bpf: map_seq_next should always increase position index
[ Upstream commit 90435a7891
]
If seq_file .next fuction does not change position index,
read after some lseek can generate an unexpected output.
See also: https://bugzilla.kernel.org/show_bug.cgi?id=206283
v1 -> v2: removed missed increment in end of function
Signed-off-by: Vasily Averin <vvs@virtuozzo.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/eca84fdd-c374-a154-d874-6c7b55fc3bc4@virtuozzo.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
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@ -196,6 +196,7 @@ static void *map_seq_next(struct seq_file *m, void *v, loff_t *pos)
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void *key = map_iter(m)->key;
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void *prev_key;
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(*pos)++;
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if (map_iter(m)->done)
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return NULL;
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@ -208,8 +209,6 @@ static void *map_seq_next(struct seq_file *m, void *v, loff_t *pos)
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map_iter(m)->done = true;
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return NULL;
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}
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++(*pos);
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return key;
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}
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