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| author | kib <kib@FreeBSD.org> | 2007-12-03 14:02:27 +0000 |
|---|---|---|
| committer | kib <kib@FreeBSD.org> | 2007-12-03 14:02:27 +0000 |
| commit | 4be0c75a36346a1cf37872bbe96d191f17fc43c9 (patch) | |
| tree | 4fa9a4f171731c82febb40c597a5f4368ccf060b /sys/dev/snp | |
| parent | 7d7c31228433aa17ba3a8530ba4e041628e08a50 (diff) | |
| download | FreeBSD-src-4be0c75a36346a1cf37872bbe96d191f17fc43c9.zip FreeBSD-src-4be0c75a36346a1cf37872bbe96d191f17fc43c9.tar.gz | |
Do not allow the SNPSTTY ioctl for the snoop device that has a tty
attached. Otherwise, the snp->snp_tty would be overwritten, while the
tty line discipline still set to the snpdisc. Then snplwrite() causes
panic because ttytosnp() cannot find the snp.
MFC after: 1 week
Diffstat (limited to 'sys/dev/snp')
| -rw-r--r-- | sys/dev/snp/snp.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/sys/dev/snp/snp.c b/sys/dev/snp/snp.c index 08c6c55..2365634 100644 --- a/sys/dev/snp/snp.c +++ b/sys/dev/snp/snp.c @@ -502,6 +502,9 @@ snpioctl(struct cdev *dev, u_long cmd, caddr_t data, int flags, s = *(int *)data; if (s < 0) return (snp_down(snp)); + if (snp->snp_tty != NULL) + return (EBUSY); + if (fget(td, s, &fp) != 0) return (EINVAL); if (fp->f_type != DTYPE_VNODE || |
