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    SubjectRe: BUG: unable to handle kernel NULL pointer dereference in ipv6_select_ident
    On Thu, Dec 22, 2011 at 05:37:36AM +0100, Eric Dumazet wrote:
    > Le mercredi 21 décembre 2011 à 23:12 +0000, Chris Boot a écrit :
    > >
    > > (gdb) list *ip_fragment+0x9d
    > > 0xffffffff812a62e1 is in ip_fragment (include/net/dst.h:209).
    > > 204 return dst_metric(dst, RTAX_FEATURES) & feature;
    > > 205 }
    > > 206
    > > 207 static inline u32 dst_mtu(const struct dst_entry *dst)
    > > 208 {
    > > 209 return dst->ops->mtu(dst);
    > > 210 }
    > > 211
    > > 212 /* RTT metrics are stored in milliseconds for user ABI, but used as jiffies */
    >
    > This one is different, its not IPv6 related but IPv4 :
    >
    > fake_dst_ops lacks a .mtu() field
    >
    > Bug added in commit 618f9bc74a039da76 (net: Move mtu handling down to
    > the protocol depended handlers)
    >

    Before I did this patch, I changed the .default_mtu field of "struct dst_ops"
    to .mtu and converted all users of default_mtu to mtu. fake_dst_ops never
    had a default_mtu field, so I did not touch it. I guess this bug is arround
    since fake_dst_ops exists. It's now just much easier to trigger as commit
    618f9bc74a039da76 changed dst_mtu() to call dst->ops->mtu() unconditionally.
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