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tty: Fix abusers of current->sighand->tty

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Various people outside the tty layer still stick their noses in behind the
scenes. We need to make sure they also obey the locking and referencing rules.

Signed-off-by: Alan Cox <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Alan Cox 2008-10-13 10:40:53 +01:00 • committed by Linus Torvalds
commit dbda4c0b97
2 changed files with 5 additions and 6 deletions
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2
kernel/acct.c
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@ -548,7 +548,7 @@ static void do_acct_process(struct bsd_acct_struct *acct,
#endif
spin_lock_irq(&current->sighand->siglock);
tty = current->signal->tty;
tty = current->signal->tty; /* Safe as we hold the siglock */
ac.ac_tty = tty ? old_encode_dev(tty_devnum(tty)) : 0;
ac.ac_utime = encode_comp_t(jiffies_to_AHZ(cputime_to_jiffies(pacct->ac_utime)));
ac.ac_stime = encode_comp_t(jiffies_to_AHZ(cputime_to_jiffies(pacct->ac_stime)));