Patch "netfilter: x_tables: unlock on error in xt_find_table_lock()" has been added to the 4.9-stable tree

Patch "netfilter: x_tables: unlock on error in xt_find_table_lock()" has been added to the 4.9-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    netfilter: x_tables: unlock on error in xt_find_table_lock()

to the 4.9-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     netfilter-x_tables-unlock-on-error-in-xt_find_table_lock.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From foo@baz Thu Mar 22 14:40:23 CET 2018
From: Dan Carpenter <dan.carpenter@oracle.com>
Date: Fri, 28 Apr 2017 15:57:56 +0300
Subject: netfilter: x_tables: unlock on error in xt_find_table_lock()

From: Dan Carpenter <dan.carpenter@oracle.com>


[ Upstream commit 7dde07e9c53617549d67dd3e1d791496d0d3868e ]

According to my static checker we should unlock here before the return.
That seems reasonable to me as well.

Fixes" b9e69e127397 ("netfilter: xtables: don't hook tables by default")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 net/netfilter/x_tables.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/net/netfilter/x_tables.c
+++ b/net/netfilter/x_tables.c
@@ -1006,8 +1006,10 @@ struct xt_table *xt_find_table_lock(stru
 	list_for_each_entry(t, &init_net.xt.tables[af], list) {
 		if (strcmp(t->name, name))
 			continue;
-		if (!try_module_get(t->me))
+		if (!try_module_get(t->me)) {
+			mutex_unlock(&xt[af].mutex);
 			return NULL;
+		}
 
 		mutex_unlock(&xt[af].mutex);
 		if (t->table_init(net) != 0) {


Patches currently in stable-queue which might be from dan.carpenter@oracle.com are

queue-4.9/netfilter-x_tables-unlock-on-error-in-xt_find_table_lock.patch
queue-4.9/asoc-intel-skylake-uninitialized-variable-in-probe_codec.patch
queue-4.9/mmc-host-omap_hsmmc-checking-for-null-instead-of-is_err.patch
queue-4.9/qed-unlock-on-error-in-qed_vf_pf_acquire.patch
queue-4.9/hsi-ssi_protocol-double-free-in-ssip_pn_xmit.patch
queue-4.9/cifs-small-underflow-in-cnvrtdosunixtm.patch
queue-4.9/ib-rdmavt-restore-irqs-on-error-path-in-rvt_create_ah.patch