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Yunsheng Lin 0fa32ca438 page_pool: mask the page->signature before the checking 
As mentioned in commit c07aea3ef4 ("mm: add a signature in
struct page"):
"The page->signature field is aliased to page->lru.next and
page->compound_head."

And as the comment in page_is_pfmemalloc():
"lru.next has bit 1 set if the page is allocated from the
pfmemalloc reserves. Callers may simply overwrite it if they
do not need to preserve that information."

The page->signature is OR’ed with PP_SIGNATURE when a page is
allocated in page pool, see __page_pool_alloc_pages_slow(),
and page->signature is checked directly with PP_SIGNATURE in
page_pool_return_skb_page(), which might cause resoure leaking
problem for a page from page pool if bit 1 of lru.next is set
for a pfmemalloc page. What happens here is that the original
pp->signature is OR'ed with PP_SIGNATURE after the allocation
in order to preserve any existing bits(such as the bit 1, used
to indicate a pfmemalloc page), so when those bits are present,
those page is not considered to be from page pool and the DMA
mapping of those pages will be left stale.

As bit 0 is for page->compound_head, So mask both bit 0/1 before
the checking in page_pool_return_skb_page(). And we will return
those pfmemalloc pages back to the page allocator after cleaning
up the DMA mapping.

Fixes: 6a5bcd84e8 ("page_pool: Allow drivers to hint on SKB recycling")
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Signed-off-by: Yunsheng Lin <linyunsheng@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2021-08-09 10:03:02 +01:00
..
6lowpan 6lowpan: Fix some typos in nhc_udp.c 2021-03-24 17:52:11 -07:00
9p 9p/trans_virtio: Fix spelling mistakes 2021-06-02 14:01:55 -07:00
802 net/802/garp: fix memleak in garp_request_join() 2021-07-01 11:21:57 -07:00
8021q net: vlan: pass thru all GSO_SOFTWARE in hw_enc_features 2021-06-18 11:58:03 -07:00
appletalk Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2021-06-18 19:47:02 -07:00
atm atm: Use list_for_each_entry() to simplify code in resources.c 2021-06-10 14:08:09 -07:00
ax25 net/ax25: Delete obsolete TODO file 2021-03-30 16:54:50 -07:00
batman-adv Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2021-06-18 19:47:02 -07:00
bluetooth Bluetooth: defer cleanup of resources in hci_unregister_dev() 2021-08-05 12:15:24 -07:00
bpf bpf, test: fix NULL pointer dereference on invalid expected_attach_type 2021-07-12 17:13:08 +02:00
bpfilter bpfilter: Specify the log level for the kmsg message 2021-06-25 13:13:50 +02:00
bridge Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf 2021-08-06 08:44:50 -07:00
caif net: fix uninit-value in caif_seqpkt_sendmsg 2021-07-15 11:08:33 -07:00
can can: j1939: j1939_xtp_rx_dat_one(): fix rxtimer value between consecutive TP.DT to 750ms 2021-07-24 19:02:24 +02:00
ceph Networking changes for 5.14. 2021-06-30 15:51:09 -07:00
core page_pool: mask the page->signature before the checking 2021-08-09 10:03:02 +01:00
dcb net: dcb: Return the correct errno code 2021-06-01 17:01:33 -07:00
dccp dccp: add do-while-0 stubs for dccp_pr_debug macros 2021-08-09 10:00:02 +01:00
decnet net: decnet: Fix sleeping inside in af_decnet 2021-07-16 14:06:16 -07:00
dns_resolver
dsa net: dsa: tag_ksz: dont let the hardware process the layer 4 checksum 2021-07-21 23:14:49 -07:00
ethernet of: net: pass the dst buffer to of_get_mac_address() 2021-04-13 14:35:02 -07:00
ethtool net: sock: extend SO_TIMESTAMPING for PHC binding 2021-07-01 13:08:18 -07:00
hsr net: hsr: don't check sequence number if tag removal is offloaded 2021-06-16 12:13:01 -07:00
ieee802154 ieee802154: fix error return code in ieee802154_llsec_getparams() 2021-06-03 10:59:49 +02:00
ife
