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From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	stable@vger.kernel.org, Kuniyuki Iwashima <kuniyu@amazon.com>,
	"David S. Miller" <davem@davemloft.net>,
	Sasha Levin <sashal@kernel.org>
Subject: [PATCH 4.14 08/37] tcp: Fix a data-race around sysctl_tcp_probe_interval.
Date: Wed, 27 Jul 2022 18:10:34 +0200	[thread overview]
Message-ID: <20220727161001.198867753@linuxfoundation.org> (raw)
In-Reply-To: <20220727161000.822869853@linuxfoundation.org>

From: Kuniyuki Iwashima <kuniyu@amazon.com>

[ Upstream commit 2a85388f1d94a9f8b5a529118a2c5eaa0520d85c ]

While reading sysctl_tcp_probe_interval, it can be changed concurrently.
Thus, we need to add READ_ONCE() to its reader.

Fixes: 05cbc0db03e8 ("ipv4: Create probe timer for tcp PMTU as per RFC4821")
Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 net/ipv4/tcp_output.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index 8ac23e8439c3..5e9b7dfd9d2d 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -2005,7 +2005,7 @@ static inline void tcp_mtu_check_reprobe(struct sock *sk)
 	u32 interval;
 	s32 delta;
 
-	interval = net->ipv4.sysctl_tcp_probe_interval;
+	interval = READ_ONCE(net->ipv4.sysctl_tcp_probe_interval);
 	delta = tcp_jiffies32 - icsk->icsk_mtup.probe_timestamp;
 	if (unlikely(delta >= interval * HZ)) {
 		int mss = tcp_current_mss(sk);
-- 
2.35.1




  parent reply	other threads:[~2022-07-27 16:26 UTC|newest]

