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H A D | namespace.c | 202322e6 Thu Jul 07 19:57:22 CDT 2005 Miklos Szeredi <miklos@szeredi.hu> [PATCH] namespace.c: fix mnt_namespace clearing
This patch clears mnt_namespace on unmount.
Not clearing mnt_namespace has two effects:
1) It is possible to attach a new mount to a detached mount, because check_mnt() returns true.
This means, that when no other references to the detached mount remain, it still can't be freed. This causes a resource leak, and possibly un-removable modules.
2) If mnt_namespace is dereferenced (only in mark_mounts_for_expiry()) after the namspace has been freed, it can cause an Oops, memory corruption, etc.
1) has been tested before and after the patch, 2) is only speculation.
Signed-off-by: Miklos Szeredi <miklos@szeredi.hu> Acked-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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