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| author | Eric Dumazet <eric.dumazet@gmail.com> | 2009-11-16 02:30:24 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2009-11-16 14:30:35 +0300 |
| commit | 91e9c07bd635353d1a278bdb38dbb56ac371bcb8 (patch) | |
| tree | f208f4e68fdf504fd2039b07c719ca38a2234c61 | |
| parent | e29d4363174949a7a4e46f670993d7ff43342c1c (diff) | |
| download | linux-91e9c07bd635353d1a278bdb38dbb56ac371bcb8.tar.xz | |
net: Fix the rollback test in dev_change_name()
net: Fix the rollback test in dev_change_name()
In dev_change_name() an err variable is used for storing the original
call_netdevice_notifiers() errno (negative) and testing for a rollback
error later, but the test for non-zero is wrong, because the err might
have positive value as well - from dev_alloc_name(). It means the
rollback for a netdevice with a number > 0 will never happen. (The err
test is reordered btw. to make it more readable.)
Signed-off-by: Jarek Poplawski <jarkao2@gmail.com>
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | net/core/dev.c | 11 |
1 files changed, 6 insertions, 5 deletions
diff --git a/net/core/dev.c b/net/core/dev.c index b8f74cfb1bfd..fe10551d3671 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -942,14 +942,15 @@ rollback: ret = notifier_to_errno(ret); if (ret) { - if (err) { - printk(KERN_ERR - "%s: name change rollback failed: %d.\n", - dev->name, ret); - } else { + /* err >= 0 after dev_alloc_name() or stores the first errno */ + if (err >= 0) { err = ret; memcpy(dev->name, oldname, IFNAMSIZ); goto rollback; + } else { + printk(KERN_ERR + "%s: name change rollback failed: %d.\n", + dev->name, ret); } } |