K 10
svn:author
V 3
kib
K 8
svn:date
V 27
2020-12-17T19:51:39.179661Z
K 7
svn:log
V 424
Fix a race in tty_signal_sessleader() with unlocked read of s_leader.

Since we do not own the session lock, a parallel killjobc() might
reset s_leader to NULL after we checked it.  Read s_leader only once
and ensure that compiler is not allowed to reload.

While there, make access to t_session somewhat more pretty by using
local variable.

PR:	251915
Submitted by:	Jakub Piecuch <j.piecuch96@gmail.com>
MFC after:	1 week

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