
+ queue->rx.rsp_cons = ++cons;
+ kfree_skb(nskb);
+ return ~0U;
+ }
skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags,
skb_frag_page(nfrag),
@@ -1029,6 +1033,8 @@ err:
skb->len += rx->status;
i = xennet_fill_frags(queue, skb, &tmpq);
+ if (unlikely(i == ~0U))
+ goto err;
if (rx->flags & XEN_NETRXF_csum_blank)
skb->ip_summed = CHECKSUM_PARTIAL;
next prev parent reply other threads:[~2018-09-27 9:34 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-27 9:06 [PATCH 4.4 00/28] 4.4.159-stable review Greg Kroah-Hartman
2018-09-27 9:06 ` [PATCH 4.4 01/28] NFC: Fix possible memory corruption when handling SHDLC I-Frame commands Greg Kroah-Hartman
2018-09-27 9:06 ` [PATCH 4.4 02/28] NFC: Fix the number of pipes Greg Kroah-Hartman
2018-09-27 9:06 ` [PATCH 4.4 03/28] ASoC: cs4265: fix MMTLR Data switch control Greg Kroah-Hartman
2018-09-27 9:06 ` [PATCH 4.4 04/28] ALSA: bebob: use address returned by kmalloc() instead of kernel stack for streaming DMA mapping Greg Kroah-Hartman
2018-09-27 9:06 ` [PATCH 4.4 05/28] ALSA: emu10k1: fix possible info leak to userspace on SNDRV_EMU10K1_IOCTL_INFO Greg Kroah-Hartman
2018-09-27 9:06 ` [PATCH 4.4 06/28] platform/x86: alienware-wmi: Correct a memory leak Greg Kroah-Hartman
2018-09-27 9:06 ` Greg Kroah-Hartman [this message]
2018-09-27 9:06 ` [PATCH 4.4 08/28] xen/x86/vpmu: Zero struct pt_regs before calling into sample handling code Greg Kroah-Hartman
2018-09-27 9:06 ` [PATCH 4.4 09/28] ring-buffer: Allow for rescheduling when removing pages Greg Kroah-Hartman
2018-09-27 9:06 ` [PATCH 4.4 10/28] mm: shmem.c: Correctly annotate new inodes for lockdep Greg Kroah-Hartman
2018-09-27 9:06 ` [PATCH 4.4 11/28] gso_segment: Reset skb->mac_len after modifying network header Greg Kroah-Hartman
2018-09-27 9:06 ` [PATCH 4.4 12/28] ipv6: fix possible use-after-free in ip6_xmit() Greg Kroah-Hartman
2018-09-27 9:06 ` [PATCH 4.4 13/28] net/appletalk: fix minor pointer leak to userspace in SIOCFINDIPDDPRT Greg Kroah-Hartman
2018-09-27 9:06 ` [PATCH 4.4 14/28] net: hp100: fix always-true check for link up state Greg Kroah-Hartman
2018-09-27 9:06 ` [PATCH 4.4 15/28] neighbour: confirm neigh entries when ARP packet is received Greg Kroah-Hartman
2018-09-27 9:06 ` [PATCH 4.4 16/28] scsi: target: iscsi: Use hex2bin instead of a re-implementation Greg Kroah-Hartman
2018-09-27 9:06 ` [PATCH 4.4 17/28] ocfs2: fix ocfs2 read block panic Greg Kroah-Hartman
2018-09-27 9:06 ` [PATCH 4.4 18/28] drm/nouveau/drm/nouveau: Use pm_runtime_get_noresume() in connector_detect() Greg Kroah-Hartman
2018-09-27 9:06 ` [PATCH 4.4 19/28] tty: vt_ioctl: fix potential Spectre v1 Greg Kroah-Hartman
2018-09-27 9:06 ` [PATCH 4.4 20/28] ext4: avoid divide by zero fault when deleting corrupted inline directories Greg Kroah-Hartman
2018-09-27 9:06 ` [PATCH 4.4 21/28] ext4: recalucate superblock checksum after updating free blocks/inodes Greg Kroah-Hartman
2018-09-27 9:06 ` [PATCH 4.4 22/28] ext4: fix online resizes handling of a too-small final block group Greg Kroah-Hartman
2018-09-27 9:06 ` [PATCH 4.4 23/28] ext4: fix online resizing for bigalloc file systems with a 1k block size Greg Kroah-Hartman
2018-09-27 9:06 ` [PATCH 4.4 24/28] ext4: dont mark mmp buffer head dirty Greg Kroah-Hartman
2018-09-27 9:06 ` [PATCH 4.4 25/28] arm64: Add trace_hardirqs_off annotation in ret_to_user Greg Kroah-Hartman
2018-09-27 9:06 ` [PATCH 4.4 26/28] HID: sony: Update device ids Greg Kroah-Hartman
2018-09-27 9:06 ` [PATCH 4.4 27/28] HID: sony: Support DS4 dongle Greg Kroah-Hartman
2018-09-27 9:06 ` [PATCH 4.4 28/28] iw_cxgb4: only allow 1 flush on user qps Greg Kroah-Hartman
2018-09-27 18:58 ` [PATCH 4.4 00/28] 4.4.159-stable review Nathan Chancellor
2018-09-27 19:47 ` Rafael David Tinoco
2018-09-27 20:19 ` Shuah Khan
2018-09-27 23:05 ` Guenter Roeck
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