do_last(): don't let a bogus return value from ->open() et.al. to confuse us

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commit c80567c82a upstream.

... into returning a positive to path_openat(), which would interpret that
as "symlink had been encountered" and proceed to corrupt memory, etc.
It can only happen due to a bug in some ->open() instance or in some LSM
hook, etc., so we report any such event *and* make sure it doesn't trick
us into further unpleasantness.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Al Viro 2016-02-27 19:17:33 -05:00 • committed by Greg Kroah-Hartman

parent f634ac98bd

commit 80d18c0026

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fs/namei.c

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