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fde0e672ea
commit 169b803397499be85bdd1e3d07d6f5e3d4bd669e upstream.
the victim might've been rmdir'ed just before the lock_rename();
unlike the normal callers, we do not look the source up after the
parents are locked - we know it beforehand and just recheck that it's
still the child of what used to be its parent. Unfortunately,
the check is too weak - we don't spot a dead directory since its
->d_parent is unchanged, dentry is positive, etc. So we sail all
the way to ->rename(), with hosting filesystems _not_ expecting
to be asked renaming an rmdir'ed subdirectory.
The fix is easy, fortunately - the lock on parent is sufficient for
making IS_DEADDIR() on child safe.
Cc: stable@vger.kernel.org
Fixes:
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.. | ||
bind.c | ||
daemon.c | ||
interface.c | ||
internal.h | ||
Kconfig | ||
key.c | ||
main.c | ||
Makefile | ||
namei.c | ||
proc.c | ||
rdwr.c | ||
security.c | ||
xattr.c |