[PATCH 3.2 22/24] ipv6: fib: fix fib dump restart

From: Ben Hutchings
Date: Tue Mar 03 2015 - 18:26:44 EST


3.2.68-rc1 review patch. If anyone has any objections, please let me know.

------------------

From: Eric Dumazet <edumazet@xxxxxxxxxx>

commit fa809e2fd6e317226c046202a88520962672eac0 upstream.

Commit 2bec5a369ee79576a3 (ipv6: fib: fix crash when changing large fib
while dumping it) introduced ability to restart the dump at tree root,
but failed to skip correctly a count of already dumped entries. Code
didn't match Patrick intent.

We must skip exactly the number of already dumped entries.

Note that like other /proc/net files or netlink producers, we could
still dump some duplicates entries.

Reported-by: Debabrata Banerjee <dbavatar@xxxxxxxxx>
Reported-by: Josh Hunt <johunt@xxxxxxxxxx>
Signed-off-by: Eric Dumazet <edumazet@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
net/ipv6/ip6_fib.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

--- a/net/ipv6/ip6_fib.c
+++ b/net/ipv6/ip6_fib.c
@@ -1276,8 +1276,8 @@ static int fib6_walk_continue(struct fib
if (w->leaf && fn->fn_flags&RTN_RTINFO) {
int err;

- if (w->count < w->skip) {
- w->count++;
+ if (w->skip) {
+ w->skip--;
continue;
}


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