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authorClemens Ladisch <clemens@ladisch.de>2005-10-30 15:03:29 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2005-10-30 17:37:29 -0800
commit9090e6db87e3bdb2a2c187ebc0f9175a9f9e5c6f (patch)
tree46e4a5a27f9d6c694aec2ffba54f90947e8b0477
parent874ec33ff9ccf3651590697a2c2923b911bf31d0 (diff)
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[PATCH] hpet: disallow zero interrupt frequency
Disallow setting an interrupt frequency of zero (which would result in a division by zero), and disallow enabling the interrupt when the frequency hasn't yet been set (which would use an interrupt period of zero). Signed-off-by: Clemens Ladisch <clemens@ladisch.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
-rw-r--r--drivers/char/hpet.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/char/hpet.c b/drivers/char/hpet.c
index c055bb6..b619ca5 100644
--- a/drivers/char/hpet.c
+++ b/drivers/char/hpet.c
@@ -364,6 +364,9 @@ static int hpet_ioctl_ieon(struct hpet_dev *devp)
hpet = devp->hd_hpet;
hpetp = devp->hd_hpets;
+ if (!devp->hd_ireqfreq)
+ return -EIO;
+
v = readq(&timer->hpet_config);
spin_lock_irq(&hpet_lock);
@@ -516,7 +519,7 @@ hpet_ioctl_common(struct hpet_dev *devp, int cmd, unsigned long arg, int kernel)
break;
}
- if (arg & (arg - 1)) {
+ if (!arg || (arg & (arg - 1))) {
err = -EINVAL;
break;
}