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

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... 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.

Cc: stable@vger.kernel.org # v3.6+, at least
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2016-02-27 19:17:33 -05:00
parent 0fcbf996d8
commit c80567c82a
1 changed files with 4 additions and 0 deletions
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4
fs/namei.c
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@ -3273,6 +3273,10 @@ static int do_last(struct nameidata *nd,
goto exit_fput;
}
out:
if (unlikely(error > 0)) {
WARN_ON(1);
error = -EINVAL;
}
if (got_write)
mnt_drop_write(nd->path.mnt);
path_put(&save_parent);