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authorVasily Averin <vvs@virtuozzo.com>2020-02-25 10:06:29 +0300
committerPablo Neira Ayuso <pablo@netfilter.org>2020-03-04 04:27:18 +0300
commitdb25517a550926f609c63054b12ea9ad515e1a10 (patch)
treea1878176449ad9ef895f3522defad0790833c870 /net
parentbb71f846a0002239f7058c84f1496648ff4a5c20 (diff)
downloadlinux-db25517a550926f609c63054b12ea9ad515e1a10.tar.xz
netfilter: xt_recent: recent_seq_next should increase position index
If .next function does not change position index, following .show function will repeat output related to current position index. Without the patch: # dd if=/proc/net/xt_recent/SSH # original file outpt src=127.0.0.4 ttl: 0 last_seen: 6275444819 oldest_pkt: 1 6275444819 src=127.0.0.2 ttl: 0 last_seen: 6275438906 oldest_pkt: 1 6275438906 src=127.0.0.3 ttl: 0 last_seen: 6275441953 oldest_pkt: 1 6275441953 0+1 records in 0+1 records out 204 bytes copied, 6.1332e-05 s, 3.3 MB/s Read after lseek into middle of last line (offset 140 in example below) generates expected end of last line and then unexpected whole last line once again # dd if=/proc/net/xt_recent/SSH bs=140 skip=1 dd: /proc/net/xt_recent/SSH: cannot skip to specified offset 127.0.0.3 ttl: 0 last_seen: 6275441953 oldest_pkt: 1 6275441953 src=127.0.0.3 ttl: 0 last_seen: 6275441953 oldest_pkt: 1 6275441953 0+1 records in 0+1 records out 132 bytes copied, 6.2487e-05 s, 2.1 MB/s Cc: stable@vger.kernel.org Fixes: 1f4aace60b0e ("fs/seq_file.c: simplify seq_file iteration code ...") Link: https://bugzilla.kernel.org/show_bug.cgi?id=206283 Signed-off-by: Vasily Averin <vvs@virtuozzo.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'net')
-rw-r--r--net/netfilter/xt_recent.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/net/netfilter/xt_recent.c b/net/netfilter/xt_recent.c
index 0a9708004e20..225a7ab6d79a 100644
--- a/net/netfilter/xt_recent.c
+++ b/net/netfilter/xt_recent.c
@@ -492,12 +492,12 @@ static void *recent_seq_next(struct seq_file *seq, void *v, loff_t *pos)
const struct recent_entry *e = v;
const struct list_head *head = e->list.next;
+ (*pos)++;
while (head == &t->iphash[st->bucket]) {
if (++st->bucket >= ip_list_hash_size)
return NULL;
head = t->iphash[st->bucket].next;
}
- (*pos)++;
return list_entry(head, struct recent_entry, list);
}