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List:       linux-kernel
Subject:    ip_queue_xmit oops in 2.1.17
From:       Richard Henderson <richard () atheist ! tamu ! edu>
Date:       1996-12-31 3:18:02
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Sometime this afternoon my alpha running 2.1.17 dereferenced
a NULL pointer at:

(gdb) l *0xfffffc000036eb90
0xfffffc000036eb90 is in ip_queue_xmit (ip_output.c:366).
361                     kfree_skb(skb, FREE_WRITE);
362                     return;
363             }
364     #endif
365
366             if (skb_headroom(skb) < dev->hard_header_len &&
dev->hard_header) {
367                     struct sk_buff *skb2;
368                     /* ANK: It is almost impossible, but
369                      * if you loaded module device with hh_len >
MAX_HEADER,
370                      * and if a route changed to this device,

in which dev was NULL.  The oops' return address is garbage.

The network devices in use were eth0 and ppp0; the ppp link 
may have just gone down.


r~

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