umh: fix memory leak on execve failure

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If a UMH process created by fork_usermode_blob() fails to execute,
a pair of struct file allocated by umh_pipe_setup() will leak.

Under normal conditions, the caller (like bpfilter) needs to manage the
lifetime of the UMH and its two pipes. But when fork_usermode_blob()
fails, the caller doesn't really have a way to know what needs to be
done. It seems better to do the cleanup ourselves in this case.

Fixes: 449325b52b ("umh: introduce fork_usermode_blob() helper")
Signed-off-by: Vincent Minet <v.minet@criteo.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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Vincent Minet 2020-05-08 00:14:22 +02:00 • committed by Jakub Kicinski

parent 14d8f7486a

commit db803036ad

1 changed files with 6 additions and 0 deletions

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kernel/umh.c

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