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Alexander Ovechkin 1b86e26f2f tcp: relookup sock for RST+ACK packets handled by obsolete req sock 
[ Upstream commit 7233da86697efef41288f8b713c10c2499cffe85 ]

Currently tcp_check_req can be called with obsolete req socket for which big
socket have been already created (because of CPU race or early demux
assigning req socket to multiple packets in gro batch).

Commit e0f9759f530bf789e984 ("tcp: try to keep packet if SYN_RCV race
is lost") added retry in case when tcp_check_req is called for PSH|ACK packet.
But if client sends RST+ACK immediatly after connection being
established (it is performing healthcheck, for example) retry does not
occur. In that case tcp_check_req tries to close req socket,
leaving big socket active.

Fixes: e0f9759f530 ("tcp: try to keep packet if SYN_RCV race is lost")
Signed-off-by: Alexander Ovechkin <ovov@yandex-team.ru>
Reported-by: Oleg Senin <olegsenin@yandex-team.ru>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
 		2021-04-12 12:53:28 +08:00
..
acpi ACPICA: Fix exception code class checks 2021-04-12 12:52:13 +08:00
asm-generic vmlinux.lds.h: add DWARF v5 sections 2021-04-12 12:52:10 +08:00
clocksource Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
crypto crypto: x86 - Regularize glue function prototypes 2021-04-12 12:53:14 +08:00
drm iommu/vt-d: Move intel_iommu_gfx_mapped to Intel IOMMU header 2021-03-16 16:41:21 +08:00
dt-bindings Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
keys KEYS: Don't write out to userspace while holding key semaphore 2021-03-16 16:26:42 +08:00
kvm Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
linux macvlan: macvlan_count_rx() needs to be aware of preemption 2021-04-12 12:53:27 +08:00
math-emu Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
media media: rc: compile rc-cec.c into rc-core 2021-04-12 12:53:01 +08:00
misc Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
net tcp: relookup sock for RST+ACK packets handled by obsolete req sock 2021-04-12 12:53:28 +08:00
pcmcia Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
ras Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
rdma RDMA/umem: Fix signature of stub ib_umem_find_best_pgsz() 2021-03-16 16:38:49 +08:00
scsi scsi: libiscsi: Fix NOP race condition 2021-03-16 16:41:40 +08:00
soc irqchip/eznps: Fix build error for !ARC700 builds 2021-03-16 16:35:56 +08:00
sound ALSA: hda: intel-nhlt: verify config type 2021-04-12 12:52:52 +08:00
target scsi: target: core: Add cmd length set before cmd complete 2021-04-12 12:53:04 +08:00
trace writeback: Drop I_DIRTY_TIME_EXPIRE 2021-04-12 12:51:42 +08:00
uapi USB: replace hardcode maximum usb string length by definition 2021-04-12 12:53:18 +08:00
vdso Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
video Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
xen Xen/gntdev: correct error checking in gntdev_map_grant_pages() 2021-04-12 12:52:07 +08:00