https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=195883
Bug ID: 195883
Summary: Incorrect handling of errors in tcp_output() function
Product: Base System
Version: 11.0-CURRENT
Hardware: Any
OS: Any
Status: New
Severity: Affects Many People
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
Created attachment 150466
--> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=150466&action=edit
Suggested patch
Hi,
In the tcp_output() function, nothing is protecting TCP timers from elapsing
during its execution. Under certain conditions a TCP timeout can overlap
if_transmit() and iff the if_transmit() function returns non-zero in that case,
the following repeated check will give a different outcome than previously:
((tp->t_flags & TF_FORCEDATA) == 0 ||
!tcp_timer_active(tp, TT_PERSIST))
This leads up to a panic where the inpcb transmit state gets corrupted.
Suggested solution:
Store outcome from previous check and use that result later on.
--HPS
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