Patch "netfilter: xt_recent: fix (increase) ipv6 literal buffer length" has been added to the 4.19-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

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

    netfilter: xt_recent: fix (increase) ipv6 literal buffer length

to the 4.19-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-xt_recent-fix-increase-ipv6-literal-buffer.patch
and it can be found in the queue-4.19 subdirectory.

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



commit 7d8c0562c7eeac71e0cb1bc90955fbdb98e5293a
Author: Maciej Żenczykowski <zenczykowski@xxxxxxxxx>
Date:   Sun Nov 5 11:56:00 2023 -0800

    netfilter: xt_recent: fix (increase) ipv6 literal buffer length
    
    [ Upstream commit 7b308feb4fd2d1c06919445c65c8fbf8e9fd1781 ]
    
    in6_pton() supports 'low-32-bit dot-decimal representation'
    (this is useful with DNS64/NAT64 networks for example):
    
      # echo +aaaa:bbbb:cccc:dddd:eeee:ffff:1.2.3.4 > /proc/self/net/xt_recent/DEFAULT
      # cat /proc/self/net/xt_recent/DEFAULT
      src=aaaa:bbbb:cccc:dddd:eeee:ffff:0102:0304 ttl: 0 last_seen: 9733848829 oldest_pkt: 1 9733848829
    
    but the provided buffer is too short:
    
      # echo +aaaa:bbbb:cccc:dddd:eeee:ffff:255.255.255.255 > /proc/self/net/xt_recent/DEFAULT
      -bash: echo: write error: Invalid argument
    
    Fixes: 079aa88fe717 ("netfilter: xt_recent: IPv6 support")
    Signed-off-by: Maciej Żenczykowski <zenczykowski@xxxxxxxxx>
    Reviewed-by: Simon Horman <horms@xxxxxxxxxx>
    Signed-off-by: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/net/netfilter/xt_recent.c b/net/netfilter/xt_recent.c
index cb58bc7ae30d3..2dbf92346a7e5 100644
--- a/net/netfilter/xt_recent.c
+++ b/net/netfilter/xt_recent.c
@@ -566,7 +566,7 @@ recent_mt_proc_write(struct file *file, const char __user *input,
 {
 	struct recent_table *t = PDE_DATA(file_inode(file));
 	struct recent_entry *e;
-	char buf[sizeof("+b335:1d35:1e55:dead:c0de:1715:5afe:c0de")];
+	char buf[sizeof("+b335:1d35:1e55:dead:c0de:1715:255.255.255.255")];
 	const char *c = buf;
 	union nf_inet_addr addr = {};
 	u_int16_t family;