[PATCH v3 1/7] ipv6 addrconf: enable use of proc_dointvec_minmax in addrconf_sysctl
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STALE3673d
From: Maciej Żenczykowski <hidden>
Date: 2016-09-25 10:52:35
Subsystem:
networking [general], networking [ipv4/ipv6], the rest · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, David Ahern, Ido Schimmel, Linus Torvalds
From: Maciej Żenczykowski <redacted> Signed-off-by: Maciej Żenczykowski <redacted> --- net/ipv6/addrconf.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-)
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 2f1f5d439788..11fa1a5564d4 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c@@ -6044,8 +6044,14 @@ static int __addrconf_sysctl_register(struct net *net, char *dev_name, for (i = 0; table[i].data; i++) { table[i].data += (char *)p - (char *)&ipv6_devconf; - table[i].extra1 = idev; /* embedded; no ref */ - table[i].extra2 = net; + /* If one of these is already set, then it is not safe to + * overwrite either of them: this makes proc_dointvec_minmax + * usable. + */ + if (!table[i].extra1 && !table[i].extra2) { + table[i].extra1 = idev; /* embedded; no ref */ + table[i].extra2 = net; + } } snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
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2.8.0.rc3.226.g39d4020