ipv4 net, gro: Set inner transport header offset in tcp/udp GRO hook 2021-08-02 10:20:56 +01:00
ipv6 ipv6: decrease hop limit counter in ip6_forward() 2021-07-23 16:40:41 +01:00
iucv s390: iucv: Avoid field over-reading memcpy() 2021-07-01 15:54:01 -07:00
kcm net: sock: introduce sk_error_report 2021-06-29 11:28:21 -07:00
key net: Remove unnecessary variables 2021-05-26 07:03:39 +02:00
l2tp l2tp: Fix spelling mistakes 2021-06-07 14:08:30 -07:00
l3mdev l3mdev: Correct function names in the kerneldoc comments 2021-03-28 17:56:55 -07:00
lapb net: lapb: Use list_for_each_entry() to simplify code in lapb_iface.c 2021-06-08 16:31:25 -07:00
llc net: llc: fix skb_over_panic 2021-07-27 13:05:56 +01:00
mac80211 mac80211: fix enabling 4-address mode on a sta vif after assoc 2021-07-23 10:34:13 +02:00
mac802154 net: mac802154: Fix general protection fault 2021-04-06 22:42:16 +02:00
mpls mpls: Remove redundant assignment to err 2021-04-27 14:17:00 -07:00
mptcp mptcp: drop unused rcu member in mptcp_pm_addr_entry 2021-08-03 14:26:46 -07:00
ncsi net/ncsi: add dummy response handler for Intel boards 2021-07-08 14:16:39 -07:00
netfilter netfilter: nfnetlink_hook: translate inet ingress to netdev 2021-08-06 17:07:41 +02:00
netlabel netlabel: Fix memory leak in netlbl_mgmt_add_common 2021-06-15 11:19:04 -07:00
netlink net: Use nlmsg_unicast() instead of netlink_unicast() 2021-07-13 09:28:29 -07:00
netrom netrom: Decrease sock refcount when sock timers expire 2021-07-18 09:48:59 -07:00
nfc TTY / Serial patches for 5.14-rc1 2021-07-05 14:08:24 -07:00
nsh
openvswitch openvswitch: Optimize operation for key comparison 2021-07-01 11:13:10 -07:00
packet Networking changes for 5.14. 2021-06-30 15:51:09 -07:00
phonet
psample psample: Add additional metadata attributes 2021-03-14 15:00:43 -07:00
qrtr net: really fix the build... 2021-08-03 11:14:03 +01:00
rds Networking changes for 5.14. 2021-06-30 15:51:09 -07:00
rfkill Another set of updates, all over the map: 2021-04-20 16:44:04 -07:00
rose net: rose: Fix fall-through warnings for Clang 2021-03-10 12:45:15 -08:00
rxrpc Networking changes for 5.14. 2021-06-30 15:51:09 -07:00
sched net: sched: fix lockdep_set_class() typo error for sch->seqlock 2021-08-04 09:59:24 +01:00
sctp sctp: move the active_key update after sh_keys is added 2021-08-03 11:43:43 +01:00
smc net: sock: introduce sk_error_report 2021-06-29 11:28:21 -07:00
strparser net: sock: introduce sk_error_report 2021-06-29 11:28:21 -07:00
sunrpc NFS client updates for Linux 5.14 2021-07-09 09:43:57 -07:00
switchdev net: switchdev: add a context void pointer to struct switchdev_notifier_info 2021-06-28 14:09:03 -07:00
tipc tipc: do not write skb_shinfo frags when doing decrytion 2021-07-24 19:38:21 +01:00
tls Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2021-06-29 15:45:27 -07:00
unix af_unix: fix garbage collect vs MSG_PEEK 2021-07-28 10:18:00 -07:00
vmw_vsock VSOCK: handle VIRTIO_VSOCK_OP_CREDIT_REQUEST 2021-08-03 14:30:59 -07:00
wireless cfg80211: Fix possible memory leak in function cfg80211_bss_update 2021-07-23 10:38:18 +02:00
x25 net: x25: Use list_for_each_entry() to simplify code in x25_route.c 2021-06-10 14:08:09 -07:00
xdp Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2021-06-29 15:45:27 -07:00
xfrm Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/klassert/ipsec 2021-08-04 10:45:41 +01:00
compat.c net: Return the correct errno code 2021-06-03 15:13:56 -07:00
devres.c net: devres: Correct a grammatical error 2021-06-11 12:55:28 -07:00
Kconfig bpf, kconfig: Add consolidated menu entry for bpf with core options 2021-05-11 13:56:16 -07:00
Makefile
socket.c net: socket: support hardware timestamp conversion to PHC bound 2021-07-01 13:08:18 -07:00
sysctl_net.c net: Ensure net namespace isolation of sysctls 2021-04-12 13:27:11 -07:00