tree 1e57529f7af05b88a14ffe4c34daa6aec156abf8
parent a84a2dba946bd49676f5222d49eca8d40346e53c
author Willy Tarreau <w@1wt.eu> 1489578466 +0100
committer Willy Tarreau <w@1wt.eu> 1489578466 +0100
encoding latin1

BUG/MEDIUM: listener: do not try to rebind another process' socket

When the "process" setting of a bind line limits the processes a
listening socket is enabled on, a "disable frontend" operation followed
by an "enable frontend" triggers a bug because all declared listeners
are attempted to be bound again regardless of their assigned processes.
This can at minima create new sockets not receiving traffic, and at worst
prevent from re-enabling a frontend if it's bound to a privileged port.

This bug was introduced by commit 1c4b814 ("MEDIUM: listener: support
rebinding during resume()") merged in 1.6-dev1, trying to perform the
bind() before checking the process list instead of after.

Just move the process check before the bind() operation to fix this.
This fix must be backported to 1.7 and 1.6.

Thanks to Pavlos for reporting this one.