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authorAl Viro <viro@zeniv.linux.org.uk>2015-04-24 15:47:07 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2015-04-24 15:52:14 -0400
commit3cab989afd8d8d1bc3d99fef0e7ed87c31e7b647 (patch)
treec696367810e2e603c3156127b6fb0eb4627a7132 /kernel
parentfix I_DIO_WAKEUP definition (diff)
downloadlinux-dev-3cab989afd8d8d1bc3d99fef0e7ed87c31e7b647.tar.xz
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RCU pathwalk breakage when running into a symlink overmounting something
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(). Cc: stable@vger.kernel.org # since 2.6.39 Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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