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| author | Hillf Danton <dhillf@gmail.com> | 2011-03-31 20:38:47 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-04-19 16:56:03 -0700 |
| commit | c6edc42fe1b5562abae22beabbebd9e557527ae3 (patch) | |
| tree | 757c9373b57ad7ca60925b0aec83bf60d0de953e /drivers/uio/uio.c | |
| parent | f0c554fddd3be561542cd37acdb3adc9ec5483ee (diff) | |
| download | kernel-common-c6edc42fe1b5562abae22beabbebd9e557527ae3.tar.gz kernel-common-c6edc42fe1b5562abae22beabbebd9e557527ae3.tar.bz2 kernel-common-c6edc42fe1b5562abae22beabbebd9e557527ae3.zip | |
uio: fix allocating minor id for uio device
The number of uio devices that could be used should be less than
UIO_MAX_DEVICES by design, and this work guards any cases in which id
more than UIO_MAX_DEVICES is utilized.
Signed-off-by: Hillf Danton <dhillf@gmail.com>
Signed-off-by: Hans J. Koch <hjk@hansjkoch.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/uio/uio.c')
| -rw-r--r-- | drivers/uio/uio.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/drivers/uio/uio.c b/drivers/uio/uio.c index 10a029b24159..d2efe823c20d 100644 --- a/drivers/uio/uio.c +++ b/drivers/uio/uio.c @@ -381,7 +381,13 @@ static int uio_get_minor(struct uio_device *idev) retval = -ENOMEM; goto exit; } - idev->minor = id & MAX_ID_MASK; + if (id < UIO_MAX_DEVICES) { + idev->minor = id; + } else { + dev_err(idev->dev, "too many uio devices\n"); + retval = -EINVAL; + idr_remove(&uio_idr, id); + } exit: mutex_unlock(&minor_lock); return retval; |