Resend - Routing Oops in Kernel 2.2.1

Andreas Steinmetz (ast@domdv.de)
Thu, 18 Feb 1999 22:20:42 +0100

Hi,
first things first: I'm not subscribed to the list so please cc me on replies.
Seems, the last send didn't make it to the list, so here's it again:

Here's what I (accidentally) found out for Linux Kernel 2.2.1:

1. Create a slip interface on pty/tty and configure it with SIOCSIFFLAGS
and friends ioctl() calls (results in new interface sl0)
2. Create a route with RTF_UP|RTF_GATEWAY and member rt_dev=NULL
3. Happily use the interface
4. send SIGINT to the process managing the interface: this causes
the actions as described in the next step(s)
5. Delete route from 2. but accidentally with rt_dev=<uninitialized>
6. shut down sl0 interface using SIOCSIFFLAGS and friends
7. restore pty/tty line discipline

Now somewhere in between 5. to 7. the kernels goes crash boom bang.

My best bet is 5. as rt_dev there points just somewhere and as after
fixing my source the crash didn't happen again.

Could somebody please look into this (it seems that kernel routing
needs a fix)?

Cheers

Andreas Steinmetz

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