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linux/net/dccp
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Hangyu Hua a41b17ff9d dccp: put dccp_qpolicy_full() and dccp_qpolicy_push() in the same lock 
In the case of sk->dccps_qpolicy == DCCPQ_POLICY_PRIO, dccp_qpolicy_full
will drop a skb when qpolicy is full. And the lock in dccp_sendmsg is
released before sock_alloc_send_skb and then relocked after
sock_alloc_send_skb. The following conditions may lead dccp_qpolicy_push
to add skb to an already full sk_write_queue:

thread1--->lock
thread1--->dccp_qpolicy_full: queue is full. drop a skb
thread1--->unlock
thread2--->lock
thread2--->dccp_qpolicy_full: queue is not full. no need to drop.
thread2--->unlock
thread1--->lock
thread1--->dccp_qpolicy_push: add a skb. queue is full.
thread1--->unlock
thread2--->lock
thread2--->dccp_qpolicy_push: add a skb!
thread2--->unlock

Fix this by moving dccp_qpolicy_full.

Fixes: b1308dc015 ("[DCCP]: Set TX Queue Length Bounds via Sysctl")
Signed-off-by: Hangyu Hua <hbh25y@gmail.com>
Link: https://lore.kernel.org/r/20220729110027.40569-1-hbh25y@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2022-08-01 12:11:56 -07:00
..
ccids dccp: tfrc: fix doc warnings in tfrc_equation.c 2021-06-10 14:08:49 -07:00
ackvec.c net: dccp: Fix most of the kerneldoc warnings 2020-10-30 12:08:54 -07:00
ackvec.h
ccid.c net: dccp: Add __printf() markup to fix -Wsuggest-attribute=format 2020-10-30 11:31:46 -07:00
ccid.h
dccp.h net: remove noblock parameter from recvmsg() entities 2022-04-12 15:00:25 +02:00
diag.c
feat.c dccp: Return the correct errno code 2021-02-06 11:15:28 -08:00
feat.h
input.c net: dccp: Convert to use the preferred fallthrough macro 2020-08-22 12:38:34 -07:00
ipv4.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2022-05-19 11:23:59 -07:00
ipv6.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2022-05-19 11:23:59 -07:00
ipv6.h
Kconfig
Makefile
minisocks.c tcp: allocate tcp_death_row outside of struct netns_ipv4 2022-01-26 19:00:31 -08:00
options.c net: dccp: Convert to use the preferred fallthrough macro 2020-08-22 12:38:34 -07:00
output.c net: dccp: Fix most of the kerneldoc warnings 2020-10-30 12:08:54 -07:00
proto.c dccp: put dccp_qpolicy_full() and dccp_qpolicy_push() in the same lock 2022-08-01 12:11:56 -07:00
qpolicy.c net: dccp: Fix most of the kerneldoc warnings 2020-10-30 12:08:54 -07:00
sysctl.c
timer.c net: sock: introduce sk_error_report 2021-06-29 11:28:21 -07:00
trace.h net: dccp: Use memset_startat() for TP zeroing 2021-11-19 11:22:49 +00:00