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author | Al Viro <viro@zeniv.linux.org.uk> | 2015-04-24 15:47:07 -0400 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-05-06 21:59:20 +0200 |
commit | 7507c7e11351c4dde218f1bc8bc9fce98329a5fa (patch) | |
tree | 63b1d1946404f0c9c49dfac29b514858b0cc8697 /kernel | |
parent | 07308f3a46406daa58f3ec44f00022538c2e3e23 (diff) |
RCU pathwalk breakage when running into a symlink overmounting something
commit 3cab989afd8d8d1bc3d99fef0e7ed87c31e7b647 upstream.
Calling unlazy_walk() in walk_component() and do_last() when we find
a symlink that needs to be followed doesn't acquire a reference to vfsmount.
That's fine when the symlink is on the same vfsmount as the parent directory
(which is almost always the case), but it's not always true - one _can_
manage to bind a symlink on top of something. And in such cases we end up
with excessive mntput().
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'kernel')
0 files changed, 0 insertions, 0 deletions