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uml: sanity check external data before using it

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Otherwise, a malicious packet could cause a DoS via spurious
out-of-memory failure.

* src/uml/uml_driver.c (umlMonitorCommand): Validate that incoming
data is reliable before using it to allocate/dereference memory.
Don't report bogus errno on short read.
Reported by Jim Meyering.
This commit is contained in:
Eric Blake 2010-03-03 09:31:02 -07:00
parent d0dabc2bf8
commit 582c75ec45
1 changed files with 6 additions and 6 deletions
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12
src/uml/uml_driver.c
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@ -734,15 +734,15 @@ static int umlMonitorCommand(const struct uml_driver *driver,
if (nbytes < 0) {
if (errno == EAGAIN || errno == EINTR)
continue;
virReportSystemError(errno,
_("cannot read reply %s"),
cmd);
virReportSystemError(errno, _("cannot read reply %s"), cmd);
goto error;
}
if (nbytes < sizeof res) {
virReportSystemError(errno,
_("incomplete reply %s"),
cmd);
virReportSystemError(0, _("incomplete reply %s"), cmd);
goto error;
}
if (sizeof res.data < res.length) {
virReportSystemError(0, _("invalid length in reply %s"), cmd);
goto error;
}