tun: Fix races in tun_set_iff

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It is possible for two different tasks with access to the same file
descriptor to call tun_set_iff on it at the same time and race to
attach to a tap device.  Prevent this by placing all of the logic to
attach to a file descriptor in one function and testing the file
descriptor to be certain it is not already attached to another tun
device.

Signed-off-by: Eric W. Biederman <ebiederm@aristanetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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Eric W. Biederman 2009-01-20 10:57:48 +00:00 • committed by David S. Miller

parent 74a3e5a71c

commit a7385ba211

1 changed files with 32 additions and 16 deletions

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48

drivers/net/tun.c

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