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| author | Vasily Averin <vvs@virtuozzo.com> | 2020-02-25 10:07:12 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-03-18 07:14:20 +0100 |
| commit | 80a12a6f03577de7077a04705b2eeb8078653816 (patch) | |
| tree | cb66fe8856c6955ebb43704eac57666be9829d0c /net | |
| parent | 6fb92c687fba5a534859c07773e3d168c5ae3075 (diff) | |
| download | linux-80a12a6f03577de7077a04705b2eeb8078653816.tar.gz linux-80a12a6f03577de7077a04705b2eeb8078653816.tar.bz2 linux-80a12a6f03577de7077a04705b2eeb8078653816.zip | |
netfilter: x_tables: xt_mttg_seq_next should increase position index
commit ee84f19cbbe9cf7cba2958acb03163fed3ecbb0f upstream.
If .next function does not change position index,
following .show function will repeat output related
to current position index.
Without patch:
# dd if=/proc/net/ip_tables_matches # original file output
conntrack
conntrack
conntrack
recent
recent
icmp
udplite
udp
tcp
0+1 records in
0+1 records out
65 bytes copied, 5.4074e-05 s, 1.2 MB/s
# dd if=/proc/net/ip_tables_matches bs=62 skip=1
dd: /proc/net/ip_tables_matches: cannot skip to specified offset
cp <<< end of last line
tcp <<< and then unexpected whole last line once again
0+1 records in
0+1 records out
7 bytes copied, 0.000102447 s, 68.3 kB/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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net')
| -rw-r--r-- | net/netfilter/x_tables.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/net/netfilter/x_tables.c b/net/netfilter/x_tables.c index 13e1ac333fa4..3bab89dbc371 100644 --- a/net/netfilter/x_tables.c +++ b/net/netfilter/x_tables.c @@ -1556,6 +1556,9 @@ static void *xt_mttg_seq_next(struct seq_file *seq, void *v, loff_t *ppos, uint8_t nfproto = (unsigned long)PDE_DATA(file_inode(seq->file)); struct nf_mttg_trav *trav = seq->private; + if (ppos != NULL) + ++(*ppos); + switch (trav->class) { case MTTG_TRAV_INIT: trav->class = MTTG_TRAV_NFP_UNSPEC; @@ -1581,9 +1584,6 @@ static void *xt_mttg_seq_next(struct seq_file *seq, void *v, loff_t *ppos, default: return NULL; } - - if (ppos != NULL) - ++*ppos; return trav; } |