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media: rc: check for integer overflow

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commit 3e45067f94bbd61dec0619b1c32744eb0de480c8 upstream.

The ioctl LIRC_SET_REC_TIMEOUT would set a timeout of 704ns if called
with a timeout of 4294968us.

Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Sean Young 2017-10-08 14:18:52 -04:00 committed by Greg Kroah-Hartman
parent c451af324c
commit bcd2dc9e32
1 changed files with 6 additions and 3 deletions
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9
drivers/media/rc/ir-lirc-codec.c
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@ -286,11 +286,14 @@ static long ir_lirc_ioctl(struct file *filep, unsigned int cmd,
if (!dev->max_timeout)
return -ENOSYS;
/* Check for multiply overflow */
if (val > U32_MAX / 1000)
return -EINVAL;
tmp = val * 1000;
if (tmp < dev->min_timeout ||
tmp > dev->max_timeout)
return -EINVAL;
if (tmp < dev->min_timeout || tmp > dev->max_timeout)
return -EINVAL;
if (dev->s_timeout)
ret = dev->s_timeout(dev, tmp);