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David S. Miller authored
If we don't do that, then the poison value is left in the ->pprev
backlink.

This can cause crashes if we do a disconnect, followed by a connect().

Tested-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
Reported-by: default avatarWen Xu <hotdog3645@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
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