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Getting rid of sloppy logics:
a) in do_follow_link() we have the wrong vfsmount dropped if our symlink
had been mounted on something. Currently it worls only because we never
get such situation (modulo filesystem playing dirty tricks on us). And
it obfuscates already convoluted logics...
b) same goes for open_namei().
c) in __link_path_walk() we have another "it should never happen" sloppiness -
out_dput: there does double-free on underlying vfsmount and leaks the covering
one if we hit it just after crossing a mountpoint. Again, wrong vfsmount
getting dropped.
d) another too-early-mntput() race - in do_follow_mount() we need to postpone
conditional mntput(path->mnt) until after dput(path->dentry). Again, this one
happens only in it-currently-never-happens-unless-some-fs-plays-dirty
scenario...
Signed-off-by: Al Viro <viro@parcelfarce.linux.theplanet.co.uk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
d9d29a2966