Fix crda rhbz 1422247

This commit is contained in:
Justin M. Forbes 2017-03-22 15:02:42 -05:00
parent e6f3c5a5cc
commit c73017eaa0
2 changed files with 61 additions and 0 deletions

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@ -0,0 +1,55 @@
From: Stanislaw Gruszka <sgruszka@redhat.com>
Date: 2017-03-22 15:08:33
Subject: [PATCH 4.11] genetlink: fix counting regression on ctrl_dumpfamily()
Commit 2ae0f17df1cd ("genetlink: use idr to track families") replaced
if (++n < fams_to_skip)
continue;
into:
if (n++ < fams_to_skip)
continue;
This subtle change cause that on retry ctrl_dumpfamily() call we omit
one family that failed to do ctrl_fill_info() on previous call, because
cb->args[0] = n number counts also family that failed to do
ctrl_fill_info().
Patch fixes the problem and avoid confusion in the future just decrease
n counter when ctrl_fill_info() fail.
User visible problem caused by this bug is failure to get access to
some genetlink family i.e. nl80211. However problem is reproducible
only if number of registered genetlink families is big enough to
cause second call of ctrl_dumpfamily().
Cc: Xose Vazquez Perez <xose.vazquez@gmail.com>
Cc: Larry Finger <Larry.Finger@lwfinger.net>
Cc: Johannes Berg <johannes@sipsolutions.net>
Fixes: 2ae0f17df1cd ("genetlink: use idr to track families")
Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
---
Dave, please also target this for 4.10+ -stable.
net/netlink/genetlink.c | 4 +++-
1 files changed, 3 insertions(+), 1 deletions(-)
diff --git a/net/netlink/genetlink.c b/net/netlink/genetlink.c
index fb6e10f..92e0981 100644
--- a/net/netlink/genetlink.c
+++ b/net/netlink/genetlink.c
@@ -783,8 +783,10 @@ static int ctrl_dumpfamily(struct sk_buff *skb, struct netlink_callback *cb)
if (ctrl_fill_info(rt, NETLINK_CB(cb->skb).portid,
cb->nlh->nlmsg_seq, NLM_F_MULTI,
- skb, CTRL_CMD_NEWFAMILY) < 0)
+ skb, CTRL_CMD_NEWFAMILY) < 0) {
+ n--;
break;
+ }
}
cb->args[0] = n;
--
1.7.1

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@ -605,6 +605,9 @@ Patch665: netfilter-x_tables-deal-with-bogus-nextoffset-values.patch
# grabbed from mailing list
Patch667: v3-Revert-tty-serial-pl011-add-ttyAMA-for-matching-pl011-console.patch
# Fix crda rhbz 1422247
Patch668: genetlink-fix-counting-regression-on-ctrl_dumpfamily.patch
# END OF PATCH DEFINITIONS
%endif
@ -2169,6 +2172,9 @@ fi
#
#
%changelog
* Wed Mar 22 2017 Justin M. Forbes <jforbes@fedoraproject.org>
- Fix crda (rhbz 1422247)
* Wed Mar 22 2017 Laura Abbott <labbott@fedoraproject.org> - 4.11.0-0.rc3.git1.1
- Linux v4.11-rc3-35-g093b995