bpf: map_seq_next should always increase position index

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[ 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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Vasily Averin 2020-01-25 12:10:02 +03:00 • committed by Greg Kroah-Hartman

parent e37764ca26

commit 1bdfa5900f

1 changed files with 1 additions and 2 deletions

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kernel/bpf/inode.c

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