Al Viro ebe6976d36 pcm_native: result of put_user() needs to be checked ...

... and no, __put_user() doesn't help here - skipping
access_ok() on the second call does not remove the
possibility of page having become unmapped or r/o
in the meanwhile

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

2020-04-26 09:33:49 -04:00

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