From 1b7c2dbc07bf0663a41e3dc838992930019f08fd Mon Sep 17 00:00:00 2001 From: James Morris Date: Tue, 31 Oct 2006 00:43:44 -0800 Subject: [PATCH] [IPV6]: fix flowlabel seqfile handling There's a bug in the seqfile show operation for flowlabel objects, where each hash chain is traversed cumulatively for each element. The following function is called for each element of each chain: static void ip6fl_fl_seq_show(struct seq_file *seq, struct ip6_flowlabel *fl) { while(fl) { seq_printf... fl = fl->next; } } Thus, objects can appear mutliple times when reading /proc/net/ip6_flowlabel, as the above is called for each element in the chain. The solution is to remove the while() loop from the above, and traverse each chain exactly once, per the patch below. This also removes the ip6fl_fl_seq_show() function, which does nothing else. Signed-off-by: James Morris Signed-off-by: David S. Miller --- net/ipv6/ip6_flowlabel.c | 18 ++++++------------ 1 file changed, 6 insertions(+), 12 deletions(-) diff --git a/net/ipv6/ip6_flowlabel.c b/net/ipv6/ip6_flowlabel.c index 2b45f2d657c2..6d4533b58dca 100644 --- a/net/ipv6/ip6_flowlabel.c +++ b/net/ipv6/ip6_flowlabel.c @@ -627,9 +627,13 @@ static void ip6fl_seq_stop(struct seq_file *seq, void *v) read_unlock_bh(&ip6_fl_lock); } -static void ip6fl_fl_seq_show(struct seq_file *seq, struct ip6_flowlabel *fl) +static int ip6fl_seq_show(struct seq_file *seq, void *v) { - while(fl) { + if (v == SEQ_START_TOKEN) + seq_printf(seq, "%-5s %-1s %-6s %-6s %-6s %-8s %-32s %s\n", + "Label", "S", "Owner", "Users", "Linger", "Expires", "Dst", "Opt"); + else { + struct ip6_flowlabel *fl = v; seq_printf(seq, "%05X %-1d %-6d %-6d %-6ld %-8ld " NIP6_SEQFMT " %-4d\n", (unsigned)ntohl(fl->label), @@ -640,17 +644,7 @@ static void ip6fl_fl_seq_show(struct seq_file *seq, struct ip6_flowlabel *fl) (long)(fl->expires - jiffies)/HZ, NIP6(fl->dst), fl->opt ? fl->opt->opt_nflen : 0); - fl = fl->next; } -} - -static int ip6fl_seq_show(struct seq_file *seq, void *v) -{ - if (v == SEQ_START_TOKEN) - seq_printf(seq, "%-5s %-1s %-6s %-6s %-6s %-8s %-32s %s\n", - "Label", "S", "Owner", "Users", "Linger", "Expires", "Dst", "Opt"); - else - ip6fl_fl_seq_show(seq, v); return 0; } -- 2.20.1