From: Vasily Averin vvs@virtuozzo.com
stable inclusion from linux-4.19.149 commit f2cd82a26fcf477d593c546d8a84fc7881ceaf27
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[ Upstream commit 1e3f9f073c47bee7c23e77316b07bc12338c5bba ]
if seq_file .next fuction does not change position index, read after some lseek can generate unexpected output.
https://bugzilla.kernel.org/show_bug.cgi?id=206283 Signed-off-by: Vasily Averin vvs@virtuozzo.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Yang Yingliang yangyingliang@huawei.com --- net/core/neighbour.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/net/core/neighbour.c b/net/core/neighbour.c index bf738ec68cb5..6e890f51b7d8 100644 --- a/net/core/neighbour.c +++ b/net/core/neighbour.c @@ -2844,6 +2844,7 @@ static void *neigh_stat_seq_next(struct seq_file *seq, void *v, loff_t *pos) *pos = cpu+1; return per_cpu_ptr(tbl->stats, cpu); } + (*pos)++; return NULL; }