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authorAlan Cox <alan@redhat.com>2008-10-13 10:40:53 +0100
committerLinus Torvalds <torvalds@linux-foundation.org>2008-10-13 09:51:42 -0700
commitdbda4c0b97b18fd59b3964548361b4f92357f730 (patch)
treeca7e2827541aec01762f2a9c0e3155aaf49bf0ca /kernel/acct.c
parent934e6ebf96e8c1a0f299e64129fdaebc1132a427 (diff)
downloadlwn-dbda4c0b97b18fd59b3964548361b4f92357f730.tar.gz
lwn-dbda4c0b97b18fd59b3964548361b4f92357f730.zip
tty: Fix abusers of current->sighand->tty
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 <alan@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/acct.c')
-rw-r--r--kernel/acct.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/acct.c b/kernel/acct.c
index dd68b9059418..f6006a60df5d 100644
--- a/kernel/acct.c
+++ b/kernel/acct.c
@@ -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)));