Thread overview: 41+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-07-27 16:10 [PATCH 4.14 00/37] 4.14.290-rc1 review Greg Kroah-Hartman
2022-07-27 16:10 ` [PATCH 4.14 01/37] xen/gntdev: Ignore failure to unmap INVALID_GRANT_HANDLE Greg Kroah-Hartman
2022-07-27 16:10 ` [PATCH 4.14 02/37] xfrm: xfrm_policy: fix a possible double xfrm_pols_put() in xfrm_bundle_lookup() Greg Kroah-Hartman
2022-07-27 16:10 ` [PATCH 4.14 03/37] power/reset: arm-versatile: Fix refcount leak in versatile_reboot_probe Greg Kroah-Hartman
2022-07-27 16:10 ` [PATCH 4.14 04/37] perf/core: Fix data race between perf_event_set_output() and perf_mmap_close() Greg Kroah-Hartman
2022-07-27 16:10 ` [PATCH 4.14 05/37] ip: Fix a data-race around sysctl_fwmark_reflect Greg Kroah-Hartman
2022-07-27 16:10 ` [PATCH 4.14 06/37] tcp/dccp: Fix a data-race around sysctl_tcp_fwmark_accept Greg Kroah-Hartman
2022-07-27 16:10 ` [PATCH 4.14 07/37] tcp: Fix a data-race around sysctl_tcp_probe_threshold Greg Kroah-Hartman
2022-07-27 16:10 ` Greg Kroah-Hartman [this message]
2022-07-27 16:10 ` [PATCH 4.14 09/37] i2c: cadence: Change large transfer count reset logic to be unconditional Greg Kroah-Hartman
2022-07-27 16:10 ` [PATCH 4.14 10/37] net: stmmac: fix dma queue left shift overflow issue Greg Kroah-Hartman
2022-07-27 16:10 ` [PATCH 4.14 11/37] igmp: Fix data-races around sysctl_igmp_llm_reports Greg Kroah-Hartman
2022-07-27 16:10 ` [PATCH 4.14 12/37] igmp: Fix a data-race around sysctl_igmp_max_memberships Greg Kroah-Hartman
2022-07-27 16:10 ` [PATCH 4.14 13/37] tcp: Fix a data-race around sysctl_tcp_notsent_lowat Greg Kroah-Hartman
2022-07-27 16:10 ` [PATCH 4.14 14/37] be2net: Fix buffer overflow in be_get_module_eeprom Greg Kroah-Hartman
2022-07-27 16:10 ` [PATCH 4.14 15/37] Revert "Revert "char/random: silence a lockdep splat with printk()"" Greg Kroah-Hartman
2022-07-27 16:10 ` [PATCH 4.14 16/37] mm/mempolicy: fix uninit-value in mpol_rebind_policy() Greg Kroah-Hartman
2022-07-27 16:10 ` [PATCH 4.14 17/37] bpf: Make sure mac_header was set before using it Greg Kroah-Hartman
2022-07-27 16:10 ` [PATCH 4.14 18/37] drm/tilcdc: Remove obsolete crtc_mode_valid() hack Greg Kroah-Hartman
2022-07-27 16:10 ` [PATCH 4.14 19/37] tilcdc: tilcdc_external: fix an incorrect NULL check on list iterator Greg Kroah-Hartman
2022-07-27 16:10 ` [PATCH 4.14 20/37] ALSA: memalloc: Align buffer allocations in page size Greg Kroah-Hartman
2022-07-27 16:10 ` [PATCH 4.14 21/37] Bluetooth: Add bt_skb_sendmsg helper Greg Kroah-Hartman
2022-07-27 16:10 ` [PATCH 4.14 22/37] Bluetooth: Add bt_skb_sendmmsg helper Greg Kroah-Hartman
2022-07-27 16:10 ` [PATCH 4.14 23/37] Bluetooth: SCO: Replace use of memcpy_from_msg with bt_skb_sendmsg Greg Kroah-Hartman
2022-07-27 16:10 ` [PATCH 4.14 24/37] Bluetooth: RFCOMM: Replace use of memcpy_from_msg with bt_skb_sendmmsg Greg Kroah-Hartman
2022-07-27 16:10 ` [PATCH 4.14 25/37] Bluetooth: Fix passing NULL to PTR_ERR Greg Kroah-Hartman
2022-07-27 16:10 ` [PATCH 4.14 26/37] Bluetooth: SCO: Fix sco_send_frame returning skb->len Greg Kroah-Hartman
2022-07-27 16:10 ` [PATCH 4.14 27/37] Bluetooth: Fix bt_skb_sendmmsg not allocating partial chunks Greg Kroah-Hartman
2022-07-27 16:10 ` [PATCH 4.14 28/37] tty: drivers/tty/, stop using tty_schedule_flip() Greg Kroah-Hartman
2022-07-27 16:10 ` [PATCH 4.14 29/37] tty: the rest, " Greg Kroah-Hartman
2022-07-27 16:10 ` [PATCH 4.14 30/37] tty: drop tty_schedule_flip() Greg Kroah-Hartman
2022-07-27 16:10 ` [PATCH 4.14 31/37] tty: extract tty_flip_buffer_commit() from tty_flip_buffer_push() Greg Kroah-Hartman
2022-07-27 16:10 ` [PATCH 4.14 32/37] tty: use new tty_insert_flip_string_and_push_buffer() in pty_write() Greg Kroah-Hartman
2022-07-27 16:10 ` [PATCH 4.14 33/37] net: usb: ax88179_178a needs FLAG_SEND_ZLP Greg Kroah-Hartman
2022-07-27 16:11 ` [PATCH 4.14 34/37] PCI: hv: Fix multi-MSI to allow more than one MSI vector Greg Kroah-Hartman
2022-07-27 16:11 ` [PATCH 4.14 35/37] PCI: hv: Fix hv_arch_irq_unmask() for multi-MSI Greg Kroah-Hartman
2022-07-27 16:11 ` [PATCH 4.14 36/37] PCI: hv: Reuse existing IRTE allocation in compose_msi_msg() Greg Kroah-Hartman
2022-07-27 16:11 ` [PATCH 4.14 37/37] PCI: hv: Fix interrupt mapping for multi-MSI Greg Kroah-Hartman
2022-07-28 10:06 ` [PATCH 4.14 00/37] 4.14.290-rc1 review Naresh Kamboju
2022-07-28 14:32 ` Jon Hunter
2022-07-28 22:57 ` Guenter Roeck

